Patent Publication Number: US-11393472-B2

Title: Method and apparatus for executing voice command in electronic device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application is a Continuation of U.S. patent application Ser. No. 16/149,304 filed on Oct. 2, 2018, which is a Continuation of the earlier U.S. patent application Ser. No. 15/433,196 filed on Feb. 15, 2017 which claims the benefit of the earlier U.S. patent application Ser. No. 13/903,345 filed on May 28, 2013 and assigned U.S. Pat. No. 9,619,200 issued on Apr. 11, 2017 which claims the benefit under 35 U.S.C. § 119(a) to a Korean patent application filed in the Korean Intellectual Property Office on May 29, 2012, and assigned Serial No. 10-2012-0057044, the entire disclosure of which is hereby incorporated by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates generally to an electronic device. More particularly, the present disclosure relates to an apparatus and a method for executing a voice command in an electronic device. 
     BACKGROUND 
     In recent times, as multimedia technologies have grown, electronic devices having multiple functions have proliferated. Examples of such multi-function devices include portable terminals such as smart phones, tablet PCs, smart cameras, as well as fixed home-based devices such as electronic devices integrated with home kitchen appliances. The electronic devices mostly include a convergence function which combines a number of functions. 
     Portable terminal designers strive to achieve advanced performance as well as the convergence function, as well as slim and aesthetic designs of the device as a whole. Terminal manufacturers compete to present substantially the same or advanced performance and to engineer new models that are smaller and slimmer than prior designs. 
     Among the various functions available, a recently commercialized device provides a voice recognition function of relatively high accuracy. Such a voice recognition function accurately recognizes a user&#39;s voice to easily execute a corresponding function of the device without having to press a separate button or touch a key or touchscreen. 
     For example, the voice recognition function allows the user to make a call or write a text message without separate manipulation in a portable terminal such as a smart phone, to send the generated message, and to easily set various functions such as a route planner, Internet search, and alarm. 
     To execute the voice recognition function, the related art drives a corresponding voice recognition application, activates the voice recognition function, and then performs the corresponding function. 
     However, to perform the voice recognition, the voice recognition application is initially started in response to a touch input command on a separate key or the touchscreen. This operation goes against the unique function of the voice recognition for facilitating data input without touch. Further, launching the voice recognition application requires finding it in a display screen including various application objects, which may be difficult and time consuming in some circumstances. 
     SUMMARY 
     Embodiments of apparatus and methods for executing a voice command in an electronic device are disclosed. In an exemplary embodiment, a voice signal is detected and speech thereof is recognized. When the recognized speech contains a wakeup command, a voice command mode is activated, and a signal containing at least a portion of the detected voice signal is transmitted to a server. The server generates a control signal or a result signal corresponding to the voice command, and transmits the same back to the electronic device. The device receives and processes the control or result signal, and awakens. Thereby, voice commands are executed without the need for the user to physically touch the electronic device. 
     In various embodiments: 
     The voice signal may comprise the wakeup command followed by the voice command. 
     The wakeup command may also comprise the voice command. 
     A silence duration may be determined between the wakeup command and the voice command. 
     Processing the control signal or the result signal may comprise executing a particular application of the electronic device. 
     Processing of the control signal or the result signal may comprise displaying data corresponding to the result signal. 
     Once the voice command mode is activated, an object may be activated on a display indicative of the voice command mode being activated. 
     When a screen is locked prior to recognizing the wakeup command in the speech, the screen may be unlocked responsive to the recognized wakeup command. 
     The speech may be recognized to contain a predetermined wakeup command only if a predetermined speaker of the voice signal is recognized. The wakeup command may be detected automatically when the voice of the predetermined speaker is recognized. 
     Alternatively, the wakeup command may be detected when the voice of the predetermined speaker is recognized and a predetermined wakeup command is recognized within the speech of the predetermined speaker. In another embodiment, a method for executing a voice command in an electronic device, comprises: detecting a voice signal which contains at least one of a wakeup command and a voice command; transmitting the voice signal to a server; awakening the electronic device upon receiving a result signal indicative of the server detecting the wakeup command in the voice signal; receiving a control signal or a result signal corresponding to the voice command from the server; and processing the control signal or the result signal corresponding to the voice command. 
     In an embodiment, a method operable in a server, for supporting a voice command of an electronic device, comprises: receiving a transmitted voice signal which contains at least a voice command, from the electronic device; generating a control signal or a result signal corresponding to the voice command by recognizing and analyzing the voice command; and sending the control signal or the result signal corresponding to the first voice command, to the electronic device. 
     In an embodiment, an electronic device comprises: one or more processors; a memory; and one or more programs stored in the memory and configured for execution by the one or more processors, wherein the program comprises instructions for detecting a voice signal and recognizing speech thereof; when the speech is recognized to contain a wakeup command, activating a voice command mode and transmitting a transmit signal containing at least a portion of the detected voice signal to a server; and receiving and processing a control signal or a result signal generated and transmitted by the server in response to a voice command within the transmit signal recognized by the server. 
     Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of certain exemplary embodiments of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1A  is a block diagram of an electronic device for executing a voice command according to an exemplary embodiment of the present invention; 
         FIG. 1B  is a diagram of a system for executing voice commands according to an embodiment; 
         FIG. 2  is a flowchart of a method for executing wakeup and voice commands in an electronic device according to one exemplary embodiment of the present invention; 
         FIG. 3  is a flowchart of a method operable in a server according to one exemplary embodiment of the present invention; 
         FIG. 4  is a flowchart of method for executing a voice command in an electronic device according to another exemplary embodiment of the present invention; 
         FIG. 5  is a flowchart of another method operable in a server according to another exemplary embodiment of the present invention; 
         FIG. 6  is a flowchart of a method for executing a voice command in an electronic device according to yet another exemplary embodiment of the present invention; 
         FIG. 7  illustrates a voice signal including a wakeup command and the voice command that may be detected and recognized according to embodiments of the present invention; 
         FIG. 8A ,  FIG. 8B  and  FIG. 8C  illustrate a dialing based on the voice signal including the wakeup command and the voice command according to an exemplary embodiment of the present invention; and 
         FIG. 9A  and  FIG. 9B  depict screenshots for illustrating a screen unlocked through wakeup command detection according to an exemplary embodiment of the present invention. 
     
    
    
     Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures. 
     DETAILED DESCRIPTION 
     The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
     The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention is provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. 
     It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
     By the term “substantially” it is meant that the recited characteristic, parameter, or value need not be achieved exactly, but that deviations or variations, including for example, tolerances, measurement error, measurement accuracy limitations and other factors known to those of skill in the art, may occur in amounts that do not preclude the effect the characteristic was intended to provide. 
     Exemplary embodiments of the present invention provide an apparatus and a method for executing a voice command in an electronic device and a server. 
       FIG. 1A  depicts an electronic device  100  for executing a voice command according to an exemplary embodiment of the present invention. Electronic device  100  can be any one of a variety of fixed or portable devices. A portable device can be a portable terminal, mobile terminal, mobile pad, media player, tablet computer, smart phone, a notebook/desktop computer, a Personal Digital Assistant (PDA), a smart camera, and so forth. The electronic device may be a portable electronic device combining two or more functions of those devices. An example of a fixed electronic device is an electronic display device attached to a home appliance such as a kitchen appliance. 
     Electronic device  100  can include a controller  110 , a speaker/microphone  112 , a camera  120 , a Global Positioning System (GPS) receiver  130 , a Radio Frequency (RF) unit  140 , a sensor module  150 , a touch screen  160 , a touch screen controller  165 , and an external memory  170 . 
     Briefly, according to embodiments of the invention, device  100  detects a voice signal and recognizes speech in the detected signal. When the speech is recognized to contain a wakeup command, device  100  activates a voice command mode. In the voice command mode, device  100  is able to respond to subsequent voice commands. Thus, if the device is in a locked screen state or an idle state (or in both of these states if conditions allow), the device can be awakened through the wakeup command recognition without the need for the user to physically touch a key or touchscreen on the device  100 . Once the wakeup command is detected, a speech recognition process is performed to discern if a voice command has been uttered. If a voice command is recognized, the device  100  can then perform an operation associated with that command. 
     In one embodiment, both the wakeup command detection and the voice command recognition are performed in the device  100 . In another embodiment, the wakeup command detection is performed at device  100  and the voice command recognition is performed at a server, following a transmission of a portion of the voice signal from the device  100  to the server. In still another embodiment, both the wakeup command detection and the voice command detection are performed at the server. 
     The controller  100  can include an interface  101 , one or more processors  102  and  103 , and an internal memory  104 . In some cases, the whole controller  110  may be referred to as the processor. The interface  101 , the application processor  102 , the communication processor  103 , and the internal memory  104  can be separate components or integrated onto one or more integrated circuits. 
     The application processor  102  performs various functions for the electronic device by running various software programs and the communication processor  103  processes and controls voice communication and data communication. In addition to those typical functions, the processors  102  and  103  also execute a particular software module (instruction set) stored in the external memory  170  or the internal memory  104  and conduct particular functions corresponding to the module. That is, the processors  102  and  103  carry out the method of the present invention in association with software modules stored in the external memory  170  or the internal memory  104 . 
     According to one exemplary embodiment of the present invention (corresponding to the method of  FIG. 2 ) the application processor  102  receives a voice signal including a wakeup command and a subsequent voice command from a user through the microphone  110 , and performs speech recognition on the voice signal to detect the presence of the wakeup command. When the wakeup command is detected, the application processor  102  may detect a silence duration between the wakeup command and the subsequent voice command in the voice signal. Thus the application processor  102  determines whether the portion of the voice signal corresponding to the voice command begins, and when it does, the application processor  102  sends that portion of the voice signal to a server. Next, the application processor  102  receives a voice recognition result corresponding to the voice command from the server and performs a corresponding operation based on this result. 
     According to another exemplary embodiment of the present invention (corresponding to the method of  FIG. 4 ), the application processor  102  sends to the server all of the voice signal including the wakeup command portion and the voice command portion, and receives a speaker verification result corresponding to the wakeup command from the server. When the result indicates that the wakeup command is detected, the application processor  102  activates the system. Next, the application processor  102  receives a voice recognition result corresponding to the voice command and performs the operation based on the voice recognition result. 
     According to yet another exemplary embodiment of the present invention (corresponding to the method of  FIG. 6 ), the application processor  102  receives the voice signal including the wakeup command and the voice command from the user through the microphone  110 , and performs the wakeup command detection using speech recognition. When the wakeup command is detected, the application processor  102  uses a voice recognition algorithm to recognize a voice command in a subsequent portion of the voice signal and performs the corresponding operation based on the recognized voice command. 
     One or more voice recognition processors and a speaker verification processor can be a part of the application processor  102 , or can be provided as separate processors. The voice recognition processor and the speaker verification processor may be unified, and include a plurality of processors for different functions according to their implementation. The interface  101  interconnects the touch screen controller  165  of the electronic device with the external or internal memory  170  or  104 . 
     The sensor module  150  is coupled to the interface  101  to allow various functions. For example, a motion sensor and an optical sensor can be coupled to the interface  101  to detect a motion of the electronic device or to detect the light from the outside. Besides these, other sensors such as position determining system, temperature sensor, or biometric sensor can be connected to the interface  101  to conduct relevant functions. 
     The camera  120  is coupled to the sensor module  150  through the interface  101  to perform a camera function such as photo and video clip recording. 
     The RF unit  140 , which may include at least one processor, performs a communication function. For example, under control of the communication processor  103 , the RF unit  140  converts an RF signal to a baseband signal and provides the baseband signal to the communication processor  103 , or converts a baseband signal output from the communication processor  103  to an RF signal and transmits the RF signal through an antenna ANT. Here, the communication processor  103  processes the baseband signal according to various communication schemes. For example, the communication scheme can include, but not limited to, a Global System for Mobile communication (GSM) communication scheme, an Enhanced Data GSM Environment (EDGE) communication scheme, a Code Division Multiple Access (CDMA) communication scheme, a W-CDMA communication scheme, a Long Term Evolution (LTE) communication scheme, an Orthogonal Frequency Division Multiple Access (OFDMA) communication scheme, a Wireless Fidelity (Wi-Fi) communication scheme, a WiMax communication scheme, and/or a Bluetooth communication scheme. 
     The speaker/microphone  110  can input and output an audio signal such as one for voice recognition (used during a training process to train device  100  to recognize a particular speaker and/or wakeup command and/or voice command), voice reproduction, digital recording, and telephone function. That is, the speaker/microphone  110  converts the voice signal to an electric signal or converts the electric signal to the voice signal. An attachable and detachable earphone, headphone, or headset (not shown) can be connected to the electronic device through an external port. 
     The touch screen controller  165  can be coupled to the touch screen  160 . The touch screen  160  and the touch screen controller  165  can detect the touch and the motion or their cessation using, but not limited to, capacitive, resistive, infrared and surface sound wave techniques for determining one or more touch points with the touch screen  160  and a multi-touch detection technique including various proximity sensor arrays or other elements. 
     The touch screen  160  provides an input/output interface between the electronic device and the user. That is, the touch screen  160  forwards a user&#39;s touch input to electronic device  100 . The touch screen  160  also presents an output of device  100  to the user. That is, the touch screen  160  presents a visual output to the user. Here, the visual output can be represented as text, graphic, video, and a combination of these. 
     The touch screen  160  can employ various displays, examples of which include, but are not limited to, Liquid Crystal Display (LCD), Light Emitting Diode (LED), Light emitting Polymer Display (LPD), Organic LED (OLED), Active Matrix OLED (AMOLED) or Flexible LED (FLED). 
     The GPS receiver  130  converts a signal received from an “artificial” satellite, to information such as location, speed, or time. For example, a distance between the satellite and the GPS receiver  130  can calculated by multiplying the speed of light by a signal arrival time, and measures the location of the electronic device using the well-known triangulation by obtaining accurate positions and distances of three satellites. 
     The external memory  170  or the internal memory  104  can include fast random access memory such as one or more magnetic disc storage devices and/or non-volatile memory, one or more optical storage devices, and/or a flash memory (e.g., NAND and NOR). 
     The external memory  170  or the internal memory  104  stores software. Software components include an operating system software module, a communication software module, a graphic software module, a user interface software module, an MPEG module, a camera software module, and one or more application software modules. Since the module being the software component can be a set of instructions, the module can be referred to as an instruction set. The module may be referred to as a program. 
     The operating system software includes various software components for controlling general system operations. The control of the general system operations includes, for example, memory management and control, storage hardware (device) control and management, and power control and management. The operating system software may process normal communication between various hardware devices and the software components (modules). 
     The communication software module allows communication with other electronic devices such as computer, server, and/or portable terminal, through the RF unit  140 . The communication software module is configured in a protocol architecture of the corresponding communication scheme. 
     The graphic software module includes various software components for providing and displaying graphics on the touch screen  160 . The term ‘graphics’ embraces text, webpage, icon, digital image, video, animation, and the like. 
     The user interface software module includes various software components relating to a user interface. The user interface software module is involved in the status change of the user interface and the condition of the user interface status change. 
     The camera software module includes camera related software components allowing camera related processes and functions. The application module includes a browser, an e-mail, an instant message, a word processing, keyboard emulation, an address book, a touch list, a widget, Digital Right Management (DRM), voice recognition, voice reproduction, a position determining function, a location based service, and the like. The memories  170  and  104  can include an additional module (instructions) in addition to the above-stated modules. Alternatively, if necessary, some module (instructions) may not be used. 
     Herein, the application module includes an instruction for carrying out a speaker recognition function or a speech recognition function and a voice command execution function. The instructions according to exemplary embodiments of the present invention correspond to those for executing the operations illustrated in  FIGS. 2, 4 and 6 . 
     The various functions of electronic device  100  as mentioned above and to be explained, can be executed in hardware and/or software and/or their combination including one or more signal processing and/or Application Specific Integrated Circuits (ASICs). 
       FIG. 1B  illustrates a system  195  for executing voice commands according to an embodiment of the present invention. System  195  includes the portable terminal  100  which communicates with a server  190  through a network  180 . Server  190  can be e.g., a home network server, or a remote server accessed through a large network such as the Internet. Alternatively, server  190  can be a third party portable electronic device capable of performing a speech/voice/speaker recognition and analysis function on voice signals transmitted thereto. Server  190  includes a minimum of at least one processor  192  and a memory  194  to perform a host of operations. Exemplary operations of the server  190  in conjunction with electronic device  100  will be described hereafter. 
       FIG. 2  is a flowchart of a method  200  for executing wakeup and voice commands in the electronic device  100  according to one exemplary embodiment of the present invention. 
     At step  201 , the electronic device  100  detects a voice signal which may contain the wakeup command and the voice command from the user through the microphone  110 . The wakeup command activates a voice command mode of the system, in which no touch contact is required with the touchscreen or a key in order to receive and analyze a voice command. Prior to receiving this voice signal, the device  100  can be in an idle mode or a lockscreen mode. In some embodiments, prior to receiving the voice signal, the device  100  can be in an application execution mode in which no listening for voice commands or operations responsive to voice commands are executed. 
     In the following description, it will be assumed that the wakeup command is typically independent of a voice command that temporally follows the wakeup command. However, in some “speaker-dependent” embodiments also discussed below, any voice signal detected to be spoken by a predetermined speaker can serve as a wakeup command. In still other embodiments (speaker dependent or speaker independent), the wakeup command also contains an inherent voice command. In the latter case, the wakeup command both activates the voice command mode and is a catalyst for the device  100  to perform an additional predetermined task, such as running a predefined application set by the user. 
     For example, the wakeup command can instruct to switch to a mode for inputting the voice command (“voice command mode”) and/or to unlock the screen. The voice command executes various functions provided by the electronic device  100 . For example, the voice command executes dialing, photographing, MP3 playing, and so on. In various implementations, the voice command can request the server  190  to search a map and to plan a route. 
     In step  202 , the electronic device  100  performs speech recognition on the voice signal to discern whether the voice signal contains a predetermined wakeup command. This speech recognition can include a speaker dependent recognition scheme in one embodiment, or a speaker independent recognition scheme in another embodiment. Additional schemes are possible where a number of different wakeup commands are predetermined, in which one or more predetermined commands is a speaker dependent wakeup command and one or more other commands is a speaker independent command. 
     According to the speaker dependent recognition scheme, a particular speaker or user needs to train a recognizer with his/her own voice in advance. In this case, the speech recognizer can recognize only the speech of the trained voice. The speaker independent recognition scheme can recognize speech of an arbitrary speaker voice. The speaker independent recognition scheme extracts and databases information about hundreds or thousands of voices in advance, and thus any user can use it without a separate training process. 
     Using the speaker dependent recognition, in some embodiments, the speaker can be verified using the voice command portion of the voice signal (which may comprise the entire voice signal). Hence, there is no need to input a separate wakeup command. For example, when the speaker is verified using unique voice characteristics of the user, there is no need to input the separate wakeup command. Accordingly, in these embodiments, the voice command can also operate as the wakeup command. Thus, in steps  202  and  204 , the specific voice of the particular user is recognized, and wakeup command is automatically detected via this recognition. 
     Alternatively, when using the speaker dependent recognition scheme, a speaker verification is performed based on the information of a voice signal corresponding to a word(s) that is predefined, or set by a user in advance through repeated voice training. The user can train the device  100  to verify the speaker (and a specific wakeup command(s)) by inputting his voice corresponding to a predefined text. In so doing, it is necessary to input the wakeup command. Herein, the predefined text can be input directly by the user or converted by inputting the voice several times. The electronic device  100  or the server  190  can convert the voice to the text. 
     When the wakeup command is detected in step  204 , the method proceeds to step  206 . Otherwise, it returns to  201 . 
     Although not illustrated in  FIG. 2 , when the wakeup command is successfully detected, an “object for recognizing the voice command” is activated on the display in the locked screen (see  FIG. 8A ). This object, which may be a virtual microphone, indicates activation of the voice command mode, i.e., that the device is actively listening for voice commands. At this time, the object may be firstly displayed, or, displayed in an emphasized manner if a faded version was previously visible, in the locked screen. A Graphical User Interface (GUI) relating to the speech/voice recognition can also be displayed at this time. Alternatively, when the wakeup command is detected, the displayed object can be activated and the GUI relating to the voice recognition can be immediately displayed in the unlocked screen. 
     In an embodiment variation, when the wakeup command is detected in the idle mode and the screen is locked, the object for recognizing the voice command and the GUI relating to the voice recognition are displayed together. When the screen is not locked, the object for recognizing the voice command and the GUI relating to the voice recognition can also be displayed together. 
     In step  206 , the electronic device  100  detects a silence duration (if one exists) between a first portion of the detected voice signal (hereafter, “first voice signal”) corresponding to the wakeup command and a second portion of the detected voice signal (hereafter, “second voice signal”) corresponding to the voice command. Of course, this assumes that the voice command is a separate entity than the wakeup command (as mentioned above, an embodiment is possible where the wakeup command is also a voice command). For example, assuming that the wakeup command is “Hi Galaxy” and the voice command is “Call Hong Gil-dong”, when the user consecutively pronounces “Hi Galaxy” and “Call Hong Gil-dong”, a silence duration exists between “Hi Galaxy” and “Call Hong Gil-dong”. 
     A short pause between two words in the detected speech can be used to detect the start of the voice command. In an embodiment, an extraneous portion of the detected voice signal immediately following the wakeup command can be blocked from being sent to the server together with the ensuing voice command. For doing so, a Voice Activity Detection (VAD) technique can be used. For example, a voice signal typically has more energy than a background noise signal including the “silence” period. However, when background noise is low, unique characteristics of the human voice can be additionally identified. Typically, the unique characteristics of the human voice are identified by observing energy distribution throughout various frequencies. The human voice includes characteristics signature but no noise. Hence, the VAD technique can distinguish speech from a silence period including background noise. Accordingly, in an embodiment, instead of transmitting to the server an audio signal including all sounds detected subsequent to the wakeup command, the device  100  waits until speech is detected, and thereafter transmits only sound signals beginning with the detected speech that follows the wakeup command. That is, the method  200  avoids transmitting signals containing just noise of a silent period following a wakeup command detection. 
     In step  208 , device  100  determines whether the second voice signal corresponding to the voice command begins. For example, device  100  checks the start point of the voice signal corresponding to “Call Hong Gil-dong”. When the second voice signal begins, device  100  at step  210  sends the voice signal corresponding to the voice command (e.g., “Call Hong Gil-dong”) to the server. (The portion of the voice signal transmitted to the server is variously referred to herein as “the transmit signal.) (When the voice signal corresponding to the voice command does not begin at  208 , the flow returns to  206 .) Advantageously, by transmitting the voice command to the server, device  100  is freed from the processor intensive task of recognizing the speech of the voice command. 
     In step  212 , device  100  receives the voice recognition result corresponding to the voice command from the server. For example, the server analyzes the voice command “Call Hong Gil-dong”, and sends a control signal corresponding to “Call Hong Gil-dong” to device  100  or sends a search result of the route planning request or the map search request. 
     In step  214 , device  100  performs the corresponding operation based on the voice recognition result corresponding to the voice command, or displays a result corresponding to the voice recognition. For example, when receiving the control signal corresponding to “Call Hong Gil-dong” from the server, device  100  searches a phonebook for a phone number of Hong Gil-dong and tries to connect the call with the searched phone number. In the case of the map/route request, device  100  displays the search result of the route planning request or the map search request. Thereafter, the process ends. 
       FIG. 3  is a flowchart illustrating a method,  300 , performed by server  190  according to one exemplary embodiment of the present invention. This method may complement the operations of the above-described method  200  operating in device  100 . In this embodiment, the server receives the transmit signal, i.e., the voice signal corresponding to the voice command (e.g., “Call Hong Gil-dong”) from the electronic device (e.g., transmitted at step  210  of  FIG. 2 ) in step  301 . 
     Next, the server analyzes the voice signal corresponding to the voice command using a voice recognition algorithm (equivalently, “speech recognition” algorithm) in step  302 . That is, the server analyzes the voice signal to recognize speech and discern a voice command from the recognized speech. The server then determines whether the result corresponding to the voice recognition is a control signal in step  304 . If so, the server sends the control signal corresponding to the voice recognition to device  100  in step  306 . For example, after recognizing “Call Hong Gil-dong”, the server provides the corresponding control signal to device  100  to instruct device  100  to call Hong Gil-dong at an associated phone number extracted from a phone book storage thereof. 
     When the result corresponding to the voice recognition is not the control signal, the server provides the result corresponding to the voice recognition to the electronic device in step  308 . Alternatively, the server sends image content containing the search result of the route planning request or the map search request, whereby the device  100  displays the content. 
     Accordingly, in the exemplary embodiments of methods  200  and  300 , the electronic device fulfills the wakeup command detection and the server fulfills the voice recognition of the voice command. According to another exemplary embodiment of the present invention, the server carries out both of the wakeup command detection and the voice recognition of the voice command. 
       FIG. 4  is a flowchart of another example method,  400 , performed in device  100  according to another exemplary embodiment of the present invention. Here, in an idle mode and/or locked screen mode, device  100  receives a voice signal including the wakeup command followed shortly thereafter (or continuously thereafter) by the voice command from the user through the microphone  110  in step  401 . As described earlier, the wakeup command, when recognized, activates the system. For example, the wakeup command can instruct to switch to the mode for inputting the voice command and/or to unlock the screen. The voice command commands execution of various functions provided by the electronic device  100 . For example, the voice command executes dialing, photographing, MP3 playing, and so on. 
     In step  402 , device  100  sends the entire voice signal including the wakeup command and the voice command, to the server as the transmit signal. Next, a voice verification result corresponding to the wakeup command is received from the server (step  404 ). That is, when the server detects that the transmit signal contains the wakeup command, it sends the voice recognition result that is received in step  404 ; otherwise, the server may not send any recognition signal back to device  100 . For example, when device  100  receives the recognition result at step  404 , this indicates that the wakeup command was detected, and device  100  activates the system in step  406 . The system activation unlocks the screen or switches from the idle mode to an active mode or voice command mode. (With the system activated and in voice command mode, device  100  may subsequently detect new voice signals containing voice commands as in step  401  and repeat steps  402 - 404  and subsequent steps accordingly.) 
     Next, device  100  receives the voice recognition result corresponding to the voice command in step  408 , and performs the operation based on the voice recognition result or displays the result corresponding to the voice recognition in step  410 . For example, when receiving the control signal corresponding to “Call Hong Gil-dong” from the server, device  100  searches the phonebook for the phone number of Hong Gil-dong and tries to connect the call with the searched phone number. In the map/route example, device  100  displays the search result of the route planning request or the map search request. Thereafter, the process ends, and device  100  may receive new voice signals at step  401  and forward these to the server for processing, whereby the server may continue to respond by sending control signals and/or results corresponding to the subsequent voice commands. That is, steps  401  through  410  may be repeated with relevant operations only for the voice commands, but of course not for the wakeup command since the device  100  has already been awakened. 
       FIG. 5  is a flowchart of an exemplary method  500  performed by server  190  according to another exemplary embodiment of the present invention. This method may complement the operations of the above-described method  400  operating in device  100 . 
     At step  501 , the server receives the voice signal including the wakeup command and the voice command from the electronic device  501  (i.e., the transmit signal transmitted at step  402 ). In step  502 , the server analyzes the voice signal corresponding to the wakeup command using the voice recognition algorithm. That is, the server analyzes the voice signal corresponding to the wakeup command and thus determines whether or not the wakeup command is detected. This operation may be the same as that of steps  202  and  204  in  FIG. 2  performed by device  100  in that embodiment. Note that a speaker-dependent and/or speaker independent recognition operation may be performed, as in the embodiment of  FIG. 2 . (Both types of recognition schemes may be employed if multiple predetermined wakeup commands are under consideration.) 
     In step  504 , the server provides a speech verification result to the electronic device. (Note that step  504  may be omitted in other implementations.) 
     When the wakeup command is detected in step  506  as a result of the speech recognition processing, the server then analyzes the voice signal corresponding to the voice command using the voice recognition algorithm in step  508 . That is, the server recognizes the speech corresponding to the voice command, and generates a response signal corresponding to an action to be performed by device  100  for the particularly discerned voice command. By contrast, when the wakeup command is not detected in the voice signal, the flow returns to step  501 . To this end, the server may transmit a signal informing device  100  that no wakeup command has been detected, whereby device  100  may continue to transmit to the server newly detected voice signals at step  501 . In various implementations, when the voice signal corresponding to the previous voice command is normal, the server can request and receive only the first voice signal corresponding to the wakeup command. 
     Although not illustrated, the server can detect a silence duration between the voice signal corresponding to the wakeup command and the voice signal corresponding to the voice command, and thus distinguish the wakeup command and the voice command. 
     In step  510 , the server notifies the wakeup command result and the voice recognition result (the response signal) to the electronic device. For example, the server determines whether the wakeup command is detected by analyzing whether the speech contains the phrase “Hi Galaxy”, analyzes the voice command “Call Hong Gil-dong”, and thus sends the control signal corresponding to “Call Hong Gil-dong” to the electronic device  100 . 
     Next, the server finishes this process, and may be configured to listen for subsequent voice signal transmissions from device  100  as in step  501 . To this end, suitable signaling between device  100  and server  190  can be designed to inform server  190  if device  100  has returned to an idle mode or a lock screen mode. If so, the server would treat a subsequently received voice signal as one that may contain the wakeup command. If not, the server would naturally just listen for a new voice command. 
       FIG. 6  is a flowchart depicting operations of an example method,  600 , performed by the electronic device according to yet another exemplary embodiment of the present invention. In this embodiment, the electronic device carries out both the wakeup command detection and the voice recognition for the voice commands. 
     Steps  601 ,  602 ,  604 ,  606  and  608  may be the same as steps  201 ,  202 ,  204 ,  206  and  208 , respectively, of  FIG. 2 . The following description of steps  601 - 608  reiterates some of the concepts described in connection with steps  201 - 208 . 
     At step  601 , in the idle mode or in the locked screen, the electronic device  100  receives the voice signal including the wakeup command and the voice command from the user through the microphone  110 . The wakeup command activates the system. For example, the wakeup command can instruct to switch to the mode for inputting the voice command or to unlock the screen. The voice command executes various functions provided by the electronic device  100 . For example, the voice command executes dialing, photographing, MP3 playing, and so on. 
     In step  602 , device  100  analyzes the voice signal using a speech recognition algorithm (voice recognition algorithm) to determine whether the voice signal contains the wakeup command. As explained earlier, if speaker-dependent recognition is employed, this operation may involve merely detecting that the voice matches a predetermined voice, or that the predetermined voice also contains particular speech matching a predetermined wakeup command(s). Alternatively, a speaker-independent recognition scheme may be utilized. When the wakeup command is recognized in step  604 , the flow proceeds to step  606 ; otherwise, it returns to step  600 . 
     In step  606 , device  100  detects the silence duration between the voice signal portion corresponding to the wakeup command and the voice signal portion corresponding to the voice command. For example, provided that the wakeup command is “Hi Galaxy” and the voice command is “Call Hong Gil-dong”, when the user consecutively pronounces “Hi Galaxy” and “Call Hong Gil-dong”, the silence duration lies between “Hi Galaxy” and “Call Hong Gil-dong”. 
     In step  608 , the electronic device  100  determines whether the voice signal corresponding to the voice command begins. For example, the electronic device  100  checks the start point of the voice signal corresponding to “Call Hong Gil-dong” in step  608 . 
     When the voice signal corresponding to the voice command begins in step  608 , the electronic device  100  analyzes the voice signal corresponding to the voice command using the voice recognition algorithm in step  610 . 
     In step  612 , the electronic device  100  performs the corresponding operation based on the recognized voice command. For example, when the recognized voice command is “Call Hong Gil-dong”, the electronic device  100  searches the phonebook for the phone number of Hong Gil-dong and tries to connect the call with the searched phone number. Thereafter, the process ends. 
       FIG. 7  depicts an example voice signal including a wakeup command and a voice command that may be analyzed in the embodiments described above. The illustrative voice signal input to device  100  may contain a wakeup command and a voice command in succession. That is, the voice signal may have a portion  700  corresponding to the wakeup command and a portion  720  corresponding to the voice command, which are successively input to the electronic device. A silence duration portion  720  lies between the wakeup portion  700  and the voice command portion  720 . 
       FIGS. 8A, 8B and 8C  are screenshots depicting a dialing operation using the voice signal including the wakeup command and the voice command according to an exemplary embodiment of the present invention. As shown in  FIG. 8A , an icon object  800  for recognizing the voice command is activated according to the voice signal portion  700  corresponding to the wakeup command. The voice command (“Call Hong Gil-dong”) corresponding to the voice command portion  720  of the voice signal is recognized as shown in  FIG. 8B , and then the operation is conducted according to the voice command. For example, the phone number of Hong Gil-dong is searched in the phonebook and the call connection automatically commences with, the searched phone number as shown in  FIG. 8C . 
       FIGS. 9A and 9B  depict screenshots of a screen unlocked through speech recognition and control operations according to an exemplary embodiment of the present invention.  FIG. 9A  depicts an example lock screen;  FIG. 9B  shows an example unlocked screen. The process of unlocking the locked screen to generate the unlocked screen as illustrated in  FIGS. 9A and 9B  can be performed in any of the above-described methods of  FIGS. 2, 4 and 6  (e.g., steps  214 ,  406 ,  410  or  612 ). 
     In response to detection of the wakeup command portion  700  of the voice signal matching a predetermined wakeup command or matching a particular user&#39;s voice, the locked screen of  FIG. 9A  is switched to the unlocked screen of  FIG. 9B . Although not depicted, the corresponding operation can be performed by recognizing the voice command portion  720  corresponding to the voice command (“Call Hong Gil-dong”) following the voice signal  700  corresponding to the wakeup command after the screen is unlocked. 
     In the exemplary embodiments of the present invention described above, the wakeup command and the voice command are separated. Alternatively, the voice signal corresponding to the voice command can be used for both of the speaker verification and the voice command. Namely, the speaker is verified with the voice signal corresponding to the voice command. When the speaker verification is successful, the corresponding function of the electronic device can be controlled or executed according to the voice command. 
     The above-described methods according to the present disclosure can be implemented in hardware or software alone or in combination. 
     For software, a computer-readable storage medium containing one or more programs (software modules) can be provided. One or more programs stored to the computer-readable storage medium are configured for execution of one or more processors of the electronic device and/or the server. One or more programs include instructions making the electronic device and/or the server execute the methods according to the embodiments as described in the claims and/or the specification of the present disclosure. 
     Such programs (software module, software) can be stored to a random access memory, a non-volatile memory including a flash memory, a Read Only Memory (ROM), an Electrically Erasable Programmable ROM (EEPROM), a magnetic disc storage device, a Compact Disc ROM (CD-ROM), Digital Versatile Discs (DVDs) or other optical storage devices, and a magnetic cassette. Alternatively, the programs can be stored to a memory combining part or all of those recording media. A plurality of memories may be equipped. 
     The programs can be stored to an attachable storage device of the electronic device and/or the server accessible via the communication network such as Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a communication network by combining the networks. The storage device can access the electronic device and/or the server through an external port. 
     A separate storage device in the communication network can access the portable electronic device/server. 
     As set forth above, since the detected voice signal including the wakeup command portion and the voice command portion is processed, the user can easily execute the voice command. 
     In addition, since the wakeup command detection is fulfilled before the voice command is executed, the voice command can be carried out based on security/personal information protection. 
     While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.