# Patent

## Title
Room-corrected voice detection

## Abstract

A playback device may have a network interface configured to communicate with a network microphone device over a communication network. A processor of the playback device may comprise instructions, which when executed, cause the processor to obtain acoustics of an environment in which the playback device is located; identify a network microphone device; and send the acoustics to the network microphone device to cause the network microphone device to apply the acoustics to voice input received by the network microphone device.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of priority under 35 USC §119(e) to U.S. Provisional Application Ser. No. 62/298,410 filed on Feb. 22, 2016 and entitled “DEFAULT PLAYBACK DEVICE(S)”, U.S. Provisional Application Ser. No. 62/298,418 filed on Feb. 22, 2016 and entitled “AUDIO RESPONSE PLAYBACK”, U.S. Provisional Application Ser. No. 62/298,433 filed on Feb. 22, 2016 and entitled “ROOM-CORRECTED VOICE DETECTION”, U.S. Provisional Application Ser. No. 62/298,439 filed on Feb. 22, 2016 and entitled “CONTENT MIXING”, U.S. Provisional Application Ser. No. 62/298,425 filed on Feb. 22, 2016 and entitled “MUSIC SERVICE SELECTION”, U.S. Provisional Application Ser. No. 62/298,350 filed on Feb. 22, 2016 and entitled “METADATA EXCHANGE INVOLVING A NETWORKED PLAYBACK SYSTEM AND A NETWORKED MICROPHONE SYSTEM”, U.S. Provisional Application Ser. No. 62/298,388 filed on Feb. 22, 2016 and entitled “HANDLING OF LOSS OF PAIRING BETWEEN NETWORKED DEVICES”, U.S. Provisional Application Ser. No. 62/298,393 filed on Feb. 22, 2016 and entitled “ACTION BASED ON USER ID”, U.S. Provisional Application Ser. No. 62/312,350 filed on Mar. 23, 2016 and entitled “VOICE CONTROL OF A MEDIA PLAYBACK SYSTEM”, the contents each of which are herein incorporated by reference in their entireties.


FIELD OF THE DISCLOSURE
The disclosure is related to consumer goods and, more particularly, to methods, systems, products, features, services, and other elements directed to media playback or some aspect thereof.
BACKGROUND
Options for accessing and listening to digital audio in an out-loud setting were limited until in 2003, when SONOS, Inc. filed for one of its first patent applications, entitled “Method for Synchronizing Audio Playback between Multiple Networked Devices,” and began offering a media playback system for sale in 2005. The Sonos Wireless HiFi System enables people to experience music from many sources via one or more networked playback devices. Through a software control application installed on a smartphone, tablet, or computer, one can play audio in any room that has a networked playback device. Additionally, using the control device, for example, different songs can be streamed to each room with a playback device, rooms can be grouped together for synchronous playback, or the same song can be heard in all rooms synchronously.
Given the ever growing interest in digital media, there continues to be a need to develop consumer-accessible technologies to further enhance the listening experience.



BRIEF DESCRIPTION OF THE DRAWINGS
Features, aspects, and advantages of the presently disclosed technology may be better understood with regard to the following description, appended claims, and accompanying drawings where:
FIG. 1 shows an example playback system configuration in which certain embodiments may be practiced;
FIG. 2 shows a functional block diagram of an example playback device;
FIG. 3 shows a functional block diagram of an example control device;
FIG. 4 shows an example control device interface;
FIG. 5 shows an example network configuration in which certain embodiments may be practiced;
FIG. 6 shows a functional block diagram of an example network microphone device;
FIG. 7 is an example flow diagram related to providing acoustics of an environment to a network microphone device;
FIG. 8 is another example flow diagram related to providing acoustics of an environment to a network microphone device;
FIG. 9 is an example flow diagram related to interpreting voice input received by the network microphone device;
FIG. 10 is an example flow diagram related to determining acoustics of an environment; and
FIG. 11 is another example flow diagram related to applying directionality to audio content played by a playback device.



The drawings are for the purpose of illustrating example embodiments, but it is understood that the embodiments are not limited to the arrangements and instrumentality shown in the drawings.
DETAILED DESCRIPTION
I. Overview
Embodiments described herein relate to providing to a network microphone device acoustics of an environment in which the network microphone device operates. The network microphone device may use the acoustics of the environment in interpreting voice input received by the network microphone device.
The network microphone device may be a device which receives voice input, e.g., speech, via a microphone array and performs a function based on the voice input. For example, the network microphone device may receive a voice command. The network microphone device may interpret the voice command that is received. Then, the network microphone device may perform a function based on the voice command. As an example, the network microphone device may receive a voice command “Play ‘Track 1’ by ‘Artist 1’ from ‘Streaming Service 1’, determine that the voice input is a command to play audio content, and then facilitate playing the requested track 1 of audio by ‘Artist 1’ from ‘Streaming Service 1’. Other arrangements are also possible.
The environment in which the network microphone device operates may have certain acoustics. The acoustics define how sound travels within the environment. The acoustics of an environment may be determined in many ways. As one example, a playback device with a speaker and microphone may output test tones via the speaker, receive the test tones via the microphone, and analyze the received test tones to determine the acoustics of the environment. In another example, another network device (such as a control device, a first playback device, or even the network microphone device itself) may include a microphone that receives test tones output by the speaker of a second playback device, and analyzes the received test tones to determine the acoustics of the environment. The test tones may be audio sounds at different frequencies. These acoustics may be stored on the playback device or on a computing device in a communication network for use by the playback device in the playback of audio content.
In other examples, the acoustics may be inferred based on known characteristics of the environment such as a size of the room, height of the ceiling of a room, and furniture in the room. A database may store acoustics for rooms with different characteristics. The acoustics stored in the database may have been determined based on a previous analysis of the room with the particular characteristics. A user may input the characteristics of the room and the database may output the acoustics of the environment. The acoustics may also be stored for use by the playback device on the playback device itself or also in the database.
U.S. patent application Ser. No. 14/481,511, entitled “Playback Device Calibration”, Ser. No. 14/216,306 entitled “Audio Settings Based on Environment”, Ser. No. 14/805,140 entitled “Hybrid Test Tone for Space-Averaged Rom Audio Calibration Using a Moving Microphone”, and Ser. No. 14/825,961 entitled “Multi-Channel Pairing in Media System”, and U.S. Pat. No. 9,106,192 entitled “System and Method for Device Playback Calibration” also describe various examples for calibration of playback devices, the contents of which are each herein incorporated by reference in their entirety.
The network microphone device may typically process voice input via a microphone response. The microphone response is an indication of sensitivity of the microphone with respect to frequency. In embodiments, the network microphone device may also use the acoustics of the environment to process the voice input to correct for distortions in the voice input. This way the voice input can be better interpreted.
The playback device may provide the acoustics of the environment to the network microphone device. As a media playback system may have a plurality of playback devices, the playback device that provides the acoustics may be that which is closest to the network microphone device. As another example, the playback device that provides the acoustics may be that which is a same zone. In some instances, a playback device may be bonded (grouped or paired) with the network microphone device. The bond may indicate that the playback device and the network microphone device are in close proximity to each other, such as in a same room or zone, and/or playing content in synchrony. When the network microphone device is bonded with a playback device, the network microphone device may be arranged to receive the acoustics of the environment from the bonded playback device. Moreover, if the network microphone device is moved and bonded to another playback device, the other playback device it is bonded to may provide new acoustics for the environment which the network microphone device is in.
The network microphone device may use the acoustics of the environment in which it is in to improve its operation. For example, the network microphone device may define a filter based on the acoustics. The network microphone device may apply the filter to the voice input received by the network microphone device to correct for the acoustics of the environment, e.g., spectral, spatial, and temporal distortions in the voice input. This way the voice input can be better interpreted.
In many situations, the network microphone device may be placed in proximity to a media playback system. The media playback system may include a plurality of playback devices that play back audio content. These playback devices may be distributed in various locations within a home, and these locations may be referred to as zones such as a bedroom or living room of the home. As a result, the network microphone device may need to interpret voice input in the presence of audio content such as music also being played back by the media playback system.
In some situations, the playback device may provide to the network microphone device an indication of the content being played back such that the network microphone device may apply not only the filter to the voice input to correct for the acoustics of the environment but also use the audio content being played back to better isolate the voice input.
Additionally, or alternatively, the network microphone device may be capable of determining directionality of the voice input. The directionality may define a direction from which the voice input comes from. This directionality may be provided to the media playback system. The media playback system includes a plurality of speakers. The media playback system may use this directionality to adjust the audio output of the plurality of speakers. For example, the media playback system may direct the audio sound produced from one or more playback devices also in the direction of where the voice input comes from. This may be where a listener is located. Other arrangements are also possible.
II. Example Operating Environment
FIG. 1 shows an example configuration of a media playback system 100 in which one or more embodiments disclosed herein may be practiced or implemented. The media playback system 100 as shown is associated with an example home environment having several rooms and spaces, such as for example, a master bedroom, an office, a dining room, and a living room. As shown in the example of FIG. 1, the media playback system 100 includes playback devices 102-124, control devices 126 and 128, and a wired or wireless network router 130.
Further discussions relating to the different components of the example media playback system 100 and how the different components may interact to provide a user with a media experience may be found in the following sections. While discussions herein may generally refer to the example media playback system 100, technologies described herein are not limited to applications within, among other things, the home environment as shown in FIG. 1. For instance, the technologies described herein may be useful in environments where multi-zone audio may be desired, such as, for example, a commercial setting like a restaurant, mall or airport, a vehicle like a sports utility vehicle (SUV), bus or car, a ship or boat, an airplane, and so on.
a. Example Playback Devices
FIG. 2 shows a functional block diagram of an example playback device 200 that may be configured to be one or more of the playback devices 102-124 of the media playback system 100 of FIG. 1. The playback device 200 may include a processor 202, software components 204, memory 206, audio processing components 208, audio amplifier(s) 210, speaker(s) 212, a network interface 214 including wireless interface(s) 216 and wired interface(s) 218, and microphone(s) 220. In one case, the playback device 200 may not include the speaker(s) 212, but rather a speaker interface for connecting the playback device 200 to external speakers. In another case, the playback device 200 may include neither the speaker(s) 212 nor the audio amplifier(s) 210, but rather an audio interface for connecting the playback device 200 to an external audio amplifier or audio-visual receiver.
In one example, the processor 202 may be a clock-driven computing component configured to process input data according to instructions stored in the memory 206. The memory 206 may be a tangible computer-readable medium configured to store instructions executable by the processor 202. For instance, the memory 206 may be data storage that can be loaded with one or more of the software components 204 executable by the processor 202 to achieve certain functions. In one example, the functions may involve the playback device 200 retrieving audio data from an audio source or another playback device. In another example, the functions may involve the playback device 200 sending audio data to another device or playback device on a network. In yet another example, the functions may involve pairing of the playback device 200 with one or more playback devices to create a multi-channel audio environment.
Certain functions may involve the playback device 200 synchronizing playback of audio content with one or more other playback devices. During synchronous playback, a listener will preferably not be able to perceive time-delay differences between playback of the audio content by the playback device 200 and the one or more other playback devices. U.S. Pat. No. 8,234,395 entitled, “System and method for synchronizing operations among a plurality of independently clocked digital data processing devices,” which is hereby incorporated by reference, provides in more detail some examples for audio playback synchronization among playback devices.
The memory 206 may further be configured to store data associated with the playback device 200, such as one or more zones and/or zone groups the playback device 200 is a part of, audio sources accessible by the playback device 200, or a playback queue that the playback device 200 (or some other playback device) may be associated with. The data may be stored as one or more state variables that are periodically updated and used to describe the state of the playback device 200. The memory 206 may also include the data associated with the state of the other devices of the media system, and shared from time to time among the devices so that one or more of the devices have the most recent data associated with the system. Other embodiments are also possible.
The audio processing components 208 may include one or more digital-to-analog converters (DAC), an audio preprocessing component, an audio enhancement component or a digital signal processor (DSP), and so on. In one embodiment, one or more of the audio processing components 208 may be a subcomponent of the processor 202. In one example, audio content may be processed and/or intentionally altered by the audio processing components 208 to produce audio signals. The produced audio signals may then be provided to the audio amplifier(s) 210 for amplification and playback through speaker(s) 212. Particularly, the audio amplifier(s) 210 may include devices configured to amplify audio signals to a level for driving one or more of the speakers 212. The speaker(s) 212 may include an individual transducer (e.g., a “driver”) or a complete speaker system involving an enclosure with one or more drivers. A particular driver of the speaker(s) 212 may include, for example, a subwoofer (e.g., for low frequencies), a mid-range driver (e.g., for middle frequencies), and/or a tweeter (e.g., for high frequencies). In some cases, each transducer in the one or more speakers 212 may be driven by an individual corresponding audio amplifier of the audio amplifier(s) 210. In addition to producing analog signals for playback by the playback device 200, the audio processing components 208 may be configured to process audio content to be sent to one or more other playback devices for playback.
Audio content to be processed and/or played back by the playback device 200 may be received from an external source, such as via an audio line-in input connection (e.g., an auto-detecting 3.5 mm audio line-in connection) or the network interface 214.
The network interface 214 may be configured to facilitate a data flow between the playback device 200 and one or more other devices on a data network. As such, the playback device 200 may be configured to receive audio content over the data network from one or more other playback devices in communication with the playback device 200, network devices within a local area network, or audio content sources over a wide area network such as the Internet. In one example, the audio content and other signals transmitted and received by the playback device 200 may be transmitted in the form of digital packet data containing an Internet Protocol (IP)-based source address and IP-based destination addresses. In such a case, the network interface 214 may be configured to parse the digital packet data such that the data destined for the playback device 200 is properly received and processed by the playback device 200.
As shown, the network interface 214 may include wireless interface(s) 216 and wired interface(s) 218. The wireless interface(s) 216 may provide network interface functions for the playback device 200 to wirelessly communicate with other devices (e.g., other playback device(s), speaker(s), receiver(s), network device(s), control device(s) within a data network the playback device 200 is associated with) in accordance with a communication protocol (e.g., any wireless standard including IEEE 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.15, 4G mobile communication standard, and so on). The wired interface(s) 218 may provide network interface functions for the playback device 200 to communicate over a wired connection with other devices in accordance with a communication protocol (e.g., IEEE 802.3). While the network interface 214 shown in FIG. 2 includes both wireless interface(s) 216 and wired interface(s) 218, the network interface 214 may in some embodiments include only wireless interface(s) or only wired interface(s).
The microphone(s) 220 may be arranged to detect sound in the environment of the playback device 200. For instance, the microphone(s) may be mounted on an exterior wall of a housing of the playback device. The microphone(s) may be any type of microphone now known or later developed such as a condenser microphone, electret condenser microphone, or a dynamic microphone. The microphone(s) may be sensitive to a portion of the frequency range of the speaker(s) 220. One or more of the speaker(s) 220 may operate in reverse as the microphone(s) 220. In some aspects, the playback device 200 might not have microphone(s) 220.
In one example, the playback device 200 and one other playback device may be paired to play two separate audio components of audio content. For instance, playback device 200 may be configured to play a left channel audio component, while the other playback device may be configured to play a right channel audio component, thereby producing or enhancing a stereo effect of the audio content. The paired playback devices (also referred to as “bonded playback devices”) may further play audio content in synchrony with other playback devices.
In another example, the playback device 200 may be sonically consolidated with one or more other playback devices to form a single, consolidated playback device. A consolidated playback device may be configured to process and reproduce sound differently than an unconsolidated playback device or playback devices that are paired, because a consolidated playback device may have additional speaker drivers through which audio content may be rendered. For instance, if the playback device 200 is a playback device designed to render low frequency range audio content (i.e. a subwoofer), the playback device 200 may be consolidated with a playback device designed to render full frequency range audio content. In such a case, the full frequency range playback device, when consolidated with the low frequency playback device 200, may be configured to render only the mid and high frequency components of audio content, while the low frequency range playback device 200 renders the low frequency component of the audio content. The consolidated playback device may further be paired with a single playback device or yet another consolidated playback device.
By way of illustration, SONOS, Inc. presently offers (or has offered) for sale certain playback devices including a “PLAY:1,” “PLAY:3,” “PLAY:5,” “PLAYBAR,” “CONNECT:AMP,” “CONNECT,” and “SUB.” Any other past, present, and/or future playback devices may additionally or alternatively be used to implement the playback devices of example embodiments disclosed herein. Additionally, it is understood that a playback device is not limited to the example illustrated in FIG. 2 or to the SONOS product offerings. For example, a playback device may include a wired or wireless headphone. In another example, a playback device may include or interact with a docking station for personal mobile media playback devices. In yet another example, a playback device may be integral to another device or component such as a television, a lighting fixture, or some other device for indoor or outdoor use.
b. Example Playback Zone Configurations
Referring back to the media playback system 100 of FIG. 1, the environment may have one or more playback zones, each with one or more playback devices. The media playback system 100 may be established with one or more playback zones, after which one or more zones may be added, or removed to arrive at the example configuration shown in FIG. 1. Each zone may be given a name according to a different room or space such as an office, bathroom, master bedroom, bedroom, kitchen, dining room, living room, and/or balcony. In one case, a single playback zone may include multiple rooms or spaces. In another case, a single room or space may include multiple playback zones.
As shown in FIG. 1, the balcony, dining room, kitchen, bathroom, office, and bedroom zones each have one playback device, while the living room and master bedroom zones each have multiple playback devices. In the living room zone, playback devices 104, 106, 108, and 110 may be configured to play audio content in synchrony as individual playback devices, as one or more bonded playback devices, as one or more consolidated playback devices, or any combination thereof. Similarly, in the case of the master bedroom, playback devices 122 and 124 may be configured to play audio content in synchrony as individual playback devices, as a bonded playback device, or as a consolidated playback device.
In one example, one or more playback zones in the environment of FIG. 1 may each be playing different audio content. For instance, the user may be grilling in the balcony zone and listening to hip hop music being played by the playback device 102 while another user may be preparing food in the kitchen zone and listening to classical music being played by the playback device 114. In another example, a playback zone may play the same audio content in synchrony with another playback zone. For instance, the user may be in the office zone where the playback device 118 is playing the same rock music that is being playing by playback device 102 in the balcony zone. In such a case, playback devices 102 and 118 may be playing the rock music in synchrony such that the user may seamlessly (or at least substantially seamlessly) enjoy the audio content that is being played out-loud while moving between different playback zones. Synchronization among playback zones may be achieved in a manner similar to that of synchronization among playback devices, as described in previously referenced U.S. Pat. No. 8,234,395.
As suggested above, the zone configurations of the media playback system 100 may be dynamically modified, and in some embodiments, the media playback system 100 supports numerous configurations. For instance, if a user physically moves one or more playback devices to or from a zone, the media playback system 100 may be reconfigured to accommodate the change(s). For instance, if the user physically moves the playback device 102 from the balcony zone to the office zone, the office zone may now include both the playback device 118 and the playback device 102. The playback device 102 may be paired or grouped with the office zone and/or renamed if so desired via a control device such as the control devices 126 and 128. On the other hand, if the one or more playback devices are moved to a particular area in the home environment that is not already a playback zone, a new playback zone may be created for the particular area.
Further, different playback zones of the media playback system 100 may be dynamically combined into zone groups or split up into individual playback zones. For instance, the dining room zone and the kitchen zone 114 may be combined into a zone group for a dinner party such that playback devices 112 and 114 may render audio content in synchrony. On the other hand, the living room zone may be split into a television zone including playback device 104, and a listening zone including playback devices 106, 108, and 110, if the user wishes to listen to music in the living room space while another user wishes to watch television.
c. Example Control Devices
FIG. 3 shows a functional block diagram of an example control device 300 that may be configured to be one or both of the control devices 126 and 128 of the media playback system 100. As shown, the control device 300 may include a processor 302, memory 304, a network interface 306, a user interface 308, microphone(s) 310, and software components 312. In one example, the control device 300 may be a dedicated controller for the media playback system 100. In another example, the control device 300 may be a network device on which media playback system controller application software may be installed, such as for example, an iPhoneTM, iPadTM or any other smart phone, tablet or network device (e.g., a networked computer such as a PC or MacTM).
The processor 302 may be configured to perform functions relevant to facilitating user access, control, and configuration of the media playback system 100. The memory 304 may be data storage that can be loaded with one or more of the software components executable by the processor 302 to perform those functions. The memory 304 may also be configured to store the media playback system controller application software and other data associated with the media playback system 100 and the user.
In one example, the network interface 306 may be based on an industry standard (e.g., infrared, radio, wired standards including IEEE 802.3, wireless standards including IEEE 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.15, 4G mobile communication standard, and so on). The network interface 306 may provide a means for the control device 300 to communicate with other devices in the media playback system 100. In one example, data and information (e.g., such as a state variable) may be communicated between control device 300 and other devices via the network interface 306. For instance, playback zone and zone group configurations in the media playback system 100 may be received by the control device 300 from a playback device or another network device, or transmitted by the control device 300 to another playback device or network device via the network interface 306. In some cases, the other network device may be another control device.
Playback device control commands such as volume control and audio playback control may also be communicated from the control device 300 to a playback device via the network interface 306. As suggested above, changes to configurations of the media playback system 100 may also be performed by a user using the control device 300. The configuration changes may include adding/removing one or more playback devices to/from a zone, adding/removing one or more zones to/from a zone group, forming a bonded or consolidated player, separating one or more playback devices from a bonded or consolidated player, among others. Accordingly, the control device 300 may sometimes be referred to as a controller, whether the control device 300 is a dedicated controller or a network device on which media playback system controller application software is installed.
Control device 300 may include microphone(s) 310. Microphone(s) 310 may be arranged to detect sound in the environment of the control device 300. Microphone(s) 310 may be any type of microphone now known or later developed such as a condenser microphone, electret condenser microphone, or a dynamic microphone. The microphone(s) may be sensitive to a portion of a frequency range. Two or more microphones 310 may be arranged to capture location information of an audio source (e.g., voice, audible sound) and/or to assist in filtering background noise.
The user interface 308 of the control device 300 may be configured to facilitate user access and control of the media playback system 100, by providing a controller interface such as the controller interface 400 shown in FIG. 4. The controller interface 400 includes a playback control region 410, a playback zone region 420, a playback status region 430, a playback queue region 440, and an audio content sources region 450. The user interface 400 as shown is just one example of a user interface that may be provided on a network device such as the control device 300 of FIG. 3 (and/or the control devices 126 and 128 of FIG. 1) and accessed by users to control a media playback system such as the media playback system 100. Other user interfaces of varying formats, styles, and interactive sequences may alternatively be implemented on one or more network devices to provide comparable control access to a media playback system.
The playback control region 410 may include selectable (e.g., by way of touch or by using a cursor) icons to cause playback devices in a selected playback zone or zone group to play or pause, fast forward, rewind, skip to next, skip to previous, enter/exit shuffle mode, enter/exit repeat mode, enter/exit cross fade mode. The playback control region 410 may also include selectable icons to modify equalization settings, and playback volume, among other possibilities.
The playback zone region 420 may include representations of playback zones within the media playback system 100. In some embodiments, the graphical representations of playback zones may be selectable to bring up additional selectable icons to manage or configure the playback zones in the media playback system, such as a creation of bonded zones, creation of zone groups, separation of zone groups, and renaming of zone groups, among other possibilities.
For example, as shown, a “group” icon may be provided within each of the graphical representations of playback zones. The “group” icon provided within a graphical representation of a particular zone may be selectable to bring up options to select one or more other zones in the media playback system to be grouped with the particular zone. Once grouped, playback devices in the zones that have been grouped with the particular zone will be configured to play audio content in synchrony with the playback device(s) in the particular zone. Analogously, a “group” icon may be provided within a graphical representation of a zone group. In this case, the “group” icon may be selectable to bring up options to deselect one or more zones in the zone group to be removed from the zone group. Other interactions and implementations for grouping and ungrouping zones via a user interface such as the user interface 400 are also possible. The representations of playback zones in the playback zone region 420 may be dynamically updated as playback zone or zone group configurations are modified.
The playback status region 430 may include graphical representations of audio content that is presently being played, previously played, or scheduled to play next in the selected playback zone or zone group. The selected playback zone or zone group may be visually distinguished on the user interface, such as within the playback zone region 420 and/or the playback status region 430. The graphical representations may include track title, artist name, album name, album year, track length, and other relevant information that may be useful for the user to know when controlling the media playback system via the user interface 400.
The playback queue region 440 may include graphical representations of audio content in a playback queue associated with the selected playback zone or zone group. In some embodiments, each playback zone or zone group may be associated with a playback queue containing information corresponding to zero or more audio items for playback by the playback zone or zone group. For instance, each audio item in the playback queue may comprise a uniform resource identifier (URI), a uniform resource locator (URL) or some other identifier that may be used by a playback device in the playback zone or zone group to find and/or retrieve the audio item from a local audio content source or a networked audio content source, possibly for playback by the playback device.
In one example, a playlist may be added to a playback queue, in which case information corresponding to each audio item in the playlist may be added to the playback queue. In another example, audio items in a playback queue may be saved as a playlist. In a further example, a playback queue may be empty, or populated but “not in use” when the playback zone or zone group is playing continuously streaming audio content, such as Internet radio that may continue to play until otherwise stopped, rather than discrete audio items that have playback durations. In an alternative embodiment, a playback queue can include Internet radio and/or other streaming audio content items and be “in use” when the playback zone or zone group is playing those items. Other examples are also possible.
When playback zones or zone groups are “grouped” or “ungrouped,” playback queues associated with the affected playback zones or zone groups may be cleared or re-associated. For example, if a first playback zone including a first playback queue is grouped with a second playback zone including a second playback queue, the established zone group may have an associated playback queue that is initially empty, that contains audio items from the first playback queue (such as if the second playback zone was added to the first playback zone), that contains audio items from the second playback queue (such as if the first playback zone was added to the second playback zone), or a combination of audio items from both the first and second playback queues. Subsequently, if the established zone group is ungrouped, the resulting first playback zone may be re-associated with the previous first playback queue, or be associated with a new playback queue that is empty or contains audio items from the playback queue associated with the established zone group before the established zone group was ungrouped. Similarly, the resulting second playback zone may be re-associated with the previous second playback queue, or be associated with a new playback queue that is empty, or contains audio items from the playback queue associated with the established zone group before the established zone group was ungrouped. Other examples are also possible.
Referring back to the user interface 400 of FIG. 4, the graphical representations of audio content in the playback queue region 440 may include track titles, artist names, track lengths, and other relevant information associated with the audio content in the playback queue. In one example, graphical representations of audio content may be selectable to bring up additional selectable icons to manage and/or manipulate the playback queue and/or audio content represented in the playback queue. For instance, a represented audio content may be removed from the playback queue, moved to a different position within the playback queue, or selected to be played immediately, or after any currently playing audio content, among other possibilities. A playback queue associated with a playback zone or zone group may be stored in a memory on one or more playback devices in the playback zone or zone group, on a playback device that is not in the playback zone or zone group, and/or some other designated device.
The audio content sources region 450 may include graphical representations of selectable audio content sources from which audio content may be retrieved and played by the selected playback zone or zone group. Discussions pertaining to audio content sources may be found in the following section.
d. Example Audio Content Sources
As indicated previously, one or more playback devices in a zone or zone group may be configured to retrieve for playback audio content (e.g. according to a corresponding URI or URL for the audio content) from a variety of available audio content sources. In one example, audio content may be retrieved by a playback device directly from a corresponding audio content source (e.g., a line-in connection). In another example, audio content may be provided to a playback device over a network via one or more other playback devices or network devices.
Example audio content sources may include a memory of one or more playback devices in a media playback system such as the media playback system 100 of FIG. 1, local music libraries on one or more network devices (such as a control device, a network-enabled personal computer, or a networked-attached storage (NAS), for example), streaming audio services providing audio content via the Internet (e.g., the cloud), or audio sources connected to the media playback system via a line-in input connection on a playback device or network devise, among other possibilities.
In some embodiments, audio content sources may be regularly added or removed from a media playback system such as the media playback system 100 of FIG. 1. In one example, an indexing of audio items may be performed whenever one or more audio content sources are added, removed or updated. Indexing of audio items may involve scanning for identifiable audio items in all folders/directory shared over a network accessible by playback devices in the media playback system, and generating or updating an audio content database containing metadata (e.g., title, artist, album, track length, among others) and other associated information, such as a URI or URL for each identifiable audio item found. Other examples for managing and maintaining audio content sources may also be possible.
The above discussions relating to playback devices, controller devices, playback zone configurations, and media content sources provide only some examples of operating environments within which functions and methods described below may be implemented. Other operating environments and configurations of media playback systems, playback devices, and network devices not explicitly described herein may also be applicable and suitable for implementation of the functions and methods.
e. Example Plurality of Networked Devices
FIG. 5 shows an example plurality of devices 500 that may be configured to provide an audio playback experience based on voice control. One having ordinary skill in the art will appreciate that the devices shown in FIG. 5 are for illustrative purposes only, and variations including different and/or additional devices may be possible. As shown, the plurality of devices 500 includes computing devices 504, 506, and 508; network microphone devices (NMDs) 512, 514, and 516; playback devices (PBDs) 532, 534, 536, and 538; and a controller device (CR) 522.
Each of the plurality of devices 500 may be network-capable devices that can establish communication with one or more other devices in the plurality of devices according to one or more network protocols, such as NFC, Bluetooth, Ethernet, and IEEE 802.11, among other examples, over one or more types of networks, such as wide area networks (WAN), local area networks (LAN), and personal area networks (PAN), among other possibilities.
As shown, the computing devices 504, 506, and 508 may be part of a cloud network 502. The cloud network 502 may include additional computing devices. In one example, the computing devices 504, 506, and 508 may be different servers. In another example, two or more of the computing devices 504, 506, and 508 may be modules of a single server. Analogously, each of the computing device 504, 506, and 508 may include one or more modules or servers. For ease of illustration purposes herein, each of the computing devices 504, 506, and 508 may be configured to perform particular functions within the cloud network 502. For instance, computing device 508 may be a source of audio content for a streaming music service.
As shown, the computing device 504 may be configured to interface with NMDs 512, 514, and 516 via communication path 542. NMDs 512, 514, and 516 may be components of one or more “Smart Home” systems. In one case, NMDs 512, 514, and 516 may be physically distributed throughout a household, similar to the distribution of devices shown in FIG. 1. In another case, two or more of the NMDs 512, 514, and 516 may be physically positioned within relative close proximity of one another. Communication path 542 may comprise one or more types of networks, such as a WAN including the Internet, LAN, and/or PAN, among other possibilities.
In one example, one or more of the NMDs 512, 514, and 516 may be devices configured primarily for audio detection. In another example, one or more of the NMDs 512, 514, and 516 may be components of devices having various primary utilities. For instance, as discussed above in connection to FIGS. 2 and 3, one or more of NMDs 512, 514, and 516 may be the microphone(s) 220 of playback device 200 or the microphone(s) 310 of network device 300. Further, in some cases, one or more of NMDs 512, 514, and 516 may be the playback device 200 or network device 300. In an example, one or more of NMDs 512, 514, and/or 516 may include multiple microphones arranged in a microphone array.
As shown, the computing device 506 may be configured to interface with CR 522 and PBDs 532, 534, 536, and 538 via communication path 544. In one example, CR 522 may be a network device such as the network device 200 of FIG. 2. Accordingly, CR 522 may be configured to provide the controller interface 400 of FIG. 4. Similarly, PBDs 532, 534, 536, and 538 may be playback devices such as the playback device 300 of FIG. 3. As such, PBDs 532, 534, 536, and 538 may be physically distributed throughout a household as shown in FIG. 1. For illustration purposes, PBDs 536 and 538 may be part of a bonded zone 530, while PBDs 532 and 534 may be part of their own respective zones. As described above, the PBDs 532, 534, 536, and 538 may be dynamically bonded, grouped, unbonded, and ungrouped. Communication path 544 may comprise one or more types of networks, such as a WAN including the Internet, LAN, and/or PAN, among other possibilities.
In one example, as with NMDs 512, 514, and 516, CR 522 and PBDs 532, 534, 536, and 538 may also be components of one or more “Smart Home” systems. In one case, PBDs 532, 534, 536, and 538 may be distributed throughout the same household as the NMDs 512, 514, and 516. Further, as suggested above, one or more of PBDs 532, 534, 536, and 538 may be one or more of NMDs 512, 514, and 516.
The NMDs 512, 514, and 516 may be part of a local area network, and the communication path 542 may include an access point that links the local area network of the NMDs 512, 514, and 516 to the computing device 504 over a WAN (communication path not shown). Likewise, each of the NMDs 512, 514, and 516 may communicate with each other via such an access point.
Similarly, CR 522 and PBDs 532, 534, 536, and 538 may be part of a local area network and/or a local playback network as discussed in previous sections, and the communication path 544 may include an access point that links the local area network and/or local playback network of CR 522 and PBDs 532, 534, 536, and 538 to the computing device 506 over a WAN. As such, each of the CR 522 and PBDs 532, 534, 536, and 538 may also communicate with each over such an access point.
In one example, communication paths 542 and 544 may comprise the same access point. In an example, each of the NMDs 512, 514, and 516, CR 522, and PBDs 532, 534, 536, and 538 may access the cloud network 502 via the same access point for a household.
As shown in FIG. 5, each of the NMDs 512, 514, and 516, CR 522, and PBDs 532, 534, 536, and 538 may also directly communicate with one or more of the other devices via communication means 546. Communication means 546 as described herein may involve one or more forms of communication between the devices, according to one or more network protocols, over one or more types of networks, and/or may involve communication via one or more other network devices. For instance, communication means 546 may include one or more of for example, BluetoothTM (IEEE 802.15), NFC, Wireless direct, and/or Proprietary wireless, among other possibilities.
In one example, CR 522 may communicate with NMD 512 over BluetoothTM, and communicate with PBD 534 over another local area network. In another example, NMD 514 may communicate with CR 522 over another local area network, and communicate with PBD 536 over Bluetooth. In a further example, each of the PBDs 532, 534, 536, and 538 may communicate with each other according to a spanning tree protocol over a local playback network, while each communicating with CR 522 over a local area network, different from the local playback network. Other examples are also possible.
In some cases, communication means between the NMDs 512, 514, and 516, CR 522, and PBDs 532, 534, 536, and 538 may change depending on types of communication between the devices, network conditions, and/or latency demands. For instance, communication means 546 may be used when NMD 516 is first introduced to the household with the PBDs 532, 534, 536, and 538. In one case, the NMD 516 may transmit identification information corresponding to the NMD 516 to PBD 538 via NFC, and PBD 538 may in response, transmit local area network information to NMD 516 via NFC (or some other form of communication). However, once NMD 516 has been configured within the household, communication means between NMD 516 and PBD 538 may change. For instance, NMD 516 may subsequently communicate with PBD 538 via communication path 542, the cloud network 502, and communication path 544. In another example, the NMDs and PBDs may never communicate via local communications means 546. In a further example, the NMDs and PBDs may communicate primarily via local communications means 546. Other examples are also possible.
In an illustrative example, NMDs 512, 514, and 516 may be configured to receive voice inputs to control PBDs 532, 534, 536, and 538. The available control commands may include any media playback system controls previously discussed, such as playback volume control, playback transport controls, music source selection, and grouping, among other possibilities. In one instance, NMD 512 may receive a voice input to control one or more of the PBDs 532, 534, 536, and 538. In response to receiving the voice input, NMD 512 may transmit via communication path 542, the voice input to computing device 504 for processing. In one example, the computing device 504 may convert the voice input to an equivalent text command, and parse the text command to identify a command. Computing device 504 may then subsequently transmit the text command to the computing device 506. In another example, the computing device 504 may convert the voice input to an equivalent text command, and then subsequently transmit the text command to the computing device 506. The computing device 506 may then parse the text command to identify one or more playback commands.
For instance, if the text command is “Play ‘Track 1’ by ‘Artist 1’ from ‘Streaming Service 1’ in ‘Zone 1’,” The computing device 506 may identify (i) a URL for “Track 1” by “Artist 1” available from “Streaming Service 1,” and (ii) at least one playback device in “Zone 1.” In this example, the URL for “Track 1” by “Artist 1” from “Streaming Service 1” may be a URL pointing to computing device 508, and “Zone 1” may be the bonded zone 530. As such, upon identifying the URL and one or both of PBDs 536 and 538, the computing device 506 may transmit via communication path 544 to one or both of PBDs 536 and 538, the identified URL for playback. One or both of PBDs 536 and 538 may responsively retrieve audio content from the computing device 508 according to the received URL, and begin playing “Track 1” by “Artist 1” from “Streaming Service 1.”
One having ordinary skill in the art will appreciate that the above is just one illustrative example, and that other implementations are also possible. In one case, operations performed by one or more of the plurality of devices 500, as described above, may be performed by one or more other devices in the plurality of device 500. For instance, the conversion from voice input to the text command may be alternatively, partially, or wholly performed by another device or devices, such as NMD 512, computing device 506, PBD 536, and/or PBD 538. Analogously, the identification of the URL may be alternatively, partially, or wholly performed by another device or devices, such as NMD 512, computing device 504, PBD 536, and/or PBD 538.
f. Example Network Microphone Device
FIG. 6 shows a function block diagram of an example network microphone device 600 that may be configured to be one or more of NMDs 512, 514, and 516 of FIG. 5. As shown, the network microphone device 600 includes a processor 602, memory 604, a microphone array 606, a network interface 608, a user interface 610, software components 612, and speaker(s) 614. One having ordinary skill in the art will appreciate that other network microphone device configurations and arrangements are also possible. For instance, network microphone devices may alternatively exclude the speaker(s) 614 or have a single microphone instead of microphone array 606.
The processor 602 may include one or more processors and/or controllers, which may take the form of a general or special-purpose processor or controller. For instance, the processing unit 602 may include microprocessors, microcontrollers, application-specific integrated circuits, digital signal processors, and the like. The memory 604 may be data storage that can be loaded with one or more of the software components executable by the processor 602 to perform those functions. Accordingly, memory 604 may comprise one or more non-transitory computer-readable storage mediums, examples of which may include volatile storage mediums such as random access memory, registers, cache, etc. and non-volatile storage mediums such as read-only memory, a hard-disk drive, a solid-state drive, flash memory, and/or an optical-storage device, among other possibilities.
The microphone array 606 may be a plurality of microphones arranged to detect sound in the environment of the network microphone device 600. Microphone array 606 may include any type of microphone now known or later developed such as a condenser microphone, electret condenser microphone, or a dynamic microphone, among other possibilities. In one example, the microphone array may be arranged to detect audio from one or more directions relative to the network microphone device. The microphone array 606 may be sensitive to a portion of a frequency range. In one example, a first subset of the microphone array 606 may be sensitive to a first frequency range, while a second subset of the microphone array may be sensitive to a second frequency range. The microphone array 606 may further be arranged to capture location information of an audio source (e.g., voice, audible sound) and/or to assist in filtering background noise. Notably, in some embodiments the microphone array may consist of only a single microphone, rather than a plurality of microphones.
The network interface 608 may be configured to facilitate wireless and/or wired communication between various network devices, such as, in reference to FIG. 5, CR 522, PBDs 532-538, computing device 504-508 in cloud network 502, and other network microphone devices, among other possibilities. As such, network interface 608 may take any suitable form for carrying out these functions, examples of which may include an Ethernet interface, a serial bus interface (e.g., FireWire, USB 2.0, etc.), a chipset and antenna adapted to facilitate wireless communication, and/or any other interface that provides for wired and/or wireless communication. In one example, the network interface 608 may be based on an industry standard (e.g., infrared, radio, wired standards including IEEE 802.3, wireless standards including IEEE 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.15, 4G mobile communication standard, and so on).
The user interface 610 of the network microphone device 600 may be configured to facilitate user interactions with the network microphone device. In one example, the user interface 608 may include one or more of physical buttons, graphical interfaces provided on touch sensitive screen(s) and/or surface(s), among other possibilities, for a user to directly provide input to the network microphone device 600. The user interface 610 may further include one or more of lights and the speaker(s) 614 to provide visual and/or audio feedback to a user. In one example, the network microphone device 600 may further be configured to playback audio content via the speaker(s) 614.
III. Example Systems
In many situations, the network microphone device may be placed in proximity to a playback device. For instance, the playback device may be placed in the same room as a network microphone device.
Embodiments described herein involve providing to a network microphone device acoustics of an environment in which the network microphone device operates. The environment may be a room of a home, such as a bedroom or living room. The acoustics of the environment may define how sound travels in the room. The acoustics of the environment may be used by the network microphone device in order to interpret voice input spoken to the network microphone device.
The acoustics are typically defined by surfaces in the environment. For example, hard surfaces in a room may reflect sound. On the other hand, soft surfaces may absorb sound. The presence and arrangement of these different types of surfaces in the environment will affect the acoustics of the room and the ability of the network microphone device to interpret the voice input.
The network microphone device may need to accurately recover voice input spoken in view of these acoustics. Additionally, in some instance, audio content may be simultaneously played back by the playback device at the same time that the network microphone device receives a voice input. The knowledge of the acoustics of the environment and/or content playback may be used by the network microphone device to interpret the voice input.
FIG. 7-11 present embodiments that can be implemented within the disclosed operating environment. Methods and the other process disclosed herein may include one or more operations, functions, or actions. Although the blocks are illustrated in sequential order, these blocks may also be performed in parallel, and/or in a different order than those described herein. Also, the various blocks may be combined into fewer blocks, divided into additional blocks, and/or removed based upon the desired implementation.
In addition, for the methods and other processes and methods disclosed herein, the flowchart shows functionality and operation of one possible implementation of present embodiments. In this regard, each block may represent a module, a segment, or a portion of program code, which includes one or more instructions executable by a processor for implementing specific logical functions or steps in the process. The program code may be stored on any type of computer readable medium, for example, such as a storage device including a disk or hard drive. The computer readable medium may include non-transitory computer readable medium, for example, such as computer-readable media that stores data for short periods of time like register memory, processor cache and Random Access Memory (RAM). The computer readable medium may also include non-transitory media, such as secondary or persistent long term storage, like read only memory (ROM), optical or magnetic disks, compact-disc read only memory (CD-ROM), for example. The computer readable media may also be any other volatile or non-volatile storage systems. The computer readable medium may be considered a computer readable storage medium, for example, or a tangible storage device. In addition, each block in the figures may represent circuitry that is wired to perform the specific logical functions in the process.
FIG. 7 is flow chart of functions that may be performed to improve interpretation of voice input received by the network microphone device. In some examples, one or more of these functions described may be performed by a playback device. In other example, computing device such as 504-508 may also perform one or more of these functions in conjunction with the playback device or instead of the playback device. The computing device may be associated with a playback device and perform processing associated with the playback device.
At 702, acoustics of an environment may be obtained. The acoustics may be associated with an environment in which in a playback device is operating. The acoustics may have been determined in a variety of ways. For example, a playback system may have already determined the acoustics of the environment through some calibration phase. A playback device of a media playback system may have a microphone and speaker. The speaker may output one or more tones and one or more speakers may receive the tone using a respective microphone. The tone may be one or more frequencies of audio. Each of the playback devices may output tones. Based on the tones received by the plurality of playback devices, the acoustics of the environment can be determined. In another example, another network device (such as a control device, first playback device, or even the network microphone device itself) may include a microphone that receives test tones output by the speaker of a second playback device. The other network device may analyze the received test tones to determine the acoustics of the environment, rather than or in addition to a playback device. Other arrangements are also possible.
The acoustics may be defined by a spectral response, spatial response, and a temporal response of the tones. The spectral response may be an analysis of sound energy received at a microphone. The spatial response may be an analysis of a direction of the sound energy received at the microphone. The temporal response may be an analysis of reverberations of sound energy received at the microphone. The playback system may analyze these responses and perhaps also accounting for the direction from where the tones are received to determine the acoustics of the environment. An indication of this acoustic characteristic may be stored on a playback device and/or one or more of the computing devices 504-508.
In another example, the acoustics may be predefined based on known characteristics of the environment such as size of the room, height of the ceiling of a room, and furniture in the room. A database maintained by one or more of the computing device 504-508 may store acoustics for rooms with different types of characteristics. The acoustics stored on the computing device may have been determined based on a previous analysis of the room with the particular characteristics. A user may input the characteristics of the room on the controller device of the media playback system and the controller device may access this database to determine the acoustics of the room. These acoustics may be then provided to the playback device located in the environment or stored on the computing device.
As an example, the acoustics may indicate that a room has a hard surface on a left side, a soft surface on the right side and be a rectangular shape. In essence, the acoustics may characterize the room from an acoustical perspective.
The media playback system may include a plurality of playback devices. Each of the playback devices may have acoustics of the environment in which the playback device operates. At 704, one or more network microphone devices may be identified. The one or more network microphones device may be in a same environment. In some examples, the playback device which sends the acoustics to the network microphone device may be the playback device that is closest to the network microphone device. In other examples, the playback device which sends the acoustics to the network microphone device may be the playback device that is in a same zone as the network microphone device. The proximity may be indicated during some calibration process during setup of the playback device and/or network microphone device. For example, the network microphone device may send an indication of its presence to the playback device. This presence may be indicated by a state variable in the playback device. The playback device may access this state variable to identify the network microphone device. Similarly, the network microphone device may have a similar state variable that identifies presence of the playback device.
In other examples, a playback device of the media playback system may be bonded (paired or grouped) with the network microphone device. The bond may also indicate that the playback device and the network microphone device are in close proximity to each other, such as in a same room or zone, or playing audio content in synchrony. The bonding between a playback device and network microphone device may be similar in some respects to how playback devices may be bonded. This bonding may be reflected in the state variable stored by the playback device. When the network microphone device is bonded with a playback device, the playback device may be arranged to identify network microphone device. Moreover, if the network microphone device is moved and bonded to another playback device, the state variable in the other playback device may be updated to reflect the bonding with the network microphone device. Similarly, the network microphone device may update its state variable to reflect presence of the new playback device.
In some examples, the bonded playback device and network microphone device may use various networking techniques to reduce the latency between themselves. For example, a local rather than WAN network connection (LAN or Bluetooth) may be used for communication. As another example, communications might revert to a different frequency range in the local network, e.g., switch from a “typical” 2.4 Ghz communication to a 5 Ghz communication while the playback device is bonded to the network microphone device. As yet another example, communications might switch to a reserved channel on either the 2.4 or 5 Ghz spectrum or other network traffic may be reduced when the playback device and network microphone device is bonded, e.g., the playback device might stop serving as a relay node for other network traffic. Other arrangements are also possible.
At 706, the acoustics may be provided to cause the acoustics to be applied to voice input. In one embodiment, the acoustics may be sent as a message from the playback device over one or more of the communication network 546 to the network microphone device. In other embodiments, the playback device may cause the acoustics on a computing device to be sent to the network microphone device via communication link 542. In still other embodiments the acoustics may be on a computing device associated with the playback device and the playback device may cause the computing device associated with the network microphone device to have access to the acoustics. Other arrangements are also possible.
In some embodiments, the playback device might not need to provide the acoustics to the network microphone device. Instead, the network microphone device may be able to retrieve the acoustics from the computing device, itself. The network microphone device may provide an indication of the playback device in proximity to it (bonded, paired, or otherwise) and the computing device may provide the acoustics for the environment. Other arrangements are also possible.
The network microphone device may typically process voice input via a microphone response. The microphone response is an indication of sensitivity of the microphone with respect to frequency.
In embodiments, the network microphone device may apply acoustics to the voice input that it receives to correct for distortions in the voice input. This way the network microphone device may be able to better interpret the voice input. The network microphone device may apply this acoustics itself and/or offload processing to the computing device in which case the processing on the network microphone device may be cloud-based.
The network microphone device may define a filter based on the acoustics in applying the acoustics to the voice input. The filter may include the spectral, spatial, and temporal responses of the environment. The network microphone device may apply the filter to the voice input received by the network microphone device to correct for distortion prior to interpreting the voice input. The filter may be determined based on the following derivation:

Xa(w)×P(w)×h(w)×m(w)=Ya(w)

Where Xa is a calibration tone, P is a speaker response of the playback device, h is a room response (e.g., acoustics of the room), m is a microphone response, and Ya is a processed response which may be the received tone corresponding to the tone sent during a calibration process. The symbol × represents a convolution function in a frequency domain. As Xa, P, m, and Ya are known, the room response (e.g., filter) may be calculated as:

h−1(w):Xa(w)×P(w)×m(w)=Ya(w)×h−1(w)

Then, if a voice input Yb is received, the room response h (e.g., filter) may be applied to determine the voice input Xb as:

Xb(w)=Yb(w)×h−1(w)×P−1(w)×m−1(w)

In some embodiments, the playback system may determine the acoustics of the environment periodically to account for changes in the environment. In this case, one or more playback devices may perform the operations 702-706 periodically such that the network microphone device may apply current acoustics to the received voice input to properly interpret it.
FIG. 8 is another flow chart of functions that may be performed improve recovery of voice input by the network microphone device. In some examples, one or more of these functions described may be performed by a playback device. In other example, computing device such as 504-508 may also perform one or more of these functions in conjunction with the playback device or instead of the playback device. The computing device may be associated with a playback device and perform processing associated with the playback device.
At 802, acoustics of the environment may be obtained, at 804, a network microphone device may be identified, and at 806, acoustics may be provided. The acoustics may be provided to a network microphone device and/or computing device associated with the network microphone device.
In some situations, the network microphone device may be operating in an environment where the media playback system is also playing back audio content. The network microphone device may receive voice input while the audio content is also being played.
At 808, audio content may be provided. The audio content may be provided to the network microphone device and/or computing device associated with the network microphone device. The content may be, for instance, a stream of the music being played by the playback device. A playback device may provide the audio content to the network microphone device which is proximate to the network microphone device, in a same zone as the network microphone device, or that which may be bonded (or grouped) to the network microphone device. In some embodiments, the content may be provided to the network microphone device by way of the computing device, for instance, when processing by the network microphone device is cloud-based. In yet other embodiments, the content may be provided to the computing device associated with the network microphone device by way of the computing device associated with the playback device, for instance, when processing by the network microphone device and/or playback device is cloud-based.
At 808, the acoustics (and optionally audio content) may be applied to the voice input. For example, the network microphone device (or computing device associated with the network microphone device) may apply a filter to voice input received by the network microphone device to interpret the voice input. For example, the network microphone device (or computing device associated with the network microphone device may use the audio content being played back along with the voice input to as to better isolate the voice input. For purposes of interpreting the voice input, the audio content being played by the playback device may be effectively noise. In this regard, the audio content may be subtracted out from the received voice input so as to better isolate the received voice input.
FIG. 9 is a flow chart of functions performed by the network microphone device and/or associated computing device in interpreting voice input. At 902, an indication of the acoustics of the environment may be obtained. At 904, the audio content being played by a playback device may also be optionally received. The playback device may be in a same zone, in the presence of the network microphone device, or bonded to the network microphone device. At 906, voice input may be received, e.g., by the network microphone device. The voice input may be a voice command. The network microphone device might know it has received voice input through some button press on the network microphone device or command word in the voice input indicative of it being a voice input. At 908, one or more of a filters and/or the audio content being played by the playback device may be applied/used to interpret the received voice input.
FIG. 10 is a flow chart of functions to enable the network microphone device to determine the acoustics of an environment rather than this being provided by the playback device, for instance. The functions may be performed by the playback device and/or computing devices associated with the playback device.
The network microphone device may send an indication for one or more playback devices to play a tone. The playback devices that the network microphone device sends the indication to may include those playback devices in proximity to the network microphone device and/or those playback devices that are bonded (or grouped) to the network microphone device or in the same zone.
At 1002, an indication may be received to play an audio tone. The indication may be received from the network microphone device or computing device associated with the network microphone device. In response, at 1004, an audio tone may be output by the playback device. The network microphone device may receive the tone using the microphone array 606. The microphone array 606 may provide an indication of a magnitude of the tone. Additionally, the microphone array 606 may provide an indication of a direction of the tone. The direction may be determined based on receiving tones from a plurality of playback devices. Based on receiving tones from a plurality of playback devices, the network microphone device and/or associated computing device may then determine the acoustics of the environment. This way the network microphone device may not need to obtain this acoustics from a playback device.
The microphone array 606 may enable the network microphone device to determine a direction from where voice input is coming from. This direction could be used by a playback device to improve playback of audio content. For example, the media playback system may direct the audio sound produced from one or more playback devices in the same direction from where voice input comes from. This may be where a listener is located. Other arrangements are also possible.
FIG. 11 is a flow chart of functions performed by the playback device and/or associated computing device associated with using directionality determined via the network microphone device.
At 1102, an indication of a direction may be received. This may be received from the network microphone device and/or associated computing device. The direction may indicate where the network microphone device received voice input and therefore where a user may be located in the environment. The playback device may have a plurality of speakers whose output may be controlled to affect directionality of audio content played back by the playback device. At 1104, the playback device may use this directionality to adjust audio output of the plurality of speakers. The audio output may be playback of music content. The playback device may adjust phase of the audio signals output by the speakers to produce directionality in the audio output in accordance with the directionality indicated by the network microphone device. In this regard, the audio content might be directed to the user and therefore improve the listening audio experience. Additionally, or alternatively, the playback device might also adjust a magnitude of the audio output (e.g., volume). The network microphone device in some instances might also produce audio output. The audio output may be a voice response to the voice input or some type of other sound such as a beep or tone. Still additionally, or alternatively, the directionality may be used by the playback system to identify a playback device that might be suited for outputting this audio output instead of or in addition to the network microphone device. For example, the identified playback device might be directly in front of a listener, making it easier for the listener to hear the audio output. Other arrangements are also possible.
Methods and the other process disclosed herein may include one or more operations, functions, or actions. Although the blocks are illustrated in sequential order, these blocks may also be performed in parallel, and/or in a different order than those described herein. Also, the various blocks may be combined into fewer blocks, divided into additional blocks, and/or removed based upon the desired implementation.
In addition, for the methods and other processes and methods disclosed herein, the flowchart shows functionality and operation of one possible implementation of present embodiments. In this regard, each block may represent a module, a segment, or a portion of program code, which includes one or more instructions executable by a processor for implementing specific logical functions or steps in the process. The program code may be stored on any type of computer readable medium, for example, such as a storage device including a disk or hard drive. The computer readable medium may include non-transitory computer readable medium, for example, such as computer-readable media that stores data for short periods of time like register memory, processor cache and Random Access Memory (RAM). The computer readable medium may also include non-transitory media, such as secondary or persistent long term storage, like read only memory (ROM), optical or magnetic disks, compact-disc read only memory (CD-ROM), for example. The computer readable media may also be any other volatile or non-volatile storage systems. The computer readable medium may be considered a computer readable storage medium, for example, or a tangible storage device. In addition, each block in the figures may represent circuitry that is wired to perform the specific logical functions in the process.
IV. Conclusion
The description above discloses, among other things, various example systems, methods, apparatus, and articles of manufacture including, among other components, firmware and/or software executed on hardware. It is understood that such examples are merely illustrative and should not be considered as limiting. For example, it is contemplated that any or all of the firmware, hardware, and/or software aspects or components can be embodied exclusively in hardware, exclusively in software, exclusively in firmware, or in any combination of hardware, software, and/or firmware. Accordingly, the examples provided are not the only way(s) to implement such systems, methods, apparatus, and/or articles of manufacture.
Additionally, references herein to “embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one example embodiment of an invention. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. As such, the embodiments described herein, explicitly and implicitly understood by one skilled in the art, can be combined with other embodiments.
The specification is presented largely in terms of illustrative environments, systems, procedures, steps, logic blocks, processing, and other symbolic representations that directly or indirectly resemble the operations of data processing devices coupled to networks. These process descriptions and representations are typically used by those skilled in the art to most effectively convey the substance of their work to others skilled in the art. Numerous specific details are set forth to provide a thorough understanding of the present disclosure. However, it is understood to those skilled in the art that certain embodiments of the present disclosure can be practiced without certain, specific details. In other instances, well known methods, procedures, components, and circuitry have not been described in detail to avoid unnecessarily obscuring aspects of the embodiments. Accordingly, the scope of the present disclosure is defined by the appended claims rather than the forgoing description of embodiments.
When any of the appended claims are read to cover a purely software and/or firmware implementation, at least one of the elements in at least one example is hereby expressly defined to include a tangible, non-transitory medium such as a memory, DVD, CD, Blu-ray, and so on, storing the software and/or firmware.

## Claims

1. A playback device comprising:
a network interface;
a processor; and
tangible, non-transitory computer-readable media having stored thereon instructions, which when executed by the processor, cause the playback device to perform functions comprising:
obtaining acoustics of an environment in which the playback device is located, wherein obtaining the acoustics of the environment comprises emitting a calibration tone;
receiving via the network interface, data indicating a network microphone device to be bonded with the playback device; and
based on receiving the data indicating the network microphone device, sending via the network interface, the acoustics to the network microphone device to cause the network microphone device to apply the acoustics to audio data detected by the network microphone device, while the network microphone is bonded with the playback device.

2. The playback device of claim 1, wherein the functions further comprise:
sending audio content to the network microphone device to cause the network microphone device to apply the audio content to the detected audio data.

3. The playback device of claim 1, wherein the data indicating the network microphone device indicates that the network microphone device is a network microphone that is closest to the playback device.

4. The playback device of claim 1, wherein the data indicating the network microphone device indicates that the network microphone is in a same zone as the playback device.

5. The playback device of claim 1, wherein the functions further comprise:
receiving an indication of direction of the detected audio data from the network microphone device; and
adjusting directionality of audio content played by the playback device based on the direction.

6. The playback device of claim 1, wherein sending via the network interface, the acoustics to the network microphone device to cause the network microphone device to apply the acoustics to audio data detected by the network microphone device comprises causing the network microphone device to apply a filter to the audio data detected by the network microphone device, wherein the filter is based on the acoustics of the environment.

7. The playback device of claim 1, wherein obtaining the acoustics of the environment further comprises:
receiving from a network computing device, data indicating the acoustics of the environment, wherein the network computing device is different than the network microphone device to be bonded with the playback device.

8. A method comprising:
obtaining, by a playback device, acoustics of an environment in which the playback device is located, wherein obtaining the acoustics of the environment comprises emitting, by the playback device, a calibration tone;
receiving, by the playback device, data indicating a network microphone device to be bonded with the playback device; and
based on receiving the data indicating the network microphone device, sending, by the playback device, the acoustics to the network microphone device to cause the network microphone device to apply the acoustics to audio data detected by the network microphone device, while the network microphone is bonded with the playback device.

9. The method of claim 8, further comprising:
sending audio content to the network microphone device to cause the network microphone device to apply the audio content to the detected audio data.

10. The method of claim 8, wherein the data indicating the network microphone device indicates that the network microphone device is a network microphone that is closest to the playback device.

11. The method of claim 8, wherein the data indicating the network microphone device indicates that the network microphone is in a same zone as the playback device.

12. The method of claim 8, further comprising:
receiving an indication of direction of the detected audio data from the network microphone device; and
adjusting directionality of audio content played by the playback device based on the direction.

13. The method of claim 8, wherein sending via the network interface, the acoustics to the network microphone device to cause the network microphone device to apply the acoustics to audio data detected by the network microphone device comprises causing the network microphone device to apply a filter to the audio data detected by the network microphone device, wherein the filter is based on the acoustics of the environment.

14. The method of claim 8, wherein obtaining, by the playback device, the acoustics of the environment further comprises:
receiving by the playback device from a network computing device, data indicating the acoustics of the environment, wherein the network computing device is different than the network microphone device to be bonded with the playback device.

15. A tangible non-transitory computer readable storage medium having stored thereon instructions, that when executed by a processor of a playback device, cause the playback device to perform functions comprising:
obtaining acoustics of an environment in which the playback device is located, wherein obtaining the acoustics of the environment comprises emitting a calibration tone;
receiving data indicating a network microphone device to be bonded with the playback device; and
based on receiving the data indicating the network microphone device, sending the acoustics to the network microphone device to cause the network microphone device to apply the acoustics to audio data detected by the network microphone device, while the network microphone is bonded with the playback device.

16. The tangible non-transitory computer readable storage medium of claim 15, further comprising:
sending audio content to the network microphone device to cause the network microphone device to apply the audio content to the detected audio data.

17. The tangible non-transitory computer readable storage medium of claim 15, wherein the data indicating the network microphone device indicates that the network microphone device is a network microphone that is closest to the playback device.

18. The tangible non-transitory computer readable storage medium of claim 15, wherein the data indicating the network microphone device indicates that the network microphone is in a same zone as the playback device.

19. The tangible non-transitory computer readable storage medium of claim 15, wherein sending via the network interface, the acoustics to the network microphone device to cause the network microphone device to apply the acoustics to audio data detected by the network microphone device comprises causing the network microphone device to apply a filter to the audio data detected by the network microphone device, wherein the filter is based on the acoustics of the environment.

20. The tangible non-transitory computer readable storage medium of claim 15, wherein obtaining the acoustics of the environment further comprises:
receiving from a network computing device, data indicating the acoustics of the environment, wherein the network computing device is different than the network microphone device to be bonded with the playback device.