Patent Publication Number: US-2022217425-A1

Title: Call audio playback speed adjustment

Description:
The present disclosure is generally related to adjustment of call audio playback speed. 
     I. DESCRIPTION OF RELATED ART 
     Advances in technology have resulted in smaller and more powerful computing devices. For example, there currently exist a variety of portable personal computing devices, including wireless telephones such as mobile and smart phones, tablets and laptop computers that are small, lightweight, and easily carried by users. These devices can communicate voice and data packets over wireless networks. Further, many such devices incorporate additional functionality such as a digital still camera, a digital video camera, a digital recorder, and an audio file player. Also, such devices can process executable instructions, including software applications, such as a web browser application, that can be used to access the Internet. As such, these devices can include significant computing capabilities. 
     Such computing devices often incorporate functionality to receive an audio signal from one or more microphones. For example, the audio signal may represent user speech captured by the microphones, external sounds captured by the microphones, or a combination thereof. Such devices may include communication devices for making calls, such as audio calls or video calls. Network issues during a call between a first user and a second user can cause frame loss such that some audio frames sent by a first device of the first user are not received by a second device of the second user. In some examples, the audio frames are received by the second device but the second user is temporarily unavailable (e.g., has to step away) and misses part of the call. The second user has to guess what was missed or ask the first user to repeat what was missed, which adversely impacts user experience. 
     II. SUMMARY 
     According to one implementation of the present disclosure, a device for communication includes one or more processors configured to, during a call, receive a sequence of audio frames from a first device. The one or more processors are also configured to, in response to determining that no audio frame of the sequence has been received for a threshold duration since a last received audio frame of the sequence, initiate transmission of a frame loss indication to the first device. The one or more processors are further configured to, responsive to the frame loss indication, receive a set of audio frames of the sequence and an indication of a second playback speed from the first device. The one or more processors are also configured to initiate playback, via a speaker, of the set of audio frames based on the second playback speed. The second playback speed is greater than a first playback speed of a first set of audio frames of the sequence. 
     According to another implementation of the present disclosure, a method of communication includes, during a call, receiving, at a device, a sequence of audio frames from a first device. The method also includes, in response to determining that no audio frame of the sequence has been received at the device for a threshold duration since a last received audio frame of the sequence, initiating transmission of a frame loss indication from the device to the first device. The method further includes, responsive to the frame loss indication, receiving, at the device, a set of audio frames of the sequence and an indication of a second playback speed from the first device. The method also includes initiating playback, via a speaker, of the set of audio frames based on the second playback speed, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     According to another implementation of the present disclosure, a device for communication includes one or more processors configured to, during a call, receive a sequence of audio frames from a first device. The one or more processors are also configured to, in response to receiving a user request to resume playback and determining that a set of audio frames that is subsequent to a last played audio frame in the sequence is available, initiate playback of the set of audio frames based on a second playback speed, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     According to another implementation of the present disclosure, a method of communication includes receiving, at a device, a sequence of audio frames from a first device. The method also includes, in response to receiving a user request to resume playback and determining that a set of audio frames that is subsequent to a last played audio frame in the sequence is available, initiating playback at the device of the set of audio frames at least at a second playback speed. The second playback speed is greater than a first playback speed of a first set of audio frames of the sequence. 
     Other aspects, advantages, and features of the present disclosure will become apparent after review of the entire application, including the following sections: Brief Description of the Drawings, Detailed Description, and the Claims. 
    
    
     
       III. BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram of a particular illustrative aspect of a system operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 2  is a diagram of an illustrative aspect of a system operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 3  is a diagram of an illustrative aspect of a system operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 4  is a ladder diagram of an illustrative aspect of operation of components of any of the systems of  FIGS. 1 to 3 , in accordance with some examples of the present disclosure. 
         FIG. 5  is a diagram of an illustrative aspect of operation of components of any of the systems of  FIGS. 1 to 3 , in accordance with some examples of the present disclosure. 
         FIG. 6  is a diagram of an illustrative aspect of a system operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 7  is a diagram of an illustrative aspect of operation of components of the system of  FIG. 6 , in accordance with some examples of the present disclosure. 
         FIG. 8  is a diagram of a particular implementation of a method of call audio playback speed adjustment that may be performed by a device of  FIGS. 1-3 , in accordance with some examples of the present disclosure. 
         FIG. 9  is a diagram of a particular implementation of a method of call audio playback speed adjustment that may be performed by a device of  FIGS. 1-3 , in accordance with some examples of the present disclosure. 
         FIG. 10  is a diagram of a particular implementation of a method of call audio playback speed adjustment that may be performed by a device of  FIGS. 1-3 , in accordance with some examples of the present disclosure. 
         FIG. 11  is a diagram of a particular implementation of a method of call audio playback speed adjustment that may be performed by a device of  FIG. 6 , in accordance with some examples of the present disclosure. 
         FIG. 12  illustrates an example of an integrated circuit operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 13  is a diagram of a mobile device operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 14  is a diagram of a headset operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 15  is a diagram of a wearable electronic device operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 16  is a diagram of a voice-controlled speaker system operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 17  is a diagram of a camera operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 18  is a diagram of a headset, such as a virtual reality or augmented reality headset, operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 19  is a diagram of a first example of a vehicle operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 20  is a diagram of a second example of a vehicle operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
         FIG. 21  is a block diagram of a particular illustrative example of a device that is operable to adjust call audio playback speed, in accordance with some examples of the present disclosure. 
     
    
    
     IV. DETAILED DESCRIPTION 
     Missing a portion of a call can adversely impact user experience. For example, during a call between a first user and a second user, if some audio frames sent by a first device of the first user are not received by a second device of the second user, the second user can miss a portion of speech of the first user. As another example, the second user may miss part of the call for other reasons, e.g., steps away or becomes distracted. The second user has to guess what was said by the first user or ask the first user to repeat what was missed. This can cause miscommunication, disrupt the flow of conversation, and waste time. 
     Systems and methods of call audio playback speed adjustment are disclosed. For example, a first call manager of a first device establishes a call with a second call manager of a second device. The first call manager, during the call, sends a sequence of audio frames to the second device and buffers at least the most recently sent audio frames. The second call manager receives at least some of the sequence of audio frames and buffers the received audio frames for playback. 
     In a particular example, a second frame loss manager of the second device, in response to detecting a frame loss, sends a frame loss indication to the first device. For example, the second frame loss manager detects the frame loss in response to determining that no audio frames have been received within a particular duration of receiving a last received (e.g., most recently received) audio frame. The frame loss indication indicates the last received audio frame. 
     A first frame loss manager of the first device, in response to receiving the frame loss indication, resends a set of audio frames to the second device. For example, the set of audio frames is subsequent to the last received audio frame in the sequence. The second call manager plays back the set of audio frames at a second playback speed that is faster than a first playback speed of previous audio frames. In a particular example, the first frame loss manager sends a second set of audio frames that is based on the set of audio frames such that playback of the second set of audio frames at the first playback speed corresponds to an effective second playback speed of the set of audio frames. To illustrate, if the second set of audio frames includes every other frame of the set of audio frames, playback of the second set of audio frames at the first playback speed corresponds to an effective playback speed of the set of audio frames that is twice as fast as the first playback speed. Playing back audio frames at a faster speed (or a faster effective speed) enables the first device to catch up to the call. 
     In a particular example, the second user pauses audio playback during the call and then resumes audio playback. For example, playback is paused after a last played (e.g., most recently played) audio frame. The second call manager of the second device, in response to determining that playback is to be resumed, plays back a set of audio frames at a second playback speed that is faster than a first playback speed of previous audio frames. The set of audio frames is subsequent to the last played audio frame in the sequence. 
     The second call manager plays back subsequent audio frames at the first playback speed. In a particular example, the second call manager transitions between the second playback speed and the first playback speed so that the change in playback speed is less noticeable (e.g., not noticeable). 
     Particular aspects of the present disclosure are described below with reference to the drawings. In the description, common features are designated by common reference numbers. As used herein, various terminology is used for the purpose of describing particular implementations only and is not intended to be limiting of implementations. For example, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Further, some features described herein are singular in some implementations and plural in other implementations. To illustrate,  FIG. 1  depicts a device  102  including one or more processors (“processor(s)”  120  of  FIG. 1 ), which indicates that in some implementations the device  102  includes a single processor  120  and in other implementations the device  102  includes multiple processors  120 . For ease of reference herein, such features are generally introduced as “one or more” features and are subsequently referred to in the singular unless aspects related to multiple of the features are being described. 
     As used herein, the terms “comprise,” “comprises,” and “comprising” may be used interchangeably with “include,” “includes,” or “including.” Additionally, the term “wherein” may be used interchangeably with “where.” As used herein, “exemplary” indicates an example, an implementation, and/or an aspect, and should not be construed as limiting or as indicating a preference or a preferred implementation. As used herein, an ordinal term (e.g., “first,” “second,” “third,” etc.) used to modify an element, such as a structure, a component, an operation, etc., does not by itself indicate any priority or order of the element with respect to another element, but rather merely distinguishes the element from another element having a same name (but for use of the ordinal term). As used herein, the term “set” refers to one or more of a particular element, and the term “plurality” refers to multiple (e.g., two or more) of a particular element. 
     As used herein, “coupled” may include “communicatively coupled,” “electrically coupled,” or “physically coupled,” and may also (or alternatively) include any combinations thereof. Two devices (or components) may be coupled (e.g., communicatively coupled, electrically coupled, or physically coupled) directly or indirectly via one or more other devices, components, wires, buses, networks (e.g., a wired network, a wireless network, or a combination thereof), etc. Two devices (or components) that are electrically coupled may be included in the same device or in different devices and may be connected via electronics, one or more connectors, or inductive coupling, as illustrative, non-limiting examples. In some implementations, two devices (or components) that are communicatively coupled, such as in electrical communication, may send and receive signals (e.g., digital signals or analog signals) directly or indirectly, via one or more wires, buses, networks, etc. As used herein, “directly coupled” may include two devices that are coupled (e.g., communicatively coupled, electrically coupled, or physically coupled) without intervening components. 
     In the present disclosure, terms such as “determining,” “calculating,” “estimating,” “shifting,” “adjusting,” etc. may be used to describe how one or more operations are performed. It should be noted that such terms are not to be construed as limiting and other techniques may be utilized to perform similar operations. Additionally, as referred to herein, “generating,” “calculating,” “estimating,” “using,” “selecting,” “accessing,” and “determining” may be used interchangeably. For example, “generating,” “calculating,” “estimating,” or “determining” a parameter (or a signal) may refer to actively generating, estimating, calculating, or determining the parameter (or the signal) or may refer to using, selecting, or accessing the parameter (or signal) that is already generated, such as by another component or device. 
     Referring to  FIG. 1 , a particular illustrative aspect of a system configured to adjust call audio playback speed is disclosed and generally designated  100 . The system  100  includes a device  102  that is coupled, via a network  106 , to a device  104 . 
     The device  102  is coupled to a speaker  129 . The device  102  includes a memory  132  coupled to one or more processors  120 . In a particular example, the memory  132  includes a receive buffer  134  (e.g., a circular buffer) configured to store most recently received audio frames for playback. The memory  132  is configured to store data indicating a first playback speed  105 . In a particular aspect, the first playback speed  105  is based on a configuration setting, default data, a user input, or a combination thereof. In a particular implementation, the first playback speed  105  corresponds to a normal (e.g., expected) playback speed for a call. The one or more processors  120  include a call manager  122  and a frame loss manager  124 . 
     The device  104  is coupled to a microphone  146 . The device  104  includes a memory  154  coupled to one or more processors  150 . In a particular example, the memory  154  includes a send buffer  110  (e.g., a circular buffer) configured to store most recently sent audio frames. The one or more processors  150  include a call manager  152  and a frame loss manager  156 . 
     The call manager  122  and the call manager  152  are configured to manage calls (e.g., audio calls, video calls, or both) for the device  102  and the device  104 , respectively. In a particular aspect, the call manager  122  and the call manager  152  correspond to clients of a communication application (e.g., an online meeting application). In a particular aspect, the frame loss manager  124  and the frame loss manager  156  are configured to manage frame loss recovery during calls for the device  102  and the device  104 , respectively. 
     In some implementations, the call manager  122  and the call manager  152  are blind (e.g., unaware) of any frame loss that is managed by the frame loss manager  124  and the frame loss manager  156 . In some implementations, the call manager  122  and the call manager  152  correspond to a higher layer (e.g., application layer) of a network protocol stack (e.g., open systems interconnection (OSI) model) of the device  102  and the device  104 , respectively. In some implementations, the frame loss manager  124  and the frame loss manager  156  correspond to a lower level (e.g., a transport layer) of the network protocol stack of the device  102  and the device  104 , respectively. 
     In some implementations, the device  102 , the device  104 , or both, correspond to or are included in one or various types of devices. In an illustrative example, the one or more processors  120 , the one or more processors  150 , or a combination thereof, are integrated in a headset device that includes a microphone, a speaker, or both, such as described further with reference to  FIG. 14 . In other examples, the one or more processors  120 , the one or more processors  150 , or a combination thereof, are integrated in at least one of a mobile phone or a tablet computer device, as described with reference to  FIG. 13 , a wearable electronic device, as described with reference to  FIG. 15 , a voice-controlled speaker system, as described with reference to  FIG. 16 , a camera device, as described with reference to  FIG. 17 , or a virtual reality headset or an augmented reality headset, as described with reference to  FIG. 18 . In another illustrative example, the one or more processors  120 , the one or more processors  150 , or a combination thereof, are integrated into a vehicle that also includes a microphone, a speaker, or both, such as described further with reference to  FIG. 19  and  FIG. 20 . 
     During operation, the call manager  122  and the call manager  152  establish a call (e.g., an audio call, a video call, an online meeting, or a combination thereof) between the device  102  and the device  104 . For example, the call is between a user  144  of the device  104  and a user  142  of the device  102 . The microphone  146  captures speech of the user  144  while the user  144  is talking and provides audio input  141  representing the speech to the device  104 . The call manager  152  generates a sequence  119  of audio frames based on the audio input  141  and sends the sequence  119  of audio frames to the device  102 . For example, the sequence  119  includes a set of audio frames  109 , an audio frame  111 , a set of audio frames  113 , next audio frames  117 , one or more additional audio frames, or a combination thereof. To illustrate, the call manager  152  generates audio frames of the sequence  119  as the audio input  141  is being received and sends (e.g., initiates transmission of) the sequence  119  of audio frames as the audio frames are generated. 
     In a particular aspect, the frame loss manager  156  buffers the audio frames of the sequence  119  in the send buffer  110  as the audio frames are sent by the call manager  152 . For example, the call manager  152  sends each of the set of audio frames  109 , via the network  106 , to the device  102 . The call manager  152  sends the audio frame  111  at a first send time, via the network  106 , to the device  102 . Similarly, the call manager  152  sends each of the set of audio frames  113 , via the network  106 , to the device  102 . The frame loss manager  156  stores each of the set of audio frames  109 , the audio frame  111 , and each of the set of audio frames  113  in the send buffer  110 . 
     The device  102  receives the sequence  119  of audio frames via the network  106  from the device  104 . In a particular implementation, the device  102  receives sets (e.g., bursts) of audio frames of the sequence  119 . In an alternative implementation, the device  102  receives one audio frame at a time of the sequence  119 . 
     In a particular example, the frame loss manager  124  receives each of the set of audio frames  109  of the sequence  119  and stores each of the set of audio frames  109  in the receive buffer  134 . The call manager  122  retrieves one or more of the set of audio frames  109  from the receive buffer  134  and plays out the retrieved audio frames via the speaker  129  at the first playback speed  105 . The set of audio frames  109  is prior to the audio frame  111  in the sequence  119 . 
     The frame loss manager  124  receives the audio frame  111  at a first receipt time. In a particular aspect, the frame loss manager  124  stores the audio frame  111  in the receive buffer  134  for playback (e.g., while one or more of the set of audio frames  109  are being played out at corresponding playback times). For example, the frame loss manager  124  adds a delay between receiving the audio frame  111  and play back by the call manager  122  of the audio frame  111  at a first playback time t 0  increase a likelihood that a subsequent frame is available at a corresponding playback time (e.g., a second playback time) in the receive buffer  134 . 
     In a particular example, the frame loss manager  124  detects frame loss subsequent to receiving the audio frame  111 . For example, the frame loss manager  124  detects the frame loss in response to determining that no audio frame of the sequence  119  has been received for a threshold duration since the audio frame  111  (e.g., a last received audio frame of the sequence  119 ) was received at the first receipt time. 
     The frame loss manager  124 , in response to detecting the frame loss, initiates transmission of a frame loss indication  121  via the network  106  to the device  104 . In a particular aspect, the frame loss indication  121  indicates (e.g., includes an identifier of) the audio frame  111  (e.g., the last received audio frame). In another aspect, the frame loss indication  121  includes a request to retransmit previous audio frames corresponding to an estimated playback duration of lost frames at the first playback speed  105 . For example, the frame loss manager  124  determines, at a particular time, the estimated playback duration based on the first receipt time (e.g., of the last received audio frame) and the particular time (e.g., the estimated playback duration=particular time−first receipt time). 
     The frame loss manager  156  receives the frame loss indication  121 , via the network  106 , from the device  102 . In a particular implementation, the frame loss manager  156  determines that the frame loss indication  121  indicates (e.g., includes an identifier of) that the audio frame  111  corresponds to the last received audio frame at the device  102 . In an alternative implementation, the frame loss manager  156 , in response to determining that the frame loss indication  121  includes a request to retransmit previous audio frames corresponding to the estimated playback duration of the lost frames at the first playback speed  105 , identifies a last received audio frame based on the estimated playback duration. For example, the frame loss manager  156  determines, at a particular time, a last send time based on a difference between the particular time and the estimated playback duration (e.g., last send time=particular time−estimated playback duration) and identifies the audio frame  111  as the last received audio frame in response to determining that the last send time matches the send time of the audio frame  111 . 
     The frame loss manager  156  determines, based on the last received audio frame, previous audio frames that are to be retransmitted. For example, the frame loss manager  156 , in response to determining that the audio frame  111  corresponds to the last received audio frame at the device  102  and that the set of audio frames  113  is subsequent to the last received audio frame in the sequence  119  and has been previously transmitted, identifies the set of audio frames  113  as the previous audio frames to be retransmitted. 
     The frame loss manager  156 , in response to determining that previous audio frames to be retransmitted include the set of audio frames  113  and that the set of audio frames  113  is available in the send buffer  110 , generates a set of audio frames  123  based on the set of audio frames  113  and initiates transmission, via the network  106  to the device  102 , of the set of audio frames  123 , an indication of a second playback speed  115 , or both. The second playback speed  115  is greater than the first playback speed  105 . In a particular implementation, the set of audio frames  123  is the same as the set of audio frames  113  and the frame loss manager  156  initiates transmission of the set of audio frames  123  and the indication of the second playback speed  115 . 
     In an alternative implementation, the set of audio frames  123  includes a subset of the set of audio frames  113  such that playback of the set of audio frames  123  at the first playback speed  105  corresponds to an effective playback of the set of audio frames  113  at the second playback speed  115 . For example, if the set of audio frames  123  includes every other frame of the set of audio frames  113 , playback of the set of audio frames  123  at the first playback speed  105  corresponds to an effective playback speed of the set of audio frames  113  (e.g., the second playback speed  115 ) that is twice as fast the first playback speed  105 . The frame loss manager  156  initiates transmission of the set of audio frames  123  without an indication of the second playback speed  115  because playback of the set of audio frames  123  at the first playback speed  105  (e.g., the normal playback speed) corresponds to an effective playback speed adjustment to the second playback speed  115 . 
     In a particular aspect, the frame loss manager  156  determines the second playback speed  115  based on a count of the set of audio frames  113 , a default value, a configuration setting, a user input, or a combination thereof. For example, the second playback speed  115  is higher for a greater number of audio frames that are retransmitted. 
     In a particular implementation, the frame loss manager  156  at least partially suppresses silence of the set of audio frames  113  in the set of audio frames  123 . For example, the frame loss manager  156 , in response to determining that the set of audio frames  113  includes a silence frame, transmits an indication of a third playback speed for a corresponding silence frame in the set of audio frames  123 . In a particular aspect, the frame loss manager  156  selects fewer silence frames than audio frames of the set of audio frames  113  to generate the set of audio frames  123 . For example, the frame loss manager  156  selects every other audio frame of the set of audio frames  113  and selects every fourth silence frame of the set of audio frames  113 . The third playback speed is greater than the second playback speed  115 . For example, shortening silences can lead to the device  102  to catch up faster to the call (e.g., returning to playing subsequent audio frames at the first playback speed  105 ). 
     In a particular implementation, the frame loss manager  156  selectively initiates transmission of the set of audio frames  123  in response to determining that a count of the previous audio frames to be retransmitted is greater than a first threshold, less than a second threshold, or both. For example, if too few audio frames have been lost, the frame loss may not be noticeable enough to perform playback speed adjustment. As another example, if too many audio frames have been lost, playback speed may have to be increased noticeably to catch up to the call and the playback speed adjustment may impact user experience more adversely than the missing audio frames. In a particular aspect, the frame loss manager  156  initiates transmission of the set of audio frames  123 , in response to determining that a network link is reestablished with the device  102 . 
     In a particular aspect, the frame loss manager  156 , in response to determining that the count of the previous audio frames is less than or equal to the first threshold or greater than or equal to the second threshold, sends a skip ahead notification to the device  102 . In a particular aspect, the skip ahead notification indicates a subsequent audio frame to be transmitted by the device  104 . For example, the skip ahead notification indicates an initial audio frame of next audio frames  117  of the sequence  119 . The frame loss manager  156  initiates transmission of the next audio frames  117  subsequent to (or concurrently with) transmission of the skip ahead notification. The next audio frames  117  are subsequent to the set of audio frames  113  in the sequence  119 . In a particular aspect, the next audio frames  117  have not been previously transmitted during the call. 
     In a particular aspect, the frame loss manager  156 , in response to determining that the previous audio frames are to be re-transmitted, initiates transmission of the next audio frames  117  concurrently with the transmission of the set of audio frames  123 . For example, the transmission of the set of audio frames  123  (corresponding to the retransmission of at least a subset of the set of audio frames  113 ) does not delay an initial transmission of the next audio frames  117 . In a particular aspect, the next audio frames  117  are associated with a transition from the second playback speed  115  of the set of audio frames  123  (e.g., retransmitted audio frames) and the first playback speed  105  (e.g., the normal playback speed). For example, the frame loss manager  156  transmits a first subset of the next audio frames  117  with an indication of the second playback speed  115 , a second subset of the next audio frames  117  with an indication of an intermediate playback speed that is between the second playback speed  115  and the first playback speed  105 , a third subset of the next audio frames  117  with an indication of the first playback speed  105 , or a combination thereof. In an alternative implementation, the frame loss manager  156  selects first audio frames of the first subset based on the second playback speed  115  (e.g., every other audio frame) and selects second audio frames of the second subset based on the intermediate playback speed. The frame loss manager  156  transitions the next audio frames  117  from the second playback speed  115  to the first playback speed  105  by initiating transmission of the selected first audio frames of the first subset, the selected second audio frames of the second subset, and the audio frames of the third subset. 
     The frame loss manager  124 , responsive to the frame loss indication  121 , receives the set of audio frames  123 , an indication of the second playback speed  115 , or both. The frame loss manager  124  initiates playback, via the speaker  129 , of the set of audio frames  123  based on the second playback speed  115 , as further described with reference to  FIG. 5 . 
     In a particular implementation, the set of audio frames  123  is the same as the set of audio frames  113 . The frame loss manager  124  adds the set of audio frames  123  and the indication of the second playback speed  115  to the receive buffer  134 . The call manager  122  retrieves one or more of the set of audio frames  123  from the receive buffer  134  and performs playback of the set of audio frames  123  based on the second playback speed  115 . To illustrate, the call manager  122  provides, based on the second playback speed  115 , each of the set of audio frames  123  to the speaker  129  for playback. In an alternative aspect, the frame loss manager  124  retrieves, based on the second playback speed  115 , each audio frame of the set of audio frames  123  from the receive buffer  134  and provides the retrieved audio frame to the call manager  122 . The call manager  122  provides each received audio frame to the speaker  129  for playback. 
     In an alternative implementation, the set of audio frames  123  includes a subset of the set of audio frames  113  such that playback of the set of audio frames  123  at the first playback speed  105  corresponds to an effective playback speed (e.g., the second playback speed  115 ) of the set of audio frames  113 . The frame loss manager  124  adds the set of audio frames  123  to the receive buffer  134 . The call manager  122  retrieves one or more of the set of audio frames  123  from the receive buffer  134  and performs playback of the set of audio frames  123  based on the first playback speed  105 . To illustrate, the call manager  122  provides, based on the first playback speed  105 , each of the set of audio frames  123  to the speaker  129  for playback. In an alternative aspect, the frame loss manager  124  retrieves, based on the first playback speed  105 , each audio frame of the set of audio frames  123  from the receive buffer  134  and provides the retrieved audio frame to the call manager  122 . The call manager  122  provides each received audio frame to the speaker  129  for playback. 
     In a particular aspect, the frame loss manager  124  at least partially suppresses silence to initiate playback of the set of audio frames  123 . For example, the frame loss manager  124 , in response to determining that the set of audio frames  123  includes a silence frame, initiates playback of the silence frame at a third playback speed that is greater than the second playback speed  115 . As another example, the frame loss manager  124 , in response to receiving an indication of the third playback speed for the silence frame of the set of audio frames  123 , initiates playback of the silence frame at the third playback speed. 
     In a particular example, the frame loss manager  124  adds the silence frame and the indication of the third playback speed to the receive buffer  134 , and the call manager  122  performs playback of the silence frame based on the third playback speed. To illustrate, the call manager  122  provides, based on the third playback speed, the silence frame to the speaker  129  for playback. In an alternative aspect, the frame loss manager  124  retrieves, based on the third playback speed, the silence frame from the receive buffer  134  and provides the retrieved silence frame to the call manager  122 . The call manager  122  provides the received silence frame to the speaker  129  for playback. 
     In a particular aspect, the frame loss manager  124  receives the next audio frames  117  concurrently with receiving the set of audio frames  123 , as further described with reference to  FIG. 4 . In a particular aspect, the frame loss manager  124  transitions playback of the next audio frames  117  from the second playback speed  115  to the first playback speed  105 , as further described with reference to  FIG. 5 . 
     In a particular implementation, the frame loss manager  124  transitions the playback speed of the next audio frames  117  based on indications of playback speeds received for the next audio frames  117 . For example, the frame loss manager  124  initiates playback of the first subset of the next audio frames  117  based on the second playback speed  115  in response to receiving an indication of the second playback speed  115  for each of the first subset, initiates playback of the second subset of the next audio frames  117  based on the intermediate playback speed in response to receiving an indication of the intermediate playback speed for each of the second subset, initiates playback of the third subset of the next audio frames  117  at the first playback speed  105  in response to receiving an indication of the first playback speed  105  for each of the third subset, or a combination thereof. 
     In a particular implementation, the frame loss manager  124  transitions the playback speed of the next audio frames  117  based on the received audio frames of the next audio frames  117 . For example, the frame loss manager  124  playback the received audio frames of the next audio frames  117  at the first playback speed  105 . Because fewer first audio frames of the first subset of the next audio frames  117  are received, playback of the first audio frames at the first playback speed  105  corresponds to an effective playback speed of the second playback speed  115  for the first subset. Similarly, playback of the second audio frames of the second subset at the first playback speed  105  corresponds to an effective playback speed of the intermediated playback speed for the second subset. Playback of all frames of the third subset of the next audio frames  117  at the first playback speed  105  corresponds to an effective playback speed of the first playback speed  105  for the third subset. 
     In a particular implementation, the frame loss manager  124  transitions the playback speed of the next audio frames  117  based on a count of audio frames stored (e.g., remaining) in the receive buffer  134  for playback. For example, the frame loss manager  124  initiates playback of a first subset of the next audio frames  117  based on the second playback speed  115  in response to determining that more than a first threshold count of audio frames are available for playback in the receive buffer  134 , initiates playback of a second subset of the next audio frames  117  based on an intermediate playback speed between the second playback speed  115  and the first playback speed  105  in response to determining that less than or equal to the first threshold count and more than a second threshold count of audio frames are available for playback in the receive buffer  134 , initiates playback of a third subset of the next audio frames  117  at the first playback speed  105  in response to determining that less than or equal to the second threshold count of audio frames are available for playback in the receive buffer  134 , or a combination thereof. Transitioning the playback speed of the next audio frames  117  enables the playback speed adjustments to be less noticeable (e.g., not noticeable) and enables the device  102  to return to normal playback speed after catching up with the call. 
     In a particular implementation, the frame loss manager  124  receives a skip ahead notification responsive to the frame loss indication  121 . The frame loss manager  124 , in response to receiving the skip ahead notification and receiving the next audio frames  117 , initiates playback of the next audio frames  117  at the first playback speed  105 . 
     The system  100  thus enables receiving previously lost audio frames and catching up to a call by playing out audio frames at a faster playback speed. In some aspects, the transmission of the lost audio frames is selective based on a count of lost audio frames to balance effects of gaps in a call caused by the lost audio frames with speeding up the call audio to catch up. 
     Although the microphone  146  is illustrated as being coupled to the device  104 , in other implementations the microphone  146  may be integrated in the device  104 . Although the speaker  129  is illustrated as being coupled to the device  102 , in other implementations the speaker  129  may be integrated in the device  102 . Although one microphone is illustrated, in other implementations one or more additional microphones configured to capture user speech may be included. 
     It should be understood that the device  104  is described as a sending device and the device  102  is described as a receiving device for ease of illustration. During a call, roles of the device  102  and the device  104  can switch when the user  142  starts speaking. For example, the device  102  can be the sending device and the device  104  can be the receiving device. In a particular aspect, e.g., when both the user  142  and the user  144  are speaking at the same time or at overlapping times, each of the device  102  and the device  104  can be a sending device and a receiving device. 
     In a particular aspect, the call manager  122  is also configured to perform one or more operations described with reference to the call manager  152 , and vice versa. In a particular aspect, the frame loss manager  124  is also configured to perform one or more operations described with reference to the frame loss manager  156 , and vice versa. In a particular implementation, each of the device  102  and the device  104  includes a receive buffer, a send buffer, a speaker, and a microphone. 
     Referring to  FIG. 2 , a system configured to adjust call audio playback speed is disclosed and generally designated  200 . In a particular aspect, the system  100  of  FIG. 1  includes one or more components of the system  200 . The system  200  includes a server  204  coupled, via the network  106 , to the device  102  and the device  104 . 
     The server  204  includes a memory  232  coupled to one or more processors  220 . The memory  232  includes a buffer  210  (e.g., a circular buffer). The one or more processors  220  include a call manager  222  and a frame loss manager  224 . In a particular aspect, the frame loss manager  224  corresponds to the frame loss manager  156  of  FIG. 1 . 
     The call manager  222  is configured to receive and forward audio frames during a call. For example, the call manager  222  establishes a call between the call manager  152  and the call manager  122 . During the call, the call manager  152  captures speech of the user  144  and sends the sequence  119  of audio frames to the server  204 . The server  204  stores audio frames of the sequence  119  to the buffer  210  and forwards the audio frames to the device  102 . 
     The frame loss manager  124  sends the frame loss indication  121 , as described with reference to  FIG. 1 , to the server  204  (e.g., instead of the device  104 ). The frame loss manager  224  of the server  204  manages the frame loss recovery. For example, the device  104  is blind (e.g., unaware) of the frame loss detected at the device  102 . To illustrate, the frame loss manager  224  of the server  204  performs one or more operations described with reference to the frame loss manager  156  of  FIG. 1 . 
     The system  200  thus enables frame loss recovery for a legacy device (e.g., the device  104 ). In a particular aspect, the server  204  may also be closer (e.g., fewer network hops) to the device  102  and retransmitting missing audio frames from the server  204  (e.g., instead of from the device  104 ) may conserve overall network resources. In a particular aspect, the server  204  may have access to network information that can be useful for successfully retransmitting the set of audio frames  113  (e.g., the corresponding set of audio frames  123 ) to the device  102 . As an example, the server  204  initially transmits the set of audio frames  113  via a first network link. The server  204  receives the frame loss indication  121  and, based at least in part on determining that the first network link is unavailable (e.g., down), transmits the set of audio frames  123  using a second network link that appears to be available. 
     Referring to  FIG. 3 , a system configured to adjust call audio playback speed is disclosed and generally designated  200 . In a particular aspect, the system  100  of  FIG. 1  includes one or more components of the system  300 . The system  300  includes a server  204  coupled, via the network  106 , to the device  102 , the device  104 , a device  302 , one or more additional devices, or a combination thereof. 
     The call manager  222  is configured to establish a call between multiple devices. For example, the call manager  222  establishes a call between the user  142  of the device  102 , the user  144  of the device  104 , and a user  344  of the device  302 . During the call, the device  104  captures speech of the user  144  and sends a sequence  331  of audio frames to the server  204  while the device  302  captures speech of the user  344  and sends a sequence  333  to the server  204 . 
     In a particular aspect, the server  204  receives audio frames of the sequence  331  interspersed with receiving audio frames of the sequence  333 . For example, the user  144  and the user  344  are speaking one after the other, at the same time, or at overlapping times. The sequence  331  is illustrated as including a plurality of blocks. IT should be understood that each block of a sequence represents one or more audio frames. One block of a sequence may represent the same or different number (e.g., count) of audio frames as another block of the sequence. The server  204  stores the sequence  331  and the sequence  333  in the buffer  210  for the device  102  as the sequence  119 . The server  204  initiates transmission of the sequence  119  based at least in part on determining that audio frames of the sequence  119  are available in the buffer  210  for transmission to the device  102 . 
     The server  204  sends audio frames of the sequence  119  to the device  102 , receives the frame loss indication  121 , and transmits the set of audio frames  123  to the device  102 , as described with reference to  FIG. 2 . In a particular aspect, the server  204  forwards the sequence  333  to the device  104 , as described with reference to  FIG. 2 . In a particular aspect, the server  204  forwards the sequence  331  to the device  302 , as described with reference to  FIG. 2 . 
     The system  300  thus enables the server  204  to perform frame loss recovery for audio frames received from multiple devices during a call. For example, the playback speed of missed audio frames from the device  104  and the device  302  in the set of audio frames  113  is adjusted similarly in the set of audio frames  123  to retain the relative timing of conversation between the user  144  and the user  344 . 
     Referring to  FIG. 4 , a diagram is shown and generally designated  400 . The diagram  400  indicates an illustrative aspect of operation of components of the system  100  of  FIG. 1 , the system  200  of  FIG. 2 , the system  300  of  FIG. 3 , or a combination thereof. The timing and operations shown in  FIG. 4  are for illustration and are not limiting. In other aspects, additional or fewer operations may be performed and the timing may be different. 
     The diagram  400  illustrates timing of transmission of audio frames of the sequence  119  from a device  402  to the device  102 . In a particular aspect, the device  402  corresponds to the device  104  of  FIG. 1  or the server  204  of  FIGS. 2-3 . 
     The device  402  transmits the audio frame  111  to the device  102 . The audio frame  111  is received by the device  102  at a time t 0 . The device  402  transmits the set of audio frames  113  to the device  102 . For example, the device  402  transmits an audio frame  411 , an audio frame  413 , and an audio frame  415  to the device  102 . The audio frame  411 , the audio frame  413 , and the audio frame  415  are expected (e.g., without network issues) to be received around a time t 1 , a time t 2 , and a time t 3 , at the device  102 . The set of audio frames  113  is described as including 3 audio frames for ease of illustration. In other implementations, the set of audio frames  113  includes can include fewer than 3 audio frames or more than 3 audio frames. 
     The device  102  (e.g., the frame loss manager  124  of  FIG. 1 ) detects frame loss in response to determining, subsequent to the time t 3 , that no audio frames have been received within a threshold duration (e.g., threshold duration is less than or equal to the difference between time t 3  and time t 0 ) of the time t 0  of receipt of the audio frame  111 . 
     The device  102  (e.g., the frame loss manager  124 ), in response to detecting the frame loss, transmits the frame loss indication  121  to the device  402 . In a particular aspect, the frame loss indication  121  indicates the audio frame  111  (e.g., an identifier of the audio frame  111  or a playback duration of missed audio frames) as the last received audio frame of the sequence  119 , as described with reference to  FIG. 1 . 
     The device  402 , in response to receiving the frame loss indication  121  and determining that the set of audio frames  113  corresponds to the previous audio frames that have not been received by the device  102 , generates the set of audio frames  123  based on the set of audio frames  113 , as described with reference to  FIG. 1 . For example, the set of audio frames  123  includes an audio frame  451 , an audio frame  453 , an audio frame  457 , one or more additional frames, or a combination thereof, that are based on the audio frame  411 , the audio frame  413 , the audio frame  415 , one or more additional frames, or a combination thereof, of the set of audio frames  113 . In a particular implementation, the set of audio frames  123  includes the same audio frames as the set of audio frames  113 . In an alternative implementation, the set of audio frames  123  includes a subset of the set of audio frames  113 . 
     The device  402  transmits the set of audio frames  123  to the device  102 . In a particular aspect, the set of audio frames  123  is transmitted as a single transmission to the device  102 . In an alternative aspect, one or more audio frames of the set of audio frames  123  are transmitted to the device  102  with a shorter transmission interval as compared to an initial transmission of audio frames of the sequence  119  to the device  102 . For example, in normal operation, audio frames are expected to be transmitted or received at an expected interval (e.g., an average of a difference between the time t 1  and the time t 0 , a difference between the time t 2  and the time t 1 , a difference between the time t 3  and the time t 2 , etc.). The device  102  transmits the set of audio frames  123  with a shorter than the expected interval. 
     In a particular aspect, the next audio frames  117  transition from the second playback speed  115  to the first playback speed  105 . For example, the device  402  generates next audio frames  495  based on a first subset (e.g., next audio frames  491 ) of the next audio frames  117 . The next audio frames  495  have the second playback speed  115 . A second subset (e.g., next audio frames  493 ) have the first playback speed  105 . 
     In a particular implementation, the next audio frames  495  include the same audio frames as the next audio frames  491 . For example, an audio frame  457 , an audio frame  459 , and an audio frame  461  of the next audio frames  495  is the same as an audio frame  417 , an audio frame  419 , and an audio frame  421 , respectively, of the next audio frames  491 . The device  402  transmits the next audio frames  495  with an indication of the second playback speed  115  for each of the next audio frames  495 . The device  102  receives the audio frame  457  at a time t 4  (e.g., an expected receipt of the audio frame  417 ). The device  102  receives the audio frame  459  at a time t 5  (e.g., an expected receipt time of the audio frame  419 ). The device  102  receives the audio frame  461  at a time t 6  (e.g., an expected receipt time of the audio frame  421 ). 
     In a particular implementation, the next audio frames  495  include a subset (e.g., every other audio frame) of the next audio frames  491 . As an illustrative example, the device  402  transmits the audio frame  457  (e.g., based on the audio frame  417 ) and the audio frame  461  (e.g., based on the audio frame  421 ) without transmitting any audio frame (e.g., the audio frame  459 ) based on the audio frame  419 . In this example, the device  102  receives the audio frame  457  at the time t 4 , does not receive the audio frame  459 , and receives the audio frame  461  at the time t 5 . Since the next audio frames  495  include a subset of the next audio frames  491 , playback of the next audio frames  495  at the first playback speed  105  corresponds to an effective playback speed (e.g., the second playback speed  115 ) of the next audio frames  491  that is greater than the first playback speed  105 . 
     In a particular example, the device  402  transmits the set of audio frames  123  concurrently with transmission of the next audio frames  117 . For example, the device  402  transmits the audio frame  457  at an expected transmission time of the audio frame  417  that is based on a transmission time of the audio frame  415  and an expected transmission interval (e.g., a default transmission interval). 
     The device  402  transmits the next audio frames  493  (e.g., an audio frame  423 , an audio frame  425 , one or more additional audio frames, or a combination thereof) at the first playback speed  105 . For example, the device  102  receives the audio frame  423  at a time t 7 , the audio frame  425  at a time t 8 , or both. 
     The diagram  400  thus illustrates that transmission of the set of audio frames  123  does not delay transmission of the next audio frames  117 . In a particular implementation, the next audio frames  117  transition from the second playback speed  115  to the first playback speed  105 . For example, the next audio frames  491  have the second playback speed  115  and the next audio frames  493  have the first playback speed  105 . 
     Referring to  FIG. 5 , a diagram is shown and generally designated  500 . The diagram  500  indicates an illustrative aspect of operation of components of the system  100  of  FIG. 1 , the system  200  of  FIG. 2 , the system  300  of  FIG. 3 , or a combination thereof. The timing and operations shown in  FIG. 5  are for illustration and are not limiting. In other aspects, additional or fewer operations may be performed and the timing may be different. 
     The device  402  generates the audio frame  111 , the audio frame  411 , the audio frame  413 , the audio frame  415 , the audio frame  417 , the audio frame  419 , the audio frame  421 , the audio frame  423 , the audio frame  425 , one or more additional audio frames, or a combination thereof, of the sequence  119 . 
     The device  402  transmits the audio frame  411  to the device  102 . The device  102  plays out the audio frame  411  based on the first playback speed  105 . The device  402  transmits each of the audio frame  413 , the audio frame  415 , and the audio frame  417 . The device  102  does not receive any of the audio frame  413 , the audio frame  415 , or the audio frame  417 . 
     The device  402  transmits the set of audio frames  123  (e.g., the audio frame  451 , the audio frame  453 , and the audio frame  455 ) concurrently with transmission of the next audio frames  117 . For example, the device  402  generates the next audio frames  495  (e.g., the audio frame  457 , the audio frame  459 , and the audio frame  461 ) corresponding to the next audio frames  491  based on the second playback speed  115 , as described with reference to  FIG. 4 . The device  402  initiates transmission of the next audio frames  495  and the next audio frames  493  at an expected time of initiating transmission of the next audio frames  117 . For example, the device  402  transmits the audio frame  457 , the audio frame  459 , the audio frame  461 , the audio frame  423 , and the audio frame  425  at an expected transmission time of the corresponding audio frame  417 , the corresponding audio frame  419 , the corresponding audio frame  421 , the audio frame  423 , and the audio frame  425 . 
     The device  102  plays out the set of audio frames  123  and the next audio frames  491  based on the second playback speed  115  (e.g., twice as fast as the first playback speed  105 ). For example, the device  102  plays out the audio frame  451  and the audio frame  453  at the second playback speed  115  in the same time it would have taken to play out a single audio frame at the first playback speed  105 . Similarly, the device  102  plays out the audio frame  455  and the audio frame  457  at the second playback speed  115  in the same time it would have taken to play out a single audio frame at the first playback speed  105 . 
     In a particular aspect, there is a gap in playout of the audio frame  111  and playout of the audio frame  451  at the device  102 . Playing out the set of audio frames  123  and the next audio frames  491  enables catching up to the call so the next audio frames  493  can be played out at the first playback speed  105 . For example, the device  102  plays out the audio frame  423  and the audio frame  425  at the first playback speed  105 . 
     The next audio frames  491  are played out based on the second playback speed  115  to compensate for delay in initiating play out of the next audio frames  117  caused by playing out the set of audio frames  123 . For example, the audio frame  451  and the audio frame  453  are played out at the time that audio frame  417  would have played out in normal conditions. To catch up to the call, if the second playback speed  115  is twice as fast as the first playback speed  105 , the same number of additional audio frames (e.g.,  3  additional audio frames) of the sequence  119  have to be played out based on the second playback speed  115  as the number of audio frames (e.g., 3 audio frames) that were lost. For example, if audio frames corresponding to a playback duration (e.g., 30 seconds) at the first playback speed  105  are lost, audio frames corresponding to the playback duration (e.g., 30 seconds) at the second playback speed  115  are played out to catch up to the call if the second playback speed  115  is twice as fast as the first playback speed  105 . To illustrate, the first half of the playback duration (e.g., 15 seconds) is used to playout the missed audio frames based on the second playback speed  115  and the second half of the playback duration (e.g., 15 seconds) is used to playout the audio frames that would have been played during the playback duration (e.g., 30 seconds) at the first playback speed  105  under normal conditions. In a particular aspect, partial silence suppression can enable catching up faster or reducing the speed at which the audio frames have to be played to achieve the second playback speed  115  overall for the set of audio frames  123  or to achieve the second playback speed  115  as the effective playback speed overall for the set of audio frames  113 . 
     Referring to  FIG. 6 , a system operable to adjust call audio playback speed is shown and generally designated  600 . In a particular aspect, the system  100  of  FIG. 1  includes one or more components of the system  600 . 
     The one or more processors  120  include a pause manager  624 . The device  102  receives the sequence  119  of audio frames during a call and stores audio frames of the sequence  119  in the receive buffer  134 . In a particular aspect, the sequence  119  corresponds to audio frames received during a call with a single additional device, as described with reference to  FIGS. 1-2 . For example, the call is between no more than two devices, including the device  102  and the device  104 . In an alternative aspect, the sequence  119  corresponds to audio frames received during a call with multiple second devices, as described with reference to  FIG. 3 . The call manager  122  retrieves audio frames from receive buffer  134  and plays them out via the speaker  129 . For example, the call manager  122  generates the audio output  143  based on the retrieved audio frames and provides the audio output  143  to the speaker  129 . To illustrate, the call manager  122  plays out the set of audio frames  109 , the audio frame  111 , or a combination thereof, at the first playback speed  105 . 
     The device  102  receives a pause command  620  (e.g., via a user input) from the user  142 . The pause command  620  indicates a user request to pause playback of the call. The pause manager  624 , in response to receiving the pause command  620 , stops playout of audio frames of the sequence  119 . For example, the pause manager  624  receives the pause command  620  subsequent to playout, by the call manager  122 , of the audio frame  111  at a playback time. The pause manager  624  stops the call manager  122  from playing out subsequent audio frames of the sequence  119 . In a particular implementation, the pause manager  624  marks audio frames (e.g., the set of audio frames  113 ) subsequent to the audio frame  111  that are stored in the receive buffer  134  as unavailable for playback. 
     The pause manager  624  receives, at a resume time, a resume command  622  (e.g., via a user input) from the user  142 . The resume command  622  indicates a user request to resume playback of the call. In a particular aspect, the pause manager  624  identifies the set of audio frames  113  as the previous audio frames that have missed playback. For example, the pause manager  624  determines that the set of audio frames  113  would have been played out during a pause duration  623  between the playback time of the last played audio frame (e.g., the audio frame  111 ) and the resume time. 
     In a particular aspect, the pause manager  624  performs one or more operations described with reference to the frame loss manager  156 , the frame loss manager  124  of  FIG. 1 , or both. For example, the pause manager  624  generates the set of audio frames  123  based on the set of audio frames  113 , as described with reference to  FIG. 1 . In a particular implementation, the set of audio frames  123  includes the same audio frames as the set of audio frames  113  and the pause manager  624  plays out the set of audio frames  123  (e.g., the set of audio frames  113 ) at the second playback speed  115 . In another implementation, the set of audio frames  123  includes a subset of the set of audio frames  113  so that playout of the set of audio frames  123  at the first playback speed  105  corresponds to an effective playback speed (e.g., the second playback speed  115 ) of the set of audio frames  113 . The pause manager  624  transitions the next audio frames  117  from the second playback speed  115  to the first playback speed  105 , as described with reference to  FIG. 1 . 
     In a particular example, the pause manager  624  performs at least partial silence suppression in the set of audio frames  123 , a subset of the next audio frames  117 , or both, as described with reference to  FIG. 1 . In a particular aspect, the pause manager  624  determines the second playback speed  115  based on a count of audio frames in the receive buffer  134  available for playback. In a particular aspect, the pause manager  624  determines the second playback speed  115  based on the pause duration  623 . For example, a longer pause duration  623  corresponds to a higher second playback speed  115 . In a particular implementation, the pause manager  624  selectively generates the set of audio frames  123  based on the set of audio frames  113 , as described with reference to  FIG. 1 . For example, the pause manager  624  generates the set of audio frames  123  for playback based on the second playback speed  115  (e.g., an actual playback speed or an effective playback speed) or skips ahead to playback of the next audio frames  117  at the first playback speed  105 . 
     The system  600  thus enables the user  142  to pause a call (e.g., a real-time call). The user  142  can resume the call and catch up to the conversation without having to ask other participants to repeat what was missed. 
     Referring to  FIG. 7 , a diagram is shown and generally designated  700 . The diagram  700  indicates an illustrative aspect of operation of components of the system  600  of  FIG. 6 . The timing and operations shown in  FIG. 7  are for illustration and are not limiting. In other aspects, additional or fewer operations may be performed and the timing may be different. 
     During a call, the device  102  receives the audio frame  111 , the audio frame  411 , the audio frame  413 , the audio frame  415 , the audio frame  417 , the audio frame  419 , the audio frame  421 , the audio frame  423 , the audio frame  425 , one or more additional audio frames of the sequence  119 , or a combination thereof, from the device  402 . 
     The device  102  (e.g., the call manager  122 ) plays out the audio frame  111  at the first playback speed  105 . The device  102  receives the pause command  620  and pauses playback of the call during the pause duration  623 , as described with reference to  FIG. 6 . For example, the device  102  refrains from playing out the audio frame  411 , the audio frame  413 , and the audio frame  415  that would have been played out during the pause duration  623  at the first playback speed  105  during normal operation. 
     The device  102  receives the resume command  622  and resumes playback of the call, as described with reference to  FIG. 6 . For example, the device  102  (e.g., the pause manager  624 ) generates the set of audio frames  123  (e.g., the audio frame  451 , the audio frame  453 , and the audio frame  455 ) from the set of audio frames  113  and plays out the set of audio frames  123  based on the second playback speed  115 , as described with reference to  FIG. 5 . 
     The pause manager  624  transitions from the second playback speed  115  to the first playback speed  105  for the next audio frames  117 . For example, the pause manager  624  generates the next audio frames  495  corresponding to the next audio frames  491  based on the second playback speed  115 , as described with reference to  FIG. 4 . For example, the next audio frames  495  are the same as the next audio frames  491  and are played out at the second playback speed  115  or the next audio frames  495  are a subset of the next audio frames  491  such that playing out the next audio frames  495  at the first playback speed  105  corresponds to an effective playback speed (e.g., the second playback speed  115 ) of the next audio frames  491 , as described with reference to  FIG. 5 . The pause manager  624  transitions from the second playback speed  115  to the first playback speed  105  by playing out the next audio frames  493  based on the first playback speed  105 . For example, the pause manager  624  plays out the audio frame  423  and the audio frame  425  at the first playback speed  105 . 
     Referring to  FIG. 8 , a particular implementation of a method  800  of call audio playback speed adjustment is shown. In a particular aspect, one or more operations of the method  800  are performed by at least one of the frame loss manager  124 , the call manager  122 , the one or more processors  120 , the device  102 , the system  100  of  FIG. 1 , the system  200  of  FIG. 2 , the system  300  of  FIG. 3 , or a combination thereof. 
     The method  800  includes receiving a sequence of audio frames from a first device during a call, at  802 . For example, the device  102  receives the sequence  119  of audio frames from the device  104  during a call, as described with reference to  FIG. 1 . 
     The method  800  also includes, in response to determining that no audio frame of the sequence has been received for a threshold duration since a last received audio frame of the sequence, initiating transmission of a frame loss indication to the first device, at  804 . For example, the frame loss manager  124  of  FIG. 1 , in response to determining that no audio frame of the sequence  119  has been received for a threshold duration since a last received frame (e.g., the audio frame  111 ) of the sequence  119 , initiates transmission of the frame loss indication  121  to the device  104 , as described with reference to  FIG. 1 . 
     The method  800  further includes, responsive to the frame loss indication, receiving a set of audio frames of the sequence and an indication of a second playback speed from the first device, at  806 . For example, the device  102  of  FIG. 1 , responsive to the frame loss indication  121 , receives the set of audio frames  123  of the sequence  119  and an indication of the second playback speed  115  from the device  104 , as described with reference to  FIG. 1 . 
     The method  800  also includes initiating playback, via a speaker, of the set of audio frames based on the second playback speed, at  808 . For example, the frame loss manager  124  initiates playback, via the speaker  129 , of the set of audio frames  123  at based on the second playback speed  115 , as described with reference to  FIG. 1 . The second playback speed  115  is greater than the first playback speed  105  of the set of audio frames  109  of the sequence  119 . The method  800  thus enables receiving previously lost audio frames and catching up to a call by playing out audio frames at a faster playback speed. 
     The method  800  of  FIG. 8  may be implemented by a field-programmable gate array (FPGA) device, an application-specific integrated circuit (ASIC), a processing unit such as a central processing unit (CPU), a DSP, a controller, another hardware device, firmware device, or any combination thereof. As an example, the method  800  of  FIG. 8  may be performed by one or more processors that execute instructions, such as described with reference to  FIG. 21 . 
     Referring to  FIG. 9 , a particular implementation of a method  900  of call audio playback speed adjustment is shown. In a particular aspect, one or more operations of the method  900  are performed by at least one of the frame loss manager  156 , the call manager  152 , the one or more processors  150 , the device  104 , the system  100  of  FIG. 1 , the system  200  of  FIG. 2 , the system  300  of  FIG. 3 , or a combination thereof. 
     The method  900  includes initiating transmission of a sequence of audio frames to a second device during a call, at  902 . For example, the device  104  of  FIG. 1  initiates transmission of the sequence  119  of audio frames to the device  102  during a call, as described with reference to  FIG. 1 . 
     The method  900  also includes receiving a frame loss indication from the second device, at  904 . For example, the frame loss manager  156  of  FIG. 1  receives the frame loss indication  121  from the device  102 , as described with reference to  FIG. 1 . 
     The method  900  further includes determining, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device, at  906 . For example, the frame loss manager  156  of  FIG. 1  determines, based on the frame loss indication  121 , a last received audio frame (e.g., the audio frame  111 ) of the sequence  119  that was received by the device  102 , as described with reference to  FIG. 1 . 
     The method  900  also includes, based at least in part on determining that a set of audio frames that is subsequent to the last received audio frame in the sequence is available, initiating transmission of the set of audio frames and an indication of a second playback speed of the set of audio frames to the second device, at  908 . For example, the frame loss manager  156 , based at least in part on determining that the set of audio frames  113  that is subsequent to the audio frame  111  is available, initiates transmission of the set of audio frames  113  (e.g., the set of audio frames  123  is the same as the set of audio frames  113 ) and an indication of the second playback speed  115 , as described with reference to  FIG. 1 . The second playback speed  115  is greater than the first playback speed  105  of the set of audio frames  109  of the sequence  119 . The method  900  thus enables retransmitting previously lost audio frames and enabling the device  102  to catch up to a call by playing out audio frames at a faster playback speed. 
     The method  900  of  FIG. 9  may be implemented by a field-programmable gate array (FPGA) device, an application-specific integrated circuit (ASIC), a processing unit such as a central processing unit (CPU), a DSP, a controller, another hardware device, firmware device, or any combination thereof. As an example, the method  900  of  FIG. 9  may be performed by one or more processors that execute instructions, such as described with reference to  FIG. 21 . 
     Referring to  FIG. 10 , a particular implementation of a method  1000  of call audio playback speed adjustment is shown. In a particular aspect, one or more operations of the method  1000  are performed by at least one of the frame loss manager  156 , the call manager  152 , the one or more processors  150 , the device  104 , the system  100  of  FIG. 1 , the system  200  of  FIG. 2 , the system  300  of  FIG. 3 , or a combination thereof. 
     The method  1000  includes initiating transmission of a sequence of audio frames to a second device during a call, at  1002 . For example, the device  104  of  FIG. 1  initiates transmission of the sequence  119  of audio frames to the device  102  during a call, as described with reference to  FIG. 1 . 
     The method  1000  also includes receiving a frame loss indication from the second device, at  1004 . For example, the frame loss manager  156  of  FIG. 1  receives the frame loss indication  121  from the device  102 , as described with reference to  FIG. 1 . 
     The method  1000  further includes determining, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device, at  1006 . For example, the frame loss manager  156  of  FIG. 1  determines, based on the frame loss indication  121 , a last received audio frame (e.g., the audio frame  111 ) of the sequence  119  that was received by the device  102 , as described with reference to  FIG. 1 . 
     The method  1000  also includes, based at least in part on determining that a set of audio frames that is subsequent to the last received audio frame in the sequence is available, generating an updated set of audio frames based on the set of audio frames so that a first playback speed of the updated set of audio frames corresponds to an effective second playback speed of the set of audio frames, at  1008 . For example, the frame loss manager  156 , based at least in part on determining that the set of audio frames  113  that is subsequent to the audio frame  111  is available, generates the set of audio frames  123  based on a subset of the set of audio frames  113  so that the first playback speed  105  of the set of audio frames  123  corresponds to an effective playback speed (e.g., the second playback speed  115 ) of the set of audio frames  113 , as described with reference to  FIG. 1 . The effective second playback speed (e.g., the second playback speed  115 ) is greater than the first playback speed  105 . The method  1000  thus enables transmission of audio frames corresponding to lost audio frames that have a faster effective playback speed to catch up to a call. 
     The method  1000  of  FIG. 10  may be implemented by a field-programmable gate array (FPGA) device, an application-specific integrated circuit (ASIC), a processing unit such as a central processing unit (CPU), a DSP, a controller, another hardware device, firmware device, or any combination thereof. As an example, the method  1000  of  FIG. 10  may be performed by one or more processors that execute instructions, such as described with reference to  FIG. 21 . 
     Referring to  FIG. 11 , a particular implementation of a method  1100  of call audio playback speed adjustment is shown. In a particular aspect, one or more operations of the method  1100  are performed by at least one of the frame loss manager  124 , the call manager  122 , the one or more processors  120 , the device  102 , the system  100  of  FIG. 1 , the pause manager  624 , the system  600  of  FIG. 6 , or a combination thereof. 
     The method  1100  includes receiving a sequence of audio frames from a first device during a call, at  1102 . For example, the device  102  receives the sequence  119  of audio frames from the device  104  during a call, as described with reference to  FIG. 1 . 
     The method  1100  also includes, in response to receiving a user request to resume playback and determining that a set of audio frames that is subsequent to a last played audio frame in the sequence is available, initiating playback of the set of audio frames based on a second playback speed, at  1104 . For example, the pause manager  624  of  FIG. 6 , in response to receiving the resume command  622  indicating a user request to resume playback and determining that the set of audio frames  113  that is subsequent to a last played audio frame (e.g., the audio frame  111 ) is available, initiates playback of the set of audio frames  113  based on the second playback speed  115 , as described with reference to  FIG. 6 . The second playback speed  115  is greater than a first playback speed  105  of the set of audio frames  109  of the sequence  119 . 
     The method  1100  thus enables a user to pause a call (e.g., a real-time call). The user can resume the call and catch up to the conversation without having to ask other participants to repeat what was missed. 
     The method  1100  of  FIG. 11  may be implemented by a field-programmable gate array (FPGA) device, an application-specific integrated circuit (ASIC), a processing unit such as a central processing unit (CPU), a DSP, a controller, another hardware device, firmware device, or any combination thereof. As an example, the method  1100  of  FIG. 11  may be performed by one or more processors that execute instructions, such as described with reference to  FIG. 21 . 
       FIG. 12  depicts an implementation  1200  of the device  102 , the device  104  of  FIG. 1 , the server  204  of  FIG. 2 , or a combination thereof, as an integrated circuit  1202  that includes one or more processors  1220 . The one or more processors  1220  include a call manager  1222 , a frame loss manager  1224 , the pause manager  624 , or a combination thereof. 
     In a particular aspect, the call manager  1222  corresponds to the call manager  122 , the call manager  152  of  FIG. 1 , the call manager  222  of  FIG. 2 , or a combination thereof. In a particular aspect, the frame loss manager  1224  corresponds to the frame loss manager  124 , the frame loss manager  156  of  FIG. 1 , the frame loss manager  224  of  FIG. 2 , or a combination thereof. 
     The integrated circuit  1202  also includes an audio input  1204 , such as one or more bus interfaces, to enable the audio data  1228  (e.g., the audio input  141 ) to be received for processing. The integrated circuit  1202  also includes an audio output  1206 , such as a bus interface, to enable sending of an audio output  1243 , such as the audio output  143 . The integrated circuit  1202  enables implementation of call audio playback speed adjustment as a component in a system, such as a mobile phone or tablet as depicted in  FIG. 13 , a headset as depicted in  FIG. 14 , a wearable electronic device as depicted in  FIG. 15 , a voice-controlled speaker system as depicted in  FIG. 16 , a camera as depicted in  FIG. 17 , a virtual reality headset or an augmented reality headset as depicted in  FIG. 18 , or a vehicle as depicted in  FIG. 19  or  FIG. 20 . 
       FIG. 13  depicts an implementation  1300  in which the device  102 , the device  104 , the server  204 , or a combination thereof, includes a mobile device  1302 , such as a phone or tablet, as illustrative, non-limiting examples. The mobile device  1302  includes the speaker  129 , the microphone  146 , and a display screen  1304 . Components of the processor  1220 , including the call manager  1222 , the frame loss manager  1224 , the pause manager  624 , or a combination thereof, are integrated in the mobile device  1302  and are illustrated using dashed lines to indicate internal components that are not generally visible to a user of the mobile device  1302 . In a particular example, the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , or a combination thereof, operate to adjust call audio playback speed of user speech, which is then processed to perform one or more operations at the mobile device  1302 , such as display information associated with the user&#39;s speech at the display screen  1304  (e.g., via an integrated “smart assistant” application). 
       FIG. 14  depicts an implementation  1400  in which the device  102 , the device  104 , the server  204 , or a combination thereof, includes a headset device  1402 . The headset device  1402  includes the speaker  129 , the microphone  146 , or both. Components of the one or more processors  1220 , including the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , or a combination thereof, are integrated in the headset device  1402 . In a particular example, the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , or a combination thereof, operate to adjust call audio playback speed of user speech, which may cause the headset device  1402  to perform one or more operations at the headset device  1402 , to transmit audio data corresponding to user voice activity to a second device (not shown), for further processing, or a combination thereof. 
       FIG. 15  depicts an implementation  1500  in which the device  102 , the device  104 , the server  204 , or a combination thereof, includes a wearable electronic device  1502 , illustrated as a “smart watch.” The frame loss manager  1224 , the pause manager  624 , the call manager  1222 , the microphone  146 , the speaker  129 , or a combination thereof, are integrated into the wearable electronic device  1502 . In a particular example, the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , or a combination thereof, operate to adjust call audio playback speed of user speech, which is then processed to perform one or more operations at the wearable electronic device  1502 , such as to launch a graphical user interface or otherwise display other information associated with the user&#39;s speech at a display screen  1504  of the wearable electronic device  1502 . To illustrate, the wearable electronic device  1502  may include a display screen that is configured to display a notification based on user speech detected by the wearable electronic device  1502 . In a particular example, the wearable electronic device  1502  includes a haptic device that provides a haptic notification (e.g., vibrates) in response to detection of user voice activity. For example, the haptic notification can cause a user to look at the wearable electronic device  1502  to see a displayed notification indicating detection of a keyword spoken by the user (e.g., to pause or resume playback of call), or an alert indicating that call audio is being played in a catch up mode (e.g., increased speed). The wearable electronic device  1502  can thus alert a user with a hearing impairment or a user wearing a headset that the user&#39;s voice activity is detected. 
       FIG. 16  is an implementation  1600  in which the device  102 , the device  104 , the server  204 , or a combination thereof, includes a wireless speaker and voice activated device  1602 . The wireless speaker and voice activated device  1602  can have wireless network connectivity and is configured to execute an assistant operation. The one or more processors  1220  including the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , the microphone  146 , the speaker  129 , or a combination thereof, are included in the wireless speaker and voice activated device  1602 . In a particular example, the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , or a combination thereof, operate to adjust call audio playback speed of user speech. During operation, in response to receiving a verbal command identified as user speech, the wireless speaker and voice activated device  1602  can execute assistant operations, such as via execution of a voice activation system (e.g., an integrated assistant application). The assistant operations can include pausing a call, resuming a paused call with an increased playback speed to catch up, adjusting a temperature, playing music, turning on lights, etc. For example, the assistant operations are performed responsive to receiving a command after a keyword or key phrase (e.g., “hello assistant”). 
       FIG. 17  depicts an implementation  1700  in which the device  102 , the device  104 , the server  204 , or a combination thereof, includes a portable electronic device that corresponds to a camera device  1702 . The frame loss manager  1224 , the pause manager  624 , the call manager  1222 , the microphone  146 , the speaker  129 , or a combination thereof, are included in the camera device  1702 . In a particular example, the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , or a combination thereof, operate to adjust call audio playback speed of user speech. During operation, in response to receiving a verbal command identified as user speech, the camera device  1702  can execute operations responsive to spoken user commands, such as to adjust image or video capture settings, image or video playback settings, or image or video capture instructions, as illustrative examples. 
       FIG. 18  depicts an implementation  1800  in which the device  102 , the device  104 , the server  204 , or a combination thereof, includes a portable electronic device that corresponds to a virtual reality, augmented reality, or mixed reality headset  1802 . The frame loss manager  1224 , the pause manager  624 , the call manager  1222 , the microphone  146 , the speaker  129 , or a combination thereof, are integrated into the headset  1802 . In a particular example, the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , or a combination thereof, operate to adjust call audio playback speed of user speech. A visual interface device  1820  is positioned in front of the user&#39;s eyes to enable display of augmented reality or virtual reality images or scenes to the user while the headset  1802  is worn. In a particular example, the visual interface device is configured to display a notification indicating detected user speech. 
       FIG. 19  depicts an implementation  1900  in which the device  102 , the device  104 , the server  204 , or a combination thereof, corresponds to, or is integrated within, a vehicle  1902 , illustrated as a manned or unmanned aerial device (e.g., a package delivery drone). The frame loss manager  1224 , the pause manager  624 , the call manager  1222 , the microphone  146 , the speaker  129 , or a combination thereof, are integrated into the vehicle  1902 . In a particular example, the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , or a combination thereof, operate to adjust call audio playback speed of user speech, such as for delivery instructions from an authorized user of the vehicle  1902 . 
       FIG. 20  depicts another implementation  2000  in which the device  102 , the device  104 , the server  204 , or a combination thereof, corresponds to, or is integrated within, a vehicle  2002 , illustrated as a car. The vehicle  2002  includes the one or more processor  1220  including the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , or a combination thereof. The vehicle  2002  also includes the microphone  146 , the speaker  129 , or both. In a particular example, the frame loss manager  1224 , the pause manager  624 , the call manager  1222 , or a combination thereof, operate to adjust call audio playback speed of user speech, such as for a voice command from an authorized passenger. In a particular implementation, in response to receiving a verbal command identified as user speech, a voice activation system initiates one or more operations of the vehicle  2002  based on one or more keywords (e.g., “unlock,” “start engine,” “play music,” “display weather forecast,” or another voice command), such as by providing feedback or information via a display  2020  or one or more speakers (e.g., the speaker  129 ). 
     Referring to  FIG. 21 , a block diagram of a particular illustrative implementation of a device is depicted and generally designated  2100 . In various implementations, the device  2100  may have more or fewer components than illustrated in  FIG. 21 . In an illustrative implementation, the device  2100  may correspond to the device  102 , the device  104 , the server  204 , or a combination thereof. In an illustrative implementation, the device  2100  may perform one or more operations described with reference to  FIGS. 1-20 . 
     In a particular implementation, the device  2100  includes a processor  2106  (e.g., a central processing unit (CPU)). The device  2100  may include one or more additional processors  2110  (e.g., one or more DSPs). In a particular aspect, the one or more processors  1220  of  FIG. 12  correspond to the processor  2106 , the processors  2110 , or a combination thereof. The processors  2110  may include a speech and music coder-decoder (CODEC)  2108  that includes a voice coder (“vocoder”) encoder  2136 , a vocoder decoder  2138 , the call manager  1222 , the frame loss manager  1224 , the pause manager  624 , or a combination thereof. 
     The device  2100  may include a memory  2186  and a CODEC  2134 . In a particular aspect, the memory  2186  corresponds to the memory  154 , the memory  132  of  FIG. 1 , the memory  232  of  FIG. 2 , or a combination thereof. The memory  2186  may include instructions  2156 , that are executable by the one or more additional processors  2110  (or the processor  2106 ) to implement the functionality described with reference to the call manager  1222 , the frame loss manager  1224 , the pause manager  624 , or a combination thereof. The device  2100  may include a modem  2140  coupled, via a transceiver  2150 , to an antenna  2152 . 
     The device  2100  may include a display  2128  coupled to a display controller  2126 . The speaker  129 , the microphone  146 , or both, may be coupled to the CODEC  2134 . The CODEC  2134  may include a digital-to-analog converter (DAC)  2102 , an analog-to-digital converter (ADC)  2104 , or both. In a particular implementation, the CODEC  2134  may receive analog signals from the microphone  146 , convert the analog signals to digital signals using the analog-to-digital converter  2104 , and provide the digital signals to the speech and music codec  2108 . The speech and music codec  2108  may process the digital signals, and the digital signals may further be processed by the call manager  1222 . In a particular implementation, the speech and music codec  2108  may provide digital signals to the CODEC  2134 . The CODEC  2134  may convert the digital signals to analog signals using the digital-to-analog converter  2102  and may provide the analog signals to the speaker  129 . 
     In a particular implementation, the device  2100  may be included in a system-in-package or system-on-chip device  2122 . In a particular implementation, the memory  2186 , the processor  2106 , the processors  2110 , the display controller  2126 , the CODEC  2134 , the modem  2140 , and the transceiver  2150  are included in a system-in-package or system-on-chip device  2122 . In a particular implementation, an input device  2130  and a power supply  2144  are coupled to the system-on-chip device  2122 . Moreover, in a particular implementation, as illustrated in  FIG. 21 , the display  2128 , the input device  2130 , the speaker  129 , the microphone  146 , the antenna  2152 , and the power supply  2144  are external to the system-on-chip device  2122 . In a particular implementation, each of the display  2128 , the input device  2130 , the speaker  129 , the microphone  146 , the antenna  2152 , and the power supply  2144  may be coupled to a component of the system-on-chip device  2122 , such as an interface or a controller. 
     The device  2100  may include a virtual assistant, a home appliance, a smart device, an internet of things (IoT) device, a communication device, a computer, a display device, a television, a gaming console, a music player, a radio, a video player, an entertainment unit, a personal media player, a digital video player, a camera, a navigation device, a headset, a smart speaker, a speaker bar, a mobile communication device, a smart phone, a cellular phone, a laptop computer, a tablet, a personal digital assistant, a digital video disc (DVD) player, a tuner, a vehicle, an augmented reality headset, a virtual reality headset, a mixed reality headset, an aerial vehicle, a home automation system, a voice-activated device, a wireless speaker and voice activated device, a portable electronic device, a car, a computing device, a virtual reality (VR) device, a base station, a mobile device, or any combination thereof. 
     In conjunction with the described implementations, an apparatus includes means for receiving a sequence of audio frames during a call from a first device. For example, the means for receiving can correspond to the frame loss manager  124 , the call manager  122 , the one or more processors  120 , the device  102  of  FIG. 1 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the transceiver  2150 , the modem  2140 , the antenna  2152 , the device  2100 , one or more other circuits or components configured to receive a sequence of audio frames during a call, or any combination thereof. 
     The apparatus also includes means for initiating transmission of a frame loss indication to the first device, the transmission initiated in response to determining that no audio frame of the sequence has been received for a threshold duration since a last received audio frame of the sequence. For example, the means for initiating transmission of a frame loss indication can correspond to the frame loss manager  124 , the call manager  122 , the one or more processors  120 , the device  102  of  FIG. 1 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the transceiver  2150 , the modem  2140 , the antenna  2152 , the device  2100 , one or more other circuits or components configured to initiate transmission of a frame loss indication, or any combination thereof. 
     The apparatus further includes means for receiving a set of audio frames of the sequence and an indication of a second playback speed from the first device, the set of audio frames and the indication received responsive to the frame loss indication. For example, the means for receiving a set of audio frames can correspond to the frame loss manager  124 , the call manager  122 , the one or more processors  120 , the device  102  of  FIG. 1 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the transceiver  2150 , the modem  2140 , the antenna  2152 , the device  2100 , one or more other circuits or components configured to receive a set of audio frames, or any combination thereof. 
     The apparatus also includes means for initiating playback, via a speaker, of the set of audio frames based on the second playback speed, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. For example, the means for initiating playback can correspond to the frame loss manager  124 , the call manager  122 , the one or more processors  120 , the device  102  of  FIG. 1 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the processor  2106 , the one or more processors  2110 , the device  2100 , one or more other circuits or components configured to initiate transmission of a frame loss indication, or any combination thereof. 
     Also in conjunction with the described implementations, an apparatus includes means for receiving a sequence of audio frames from a first device. For example, the means for receiving can correspond to the frame loss manager  124 , the call manager  122 , the one or more processors  120 , the device  102  of  FIG. 1 , the pause manager  624  of  FIG. 6 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the transceiver  2150 , the modem  2140 , the antenna  2152 , the device  2100 , one or more other circuits or components configured to receive a sequence of audio frames during a call, or any combination thereof. 
     The apparatus also includes means for initiating playback of a set of audio frames at least at a second playback speed in response to receiving a user request to resume playback and determining that the set of audio frames that is subsequent to a last played audio frame in the sequence is available, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. For example, the means for initiating playback can correspond to the frame loss manager  124 , the call manager  122 , the one or more processors  120 , the device  102  of  FIG. 1 , the pause manager  624  of  FIG. 6 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the device  2100 , one or more other circuits or components configured to initiate playback of a set of audio frames, or any combination thereof. 
     Further in conjunction with the described implementations, an apparatus includes means for initiating transmission of a sequence of audio frames to a second device during a call. For example, the means for initiating transmission can correspond to the frame loss manager  156 , the call manager  152 , the one or more processors  150 , the device  104  of  FIG. 1 , the call manager  222 , the frame loss manager  224 , the one or more processors  220 , the server  204  of  FIG. 2 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the transceiver  2150 , the modem  2140 , the antenna  2152 , the device  2100 , one or more other circuits or components configured to initiate transmission of a sequence of audio frames, or any combination thereof. 
     The apparatus also includes means for receiving a frame loss indication from the second device. For example, the means for receiving can correspond to the frame loss manager  156 , the call manager  152 , the one or more processors  150 , the device  104  of  FIG. 1 , the call manager  222 , the frame loss manager  224 , the one or more processors  220 , the server  204  of  FIG. 2 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the transceiver  2150 , the modem  2140 , the antenna  2152 , the device  2100 , one or more other circuits or components configured to receive a frame loss indication, or any combination thereof. 
     The apparatus further includes means for determining, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device. For example, the means for determining can correspond to the frame loss manager  156 , the call manager  152 , the one or more processors  150 , the device  104  of  FIG. 1 , the call manager  222 , the frame loss manager  224 , the one or more processors  220 , the server  204  of  FIG. 2 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the device  2100 , one or more other circuits or components configured to determine, based on the frame loss indication, a last received audio frame, or any combination thereof. 
     The apparatus also includes means for initiating transmission of a set of audio frames and an indication of a second playback speed of the set of audio frames to the second device, the transmission initiated based at least in part on determining that the set of audio frames that is subsequent to the last received audio frame in the sequence is available. The second playback speed is greater than a first playback speed of a first set of audio frames of the sequence. For example, the means for initiating transmission can correspond to the frame loss manager  156 , the call manager  152 , the one or more processors  150 , the device  104  of  FIG. 1 , the call manager  222 , the frame loss manager  224 , the one or more processors  220 , the server  204  of  FIG. 2 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the transceiver  2150 , the modem  2140 , the antenna  2152 , the device  2100 , one or more other circuits or components configured to initiate transmission of a set of audio frames, or any combination thereof. 
     Also in conjunction with the described implementations, an apparatus includes means for initiating transmission of a sequence of audio frames to a second device during a call. For example, the means for initiating transmission can correspond to the frame loss manager  156 , the call manager  152 , the one or more processors  150 , the device  104  of  FIG. 1 , the call manager  222 , the frame loss manager  224 , the one or more processors  220 , the server  204  of  FIG. 2 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the transceiver  2150 , the modem  2140 , the antenna  2152 , the device  2100 , one or more other circuits or components configured to initiate transmission of a sequence of audio frames, or any combination thereof. 
     The apparatus also includes means for receiving a frame loss indication from the second device. For example, the means for receiving can correspond to the frame loss manager  156 , the call manager  152 , the one or more processors  150 , the device  104  of  FIG. 1 , the call manager  222 , the frame loss manager  224 , the one or more processors  220 , the server  204  of  FIG. 2 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the transceiver  2150 , the modem  2140 , the antenna  2152 , the device  2100 , one or more other circuits or components configured to receive a frame loss indication, or any combination thereof. 
     The apparatus further includes means for determining, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device. For example, the means for determining can correspond to the frame loss manager  156 , the call manager  152 , the one or more processors  150 , the device  104  of  FIG. 1 , the call manager  222 , the frame loss manager  224 , the one or more processors  220 , the server  204  of  FIG. 2 , the one or more processors  1220 , the call manager  1222 , the frame loss manager  1224  of  FIG. 12 , the device  2100 , one or more other circuits or components configured to determine, based on the frame loss indication, a last received audio frame, or any combination thereof. 
     The apparatus also includes means for generating an updated set of audio frames based on a set of audio frames so that a first playback speed of the updated set of audio frames corresponds to an effective second playback speed of the set of audio frames, the updated set of audio frames generated based at least in part on determining that the set of audio frames that is subsequent to the last received audio frame in the sequence is available. The effective second playback speed is greater than the first playback speed. For example, the means for generating can correspond to the frame loss manager  156 , the one or more processors  150 , the device  104  of  FIG. 1 , the frame loss manager  224 , the one or more processors  220 , the server  204  of  FIG. 2 , the one or more processors  1220 , the frame loss manager  1224  of  FIG. 12 , the transceiver  2150 , the modem  2140 , the antenna  2152 , the device  2100 , one or more other circuits or components configured to generate an updated set of audio frames, or any combination thereof. 
     In some implementations, a non-transitory computer-readable medium (e.g., a computer-readable storage device, such as the memory  2186 ) includes instructions (e.g., the instructions  2156 ) that, when executed by one or more processors (e.g., the one or more processors  2110  or the processor  2106 ), cause the one or more processors to receive a sequence (e.g., the sequence  119 ) of audio frames from a first device (e.g., the device  104 ) during a call. The instructions, when executed by the one or more processors, also cause the one or more processors to, in response to determining that no audio frame of the sequence has been received for a threshold duration since a last received audio frame (e.g., the audio frame  111 ) of the sequence, initiate transmission of a frame loss indication (e.g., the frame loss indication  121 ) to the first device. The instructions, when executed by the one or more processors, further cause the one or more processors to, responsive to the frame loss indication, receive a set of audio frames (e.g., the set of audio frames  113 ) of the sequence and an indication of a second playback speed (e.g., the second playback speed  115 ) from the first device. The instructions, when executed by the one or more processors, also cause the one or more processors to initiate playback, via a speaker (e.g., the speaker  129 ), of the set of audio frames based on the second playback speed. The second playback speed is greater than a first playback speed (e.g., the first playback speed  105 ) of a first set of audio frames (e.g., the set of audio frames  109 ) of the sequence. 
     In some implementations, a non-transitory computer-readable medium (e.g., a computer-readable storage device, such as the memory  2186 ) includes instructions (e.g., the instructions  2156 ) that, when executed by one or more processors (e.g., the one or more processors  2110  or the processor  2106 ), cause the one or more processors to receive a sequence (e.g., the sequence  119 ) of audio frames from a first device (e.g., the device  104 ) during a call. The instructions, when executed by the one or more processors, also cause the one or more processors to, in response to receiving a user request (e.g., the resume command  622 ) to resume playback and determining that a set of audio frames (e.g., the set of audio frames  113 ) that is subsequent to a last played audio frame (e.g., the audio frame  111 ) in the sequence is available, initiate playback of the set of audio frames based on a second playback speed (e.g., the second playback speed  115 ). The second playback speed greater than a first playback speed (e.g., the first playback speed  105 ) of a first set of audio frames (e.g., the set of audio frames  109 ) of the sequence. 
     In some implementations, a non-transitory computer-readable medium (e.g., a computer-readable storage device, such as the memory  2186 ) includes instructions (e.g., the instructions  2156 ) that, when executed by one or more processors (e.g., the one or more processors  2110  or the processor  2106 ), cause the one or more processors to initiate transmission of a sequence (e.g., the sequence  119 ) of audio frames to a second device (e.g., the device  102 ) during a call. The instructions, when executed by the one or more processors, also cause the one or more processors to receive a frame loss indication (e.g., the frame loss indication  121 ) from the second device (e.g., the device  102 ). The instructions, when executed by the one or more processors, further cause the one or more processors to determine, based on the frame loss indication, a last received audio frame (e.g., the audio frame  111 ) of the sequence that was received by the second device. The instructions, when executed by the one or more processors, also cause the one or more processors to, based at least in part on determining that a set of audio frames (e.g., the set of audio frames  113 ) that is subsequent to the last received audio frame in the sequence is available, initiate transmission of the set of audio frames and an indication of a second playback speed (e.g., the second playback speed  115 ) of the set of audio frames to the second device. The second playback speed is greater than a first playback speed (e.g., the first playback speed  105 ) of a first set of audio frames (e.g., the set of audio frames  109 ) of the sequence. 
     In some implementations, a non-transitory computer-readable medium (e.g., a computer-readable storage device, such as the memory  2186 ) includes instructions (e.g., the instructions  2156 ) that, when executed by one or more processors (e.g., the one or more processors  2110  or the processor  2106 ), cause the one or more processors to initiate transmission of a sequence (e.g., the sequence  119 ) of audio frames to a second device (e.g., the device  102 ) during a call. The instructions, when executed by the one or more processors, also cause the one or more processors to receive a frame loss indication (e.g., the frame loss indication  121 ) from the second device (e.g., the device  102 ). The instructions, when executed by the one or more processors, further cause the one or more processors to determine, based on the frame loss indication, a last received audio frame (e.g., the audio frame  111 ) of the sequence that was received by the second device. The instructions, when executed by the one or more processors, also cause the one or more processors to, based at least in part on determining that a set of audio frames (e.g., the set of audio frames  113 ) that is subsequent to the last received audio frame in the sequence is available, generate an updated set of audio frames (e.g., the set of audio frames  123 ) based on the set of audio frames so that a first playback speed (e.g., the first playback speed  105 ) of the updated set of audio frames corresponds to an effective second playback speed (e.g., the second playback speed  115 ) of the set of audio frames. The effective second playback speed is greater than the first playback speed. 
     Particular aspects of the disclosure are described below in a first set of interrelated clauses: 
     According to Clause 1, a device for communication comprises one or more processors configured to, during a call: receive a sequence of audio frames from a first device; in response to determining that no audio frame of the sequence has been received for a threshold duration since a last received audio frame of the sequence, initiate transmission of a frame loss indication to the first device; responsive to the frame loss indication, receive a set of audio frames of the sequence and an indication of a second playback speed from the first device; and initiate playback, via a speaker, of the set of audio frames based on the second playback speed, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 2 includes the device of Clause 1, wherein initiating playback of the set of audio frames at the second playback speed includes at least partially suppressing silence indicated by the set of audio frames. 
     Clause 3 includes the device of Clause 1 or Clause 2, wherein the one or more processors are further configured to: receive next audio frames of the sequence from the first device, the next audio frames subsequent to the set of audio frames in the sequence; and transition playback of the next audio frames from the second playback speed to the first playback speed. 
     Clause 4 includes the device of any of Clause 1 to Clause 3, wherein the one or more processors are further configured to: store the set of audio frames in a buffer; receive next audio frames of the sequence from the first device and store the next audio frames in the buffer, the next audio frames subsequent to the set of audio frames in the sequence; and transition playback from the second playback speed to the first playback speed in response to determining that fewer than a threshold count of audio frames of the sequence are stored in the buffer for playback. 
     Clause 5 includes the device of any of Clause 1 to Clause 4, wherein the one or more processors are further configured to receive next audio frames of the sequence from the first device concurrently with receiving the set of audio frames from the first device, the next audio frames subsequent to the set of audio frames in the sequence. 
     Clause 6 includes the device of any of Clause 1 to Clause 5, wherein the one or more processors are configured to determine, at a particular time, that audio frames corresponding to a particular playback duration at the first playback speed have not been received since the last received audio frame, wherein the particular playback duration is based on the particular time and a receipt time of the last received frame, and wherein the frame loss indication includes a request to retransmit previous audio frames corresponding to the particular playback duration at the first playback speed. 
     Clause 7 includes the device of any of Clause 1 to Clause 6, wherein the frame loss indication indicates the last received audio frame. 
     Clause 8 includes the device of any of Clause 1 to Clause 6, wherein the second playback speed is based on a count of the set of audio frames. 
     Clause 9 includes the device of any of Clause 1 to Clause 8, wherein the one or more processors are configured to, in response to determining that the set of audio frames includes a silence frame, initiate playback of the silence frame at a greater playback speed than the second playback speed. 
     Clause 10 includes the device of any of Clause 1 to Clause 9, wherein the one or more processors are integrated into at least one of a virtual assistant, a home appliance, a smart device, an internet of things (IoT) device, a communication device, a computer, a display device, a television, a gaming console, a music player, a radio, a video player, an entertainment unit, a personal media player, a digital video player, a camera, a navigation device, a headset, or a combination thereof. 
     Particular aspects of the disclosure are described below in a second set of interrelated clauses: 
     According to Clause 11, a method of communication comprises, during a call: receiving, at a device, a sequence of audio frames from a first device; in response to determining that no audio frame of the sequence has been received at the device for a threshold duration since a last received audio frame of the sequence, initiating transmission of a frame loss indication from the device to the first device; responsive to the frame loss indication, receiving, at the device, a set of audio frames of the sequence and an indication of a second playback speed from the first device; and initiating playback, via a speaker, of the set of audio frames based on the second playback speed, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 12 includes the method of Clause 11, wherein the first device includes a server, wherein the call is with multiple second devices, and wherein the sequence of audio frames is based on multiple sequences of audio frames received by the first device from the multiple second devices. 
     Clause 13 includes the method of Clause 11, wherein the call is between the device and a single additional device, and wherein the single additional device includes the first device. 
     Clause 14 includes the method of any of Clauses 11 to 13, further comprising receiving next audio frames of the sequence at the device from the first device concurrently with receiving the set of audio frames at the device from the first device, the next audio frames subsequent to the set of audio frames in the sequence. 
     Particular aspects of the disclosure are described below in a third set of interrelated clauses: 
     According to Clause 15, a device for communication comprises: one or more processors configured to, during a call: receive a sequence of audio frames from a first device; and in response to receiving a user request to resume playback and determining that a set of audio frames that is subsequent to a last played audio frame in the sequence is available, initiate playback of the set of audio frames based on a second playback speed, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 16 includes the device of Clause 15, wherein initiating playback of the set of audio frames at the second playback speed includes at least partially suppressing silence indicated by the set of audio frames. 
     Clause 17 includes the device of Clause 15 or Clause 16, wherein the one or more processors are further configured to: receive next audio frames of the sequence from the first device, the next audio frames subsequent to the set of audio frames in the sequence; and transition playback of the next audio frames from the second playback speed to the first playback speed. 
     Clause 18 includes the device of any of Clause 15 to Clause 17, wherein the one or more processors are further configured to: store the set of audio frames in a buffer; receive next audio frames of the sequence from the first device and store the next audio frames in the buffer, the next audio frames subsequent to the set of audio frames in the sequence; and transition playback from the second playback speed to the first playback speed in response to determining that fewer than a threshold count of audio frames of the sequence are stored in the buffer for playback. 
     Clause 19 includes the device of any of Clause 15 to Clause 18, wherein the second playback speed is based on a count of the set of audio frames. 
     Clause 20 includes the device of any of Clause 15 to Clause 18, wherein the user request is received at a resume time, and wherein the second playback speed is based on a pause duration between a playback time of the last played audio frame and the resume time. 
     Clause 21 includes the device of any of Clause 15 to Clause 20, wherein the one or more processors are configured to, in response to determining that the set of audio frames includes a silence frame, initiate playback of the silence frame at a greater playback speed than the second playback speed. 
     Clause 22 includes the device of any of Clause 15 to Clause 21, wherein the one or more processors are integrated into at least one of a virtual assistant, a home appliance, a smart device, an internet of things (IoT) device, a communication device, a computer, a display device, a television, a gaming console, a music player, a radio, a video player, an entertainment unit, a personal media player, a digital video player, a camera, a navigation device, a headset, or a combination thereof. 
     Particular aspects of the disclosure are described below in a fourth set of interrelated clauses: 
     According to Clause 23, a method of communication comprises, during a call: receiving, at a device, a sequence of audio frames from a first device; and in response to receiving a user request to resume playback and determining that a set of audio frames that is subsequent to a last played audio frame in the sequence is available, initiating playback at the device of the set of audio frames at least at a second playback speed, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 24 includes the method of Clause 23, wherein initiating playback of the set of audio frames at the second playback speed includes at least partially suppressing silence indicated by the set of audio frames. 
     Clause 25 includes the method of Clause 23 or Clause 24, further comprising: receiving, at the device, next audio frames of the sequence from the first device, the next audio frames subsequent to the set of audio frames in the sequence; and transitioning, at the device, playback of the next audio frames from the second playback speed to the first playback speed. 
     Clause 26 includes the method of any of Clause 23 to Clause 25, further comprising: storing the set of audio frames in a buffer; receiving next audio frames of the sequence at the device from the first device; storing the next audio frames in the buffer, the next audio frames subsequent to the set of audio frames in the sequence; and transitioning, at the device, playback from the second playback speed to the first playback speed in response to determining that fewer than a threshold count of audio frames of the sequence are stored in the buffer for playback. 
     Clause 27 includes the method of any of Clause 23 to Clause 26, wherein the second playback speed is based on a count of the set of audio frames. 
     Clause 28 includes the method of any of Clause 23 to Clause 26, wherein the user request is received at a resume time, and wherein the second playback speed is based on a pause duration between a playback time of the last played audio frame and the resume time. 
     Clause 29 includes the method of any of Clause 23 to Clause 28, further comprising, in response to determining that the set of audio frames includes a silence frame, initiating at the device playback of the silence frame at a greater playback speed than the second playback speed. 
     Clause 30 includes the method of any of Clause 23 to Clause 29, wherein the first device includes a server, wherein the call is with multiple second devices, and wherein the sequence of audio frames is based on multiple sequences of audio frames received by the first device from the multiple second devices. 
     Particular aspects of the disclosure are described below in a fifth set of interrelated clauses: 
     According to Clause 31, a non-transitory computer-readable medium stores instructions that, when executed by one or more processors, causes the one or more processors to, during a call: receive a sequence of audio frames from a first device; in response to determining that no audio frame of the sequence has been received for a threshold duration since a last received audio frame of the sequence, initiate transmission of a frame loss indication to the first device; responsive to the frame loss indication, receive a set of audio frames of the sequence and an indication of a second playback speed from the first device; and initiate playback, via a speaker, of the set of audio frames based on the second playback speed, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 32 includes the non-transitory computer-readable medium of Clause 31, wherein initiating playback of the set of audio frames at the second playback speed includes at least partially suppressing silence indicated by the set of audio frames. 
     Particular aspects of the disclosure are described below in a sixth set of interrelated clauses: 
     According to Clause 33, a non-transitory computer-readable medium stores instructions that, when executed by one or more processors, causes the one or more processors to, during a call: receive a sequence of audio frames from a first device; and in response to receiving a user request to resume playback and determining that a set of audio frames that is subsequent to a last played audio frame in the sequence is available, initiate playback of the set of audio frames based on a second playback speed, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 34 includes the non-transitory computer-readable medium of Clause 33, wherein initiating playback of the set of audio frames at the second playback speed includes at least partially suppressing silence indicated by the set of audio frames. 
     Particular aspects of the disclosure are described below in a seventh set of interrelated clauses: 
     According to Clause 35, an apparatus comprises: means for receiving a sequence of audio frames during a call from a first device; means for initiating transmission of a frame loss indication to the first device, the transmission initiated in response to determining that no audio frame of the sequence has been received for a threshold duration since a last received audio frame of the sequence; means for receiving a set of audio frames of the sequence and an indication of a second playback speed from the first device, the set of audio frames and the indication received responsive to the frame loss indication; and means for initiating playback, via a speaker, of the set of audio frames based on the second playback speed, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 36 includes the apparatus of Clause 35, wherein the means for receiving the sequence, the means for initiating transmission of the frame loss indication, the means for receiving the set of audio frames, and the means for initiating playback are integrated into at least one of a virtual assistant, a home appliance, a smart device, an internet of things (IoT) device, a communication device, a computer, a display device, a television, a gaming console, a music player, a radio, a video player, an entertainment unit, a personal media player, a digital video player, a camera, a navigation device, a headset, or a combination thereof. 
     Particular aspects of the disclosure are described below in an eighth set of interrelated clauses: 
     According to Clause 37, an apparatus comprises: means for receiving a sequence of audio frames during a call from a first device; and means for initiating playback of a set of audio frames based on a second playback speed, the playback initiated in response to receiving a user request to resume playback and determining that the set of audio frames that is subsequent to a last played audio frame in the sequence is available, wherein the second playback speed is greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 38 includes the apparatus of Clause 37, wherein the means for receiving and the means for initiating playback are integrated into at least one of a virtual assistant, a home appliance, a smart device, an internet of things (IoT) device, a communication device, a computer, a display device, a television, a gaming console, a music player, a radio, a video player, an entertainment unit, a personal media player, a digital video player, a camera, a navigation device, a headset, or a combination thereof. 
     Particular aspects of the disclosure are described below in a ninth set of interrelated clauses: 
     According to Clause 39, a device for communication comprises: one or more processors configured to, during a call: initiate transmission of a sequence of audio frames to a second device; receive a frame loss indication from the second device; determine, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device; and based at least in part on determining that a set of audio frames that is subsequent to the last received audio frame in the sequence is available, initiate transmission of the set of audio frames and an indication of a second playback speed of the set of audio frames to the second device, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 40 includes the device of Clause 39, wherein the one or more processors are integrated into a server. 
     Clause 41 includes the device of Clause 39 or Clause 40, wherein the frame loss indication includes a request to retransmit previous audio frames corresponding to a particular playback duration at the first playback speed, wherein the one or more processors are configured to determine the last received audio frame based on the particular playback duration, and wherein the one or more processors are configured to initiate transmission of the set of audio frames based at least in part on determining that the previous audio frames include the set of audio frames. 
     Clause 42 includes the device of any of Clause 39 to Clause 41, further comprising a buffer, the one or more processors configured to receive the sequence of audio frames from a first device, wherein the transmission of the set of audio frames is initiated based at least in part on determining that the set of audio frames is available in the buffer. 
     Clause 43 includes the device of any of Clause 39 to Clause 42, wherein the one or more processors are further configured to initiate transmission of next audio frames of the sequence concurrently while transmitting the set of audio frames. 
     Clause 44 includes the device of Clause 43, wherein the next audio frames are associated with a transition to the first playback speed following playback of the set of audio frames at the second playback speed. 
     Clause 45 includes the device of any of Clause 39 to Clause 44, wherein the first set of audio frames is prior to the last received audio frame in the sequence. 
     Clause 46 includes the device of any of Clause 39 to Clause 45, wherein the one or more processors are configured to selectively initiate transmission of the set of audio frames in response to determining that a count of the set of audio frames is less than a threshold. 
     Clause 47 includes the device of any of Clause 39 to Clause 46, wherein the one or more processors are configured to determine the second playback speed based on a count of the set of audio frames. 
     Clause 48 includes the device of any of Clause 39 to Clause 47, wherein the one or more processors are configured to initiate the transmission of the set of audio frames based at least in part on determining that a network link is reestablished with the second device. 
     Clause 49 includes the device of any of Clause 39 to Clause 48, wherein the set of audio frames includes a silence frame, wherein the one or more processors are further configured to transmit an indication of a third playback speed for the silence frame, and wherein the third playback speed is greater than the second playback speed. 
     Particular aspects of the disclosure are described below in a tenth set of interrelated clauses: 
     According to clause 50, a device for communication comprises: one or more processors configured to, during a call: initiate transmission of a sequence of audio frames to a second device; receive a frame loss indication from the second device; determine, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device; and based at least in part on determining that a set of audio frames that is subsequent to the last received audio frame in the sequence is available, generate an updated set of audio frames based on the set of audio frames so that a first playback speed of the updated set of audio frames corresponds to an effective second playback speed of the set of audio frames, the effective second playback speed greater than the first playback speed. 
     Clause 51 includes the device of Clause 50, wherein the one or more processors are configured to generate the updated set of audio frames by selecting a subset of the set of audio frames such that the subset has the same playback duration at the first playback speed as the set of audio frames at the second playback speed. 
     Clause 52 includes the device of Clause 50 or Clause 51, wherein the one or more processors are integrated into a server. 
     Clause 53 includes the device of any of Clause 50 to Clause 52, wherein the frame loss indication includes a request to retransmit previous audio frames corresponding to a particular playback duration at the first playback speed, wherein the one or more processors are configured to determine the last received audio frame based on the particular playback duration, and wherein the one or more processors are configured to initiate transmission of the updated set of audio frames based at least in part on determining that the previous audio frames include the set of audio frames. 
     Clause 54 includes the device of any of Clause 50 to Clause 53, further comprising a buffer, the one or more processors configured to receive the sequence of audio frames from a first device, wherein the transmission of the updated set of audio frames is initiated based at least in part on determining that the set of audio frames is available in the buffer. 
     Clause 55 includes the device of any of Clause 50 to Clause 54, wherein the one or more processors are further configured to initiate transmission of next audio frames of the sequence concurrently while transmitting the updated set of audio frames. 
     Clause 56 includes the device of any of Clause 50 to Clause 55, wherein the one or more processors are configured to selectively initiate transmission of the updated set of audio frames in response to determining that a count of the set of audio frames is less than a threshold. 
     Clause 57 includes the device of any of Clause 50 to Clause 56, wherein the one or more processors are configured to determine the effective second playback speed based on a count of the set of audio frames. 
     Clause 58 includes the device of any of Clause 50 to Clause 57, wherein the one or more processors are configured to initiate the transmission of the updated set of audio frames based at least in part on determining that a network link is reestablished with the second device. 
     Clause 59 includes the device of any of Clause 50 to Clause 58, wherein generating the updated set of audio frames includes suppressing at least a portion of silence indicated in the set of audio frames. 
     Particular aspects of the disclosure are described below in an eleventh set of interrelated clauses: 
     According to Clause 61, a method of communication comprises, during a call: initiating transmission of a sequence of audio frames from a first device to a second device; receiving a frame loss indication at the first device from the second device; determining, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device; and based at least in part on determining that a set of audio frames that is subsequent to the last received audio frame in the sequence is available, initiating transmission of the set of audio frames and an indication of a second playback speed of the set of audio frames from the first device to the second device, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 62 includes the method of Clause 61, wherein the first device is integrated into a server. 
     Particular aspects of the disclosure are described below in a twelfth set of interrelated clauses: 
     According to clause 63, a method of communication comprises, during a call: initiating transmission of a sequence of audio frames to a second device; receiving a frame loss indication from the second device; determining, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device; and based at least in part on determining that a set of audio frames that is subsequent to the last received audio frame in the sequence is available, generating an updated set of audio frames based on the set of audio frames so that a first playback speed of the updated set of audio frames corresponds to an effective second playback speed of the set of audio frames, the effective second playback speed greater than the first playback speed. 
     Clause 64 includes the method of Clause 63, wherein generating the updated set of audio frames includes selecting a subset of the set of audio frames such that the subset has the same playback duration at the first playback speed as the set of audio frames at the second playback speed. 
     Particular aspects of the disclosure are described below in a thirteenth set of interrelated clauses: 
     According to Clause 65, a non-transitory computer-readable storage medium stores instructions that, when executed by one or more processors, cause the one or more processors to, during a call: initiate transmission of a sequence of audio frames to a second device; receive a frame loss indication from the second device; determine, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device; and based at least in part on determining that a set of audio frames that is subsequent to the last received audio frame in the sequence is available, initiate transmission of the set of audio frames and an indication of a second playback speed of the set of audio frames to the second device, the second playback speed greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 66 includes the non-transitory computer-readable storage medium of Clause 65, wherein the one or more processors are integrated into a server. 
     Particular aspects of the disclosure are described below in a fourteenth set of interrelated clauses: 
     According to clause 67, a non-transitory computer-readable storage medium stores instructions that, when executed by one or more processors, cause the one or more processors to, during a call: initiate transmission of a sequence of audio frames to a second device; receive a frame loss indication from the second device; determining, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device; and based at least in part on determining that a set of audio frames that is subsequent to the last received audio frame in the sequence is available, generate an updated set of audio frames based on the set of audio frames so that a first playback speed of the updated set of audio frames corresponds to an effective second playback speed of the set of audio frames, the effective second playback speed greater than the first playback speed. 
     Clause 68 includes the non-transitory computer-readable storage medium of Clause 67, wherein generating the updated set of audio frames includes selecting a subset of the set of audio frames such that the subset has the same playback duration at the first playback speed as the set of audio frames at the second playback speed. 
     Particular aspects of the disclosure are described below in a fifteenth set of interrelated clauses: 
     According to Clause 69, an apparatus comprises: means for initiating transmission of a sequence of audio frames during a call to a second device; means for receiving a frame loss indication from the second device; means for determining, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device; and means for initiating transmission of a set of audio frames and an indication of a second playback speed of the set of audio frames to the second device, the transmission initiated based at least in part on determining that the set of audio frames that is subsequent to the last received audio frame in the sequence is available, wherein the second playback speed is greater than a first playback speed of a first set of audio frames of the sequence. 
     Clause 70 includes the apparatus of Clause 69, wherein the means for initiating transmission of the sequence of audio frames, the means for determining, and the means for initiating transmission of the set of audio frames and the indication are integrated into at least one of a virtual assistant, a home appliance, a smart device, an internet of things (IoT) device, a communication device, a computer, a display device, a television, a gaming console, a music player, a radio, a video player, an entertainment unit, a personal media player, a digital video player, a camera, a navigation device, a headset, or a combination thereof. 
     Particular aspects of the disclosure are described below in a sixteenth set of interrelated clauses: 
     According to clause 71, an apparatus comprises: means for initiating transmission of a sequence of audio frames during a call to a second device; means for receiving a frame loss indication from the second device; means for determining, based on the frame loss indication, a last received audio frame of the sequence that was received by the second device; and means for generating an updated set of audio frames based on a set of audio frames so that a first playback speed of the updated set of audio frames corresponds to an effective second playback speed of the set of audio frames, the updated set of audio frames generated based at least in part on determining that the set of audio frames that is subsequent to the last received audio frame in the sequence is available, wherein the effective second playback speed is greater than the first playback speed. 
     Clause 72 includes the apparatus of Clause 71, wherein the means for initiating transmission of the sequence of audio frames, the means for receiving the frame loss indication, the means for determining, and the means for generating the updated set of audio frames are integrated into at least one of a virtual assistant, a home appliance, a smart device, an internet of things (IoT) device, a communication device, a computer, a display device, a television, a gaming console, a music player, a radio, a video player, an entertainment unit, a personal media player, a digital video player, a camera, a navigation device, a headset, or a combination thereof. 
     Those of skill would further appreciate that the various illustrative logical blocks, configurations, modules, circuits, and algorithm steps described in connection with the implementations disclosed herein may be implemented as electronic hardware, computer software executed by one or more processors, or combinations of both. Various illustrative components, blocks, configurations, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or processor executable instructions depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, such implementation decisions are not to be interpreted as causing a departure from the scope of the present disclosure. 
     The steps of a method or algorithm described in connection with the implementations disclosed herein may be embodied directly in hardware, in a software module executed by one or more processors, or in a combination of the two. A software module may reside in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disk, a removable disk, a compact disc read-only memory (CD-ROM), or any other form of non-transient storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor may read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an application-specific integrated circuit (ASIC). The ASIC may reside in a computing device or a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a computing device or user terminal. 
     The previous description of the disclosed aspects is provided to enable a person skilled in the art to make or use the disclosed aspects. Various modifications to these aspects will be readily apparent to those skilled in the art, and the principles defined herein may be applied to other aspects without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein but is to be accorded the widest scope possible consistent with the principles and novel features as defined by the following claims.