Patent Publication Number: US-2022225009-A1

Title: Method for controlling electronic devices based on battery residual capacity and electronic device therefor

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation of International Application No. PCT/KR2022/000066, filed on Jan. 4, 2022, which claims priority to Korean Patent Application No. 10-2021-0004812, filed on Jan. 13, 2021 in the Korean Intellectual Property Office, the disclosures of which are herein incorporated by reference. 
    
    
     TECHNICAL FIELD 
     Certain embodiments disclosed herein relate to a method for controlling electronic devices, based on the battery&#39;s residual capacity, and an electronic device therefor. 
     BACKGROUND ART 
     Electronic devices, such as earphones, include speakers and microphones, and are thus capable of outputting audio data including music or a voice via the speakers, and acquiring audio data via the microphones. Recently, earphones have developed to include various sensors, communication modules, and processors in addition to speakers and microphones. These earphones can transmit or receive various data, or receive and output audio data by being connected, via a short-range wireless technology such as Bluetooth, to various types of external electronic devices (or sound source electronic devices), for example, a mobile communication terminal, a personal digital assistant (PDA), an electronic organizer, a smartphone, a tablet personal computer (PC), and a wearable device. 
     An earphone may detect the user&#39;s posture/body position and calculate a posture value to determine how to render audio data. The earphone detects the user&#39;s posture by using sensors. Thus, based on the sensor values, the earphone determines the posture value of the user&#39;s posture. The ear phone may output audio data rendered with respect to the user&#39;s posture. 
     Where there are multiple earphones, one earphone can calculate a posture value and transmit the same to a sound source or electronic device providing the sound source. However, detecting the user&#39;s posture may result in heave battery consumption. This can lead to a situation where the earphone that calculates the posture value has insufficient battery power. Moreover, this can occur, while the other earphone(s) have sufficient battery power. 
     SUMMARY 
     An electronic device comprises: a memory; a battery; a speaker; a sensor module; a communication module; and a processor electrically connected to the memory, the battery, the speaker, the sensor module, and the communication module, wherein the processor is configured to: control the communication module to establish a first communication link with a sound source electronic device and transmit a first posture value calculated based on a sensor value obtained from the sensor module over the first communication link, receive audio data rendered based on the posture value from the sound source electronic device, communicate, based on device state information of the electronic device, with an external electronic device through a second communication link so as to request a role switching preparation, and transmit a role switching message to the external electronic device and notify the sound source electronic device of role switching with the external electronic device. 
     A method for an electronic device comprising a sensor module, comprises: establishing a first communication link with a sound source electronic device and transmitting to the sound source electronic device, a first posture value calculated based on a sensor value obtained from the sensor module; receiving audio data rendered based on the posture value from the sound source electronic device; communicating, based on device state information, with an external electronic device, through a second communication link so as to request a role switching preparation; transmitting a role switching message to the external electronic device; and notifying the sound source electronic device of role switching with the external electronic device. 
     An electronic device comprises: a memory; a communication module; and a processor electrically connected to the memory and the communication module, wherein the processor is configured to: control the communication module to establish a first communication link with a first electronic device and receive a posture value of the first electronic device that performs a primary role, transmit audio data rendered based on the posture value to the first electronic device, receive a posture value of a second electronic device after receiving notification of role switching from the first electronic device, and transmit audio data rendered based on the posture value from the second electronic device to at least one of the first electronic device or the second electronic device. 
     Certain embodiments disclosed herein are to provide a method for controlling electronic devices, based on a battery residual capacity, and an electronic device therefor. 
     The technical task to be achieved by the disclosure is not limited to that mentioned above, and other technical tasks that are not mentioned above may be clearly understood to those skilled in the art based on the description provided below. 
     The operation of multiple electronic devices can be controlled based on battery residual capacity information. 
     The role of an electronic device, among multiple electronic devices, which calculates a posture value and transmits the same to a sound source electronic device can be switched based on battery residual capacity information. 
     The battery efficiency of multiple electronic devices can be increased by controlling the roles of the multiple electronic devices, based on battery residual capacity information. 
     Various other effects directly or indirectly recognized herein can also be provided. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       In relation to the description of drawings, the same or similar elements may be indicated by the same or similar reference signs. 
         FIG. 1  is a block diagram of an electronic device in a network environment according to certain embodiments; 
         FIG. 2  is a configuration diagram of electronic devices and a sound source electronic device according to certain embodiments; 
         FIG. 3  is a block diagram of electronic devices according to certain embodiments; 
         FIG. 4  is a diagram illustrating a posture value calculation operation according to certain embodiments; 
         FIG. 5  is a diagram illustrating an audio rendering operation based on a posture value according to certain embodiments; 
         FIG. 6A  and  FIG. 6B  are configuration diagrams of electronic devices and a sound source electronic device according to certain embodiments; 
         FIG. 7  is a flowchart illustrating a role switching method for a first electronic device according to certain embodiments; and 
         FIG. 8  is a flowchart illustrating a role switching method for a second electronic device according to certain embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     In a 360-degree audio system, the earphones provide sound to left and right ears that simulate the sound that a person would hear if they were actually present when the recorded sound occurred. For example, if the user rotates 180 degrees, their left ear will be in approximately the same place that the right ear was previously in, and vice versa. In the 360-degree audio system, the sound that was previously heard in the right ear would now be heard in the left ear, and vice versa. This will be described in further detail in  FIG. 4 . 
     The term earphone call be understood to collectively refer to earbuds, headphones, and earphones. 
       FIG. 1  is a block diagram illustrating an electronic device  101  in a network environment  100  according to certain embodiments. Referring to  FIG. 1 , the electronic device  101  in the network environment  100  may communicate with an electronic device  102  via a first network  198  (e.g., a short-range wireless communication network), or at least one of an electronic device  104  or a server  108  via a second network  199  (e.g., a long-range wireless communication network). The electronic device  101  may communicate with the electronic device  104  via the server  108 . The electronic device  101  may include a processor  120 , memory  130 , an input module  150 , a sound output module  155 , a display module  160 , an audio module  170 , a sensor module  176 , an interface  177 , a connecting terminal  178 , a haptic module  179 , a camera module  180 , a power management module  188 , a battery  189 , a communication module  190 , a subscriber identification module(SIM)  196 , or an antenna module  197 . In some embodiments, at least one of the components (e.g., the connecting terminal  178 ) may be omitted from the electronic device  101 , or one or more other components may be added in the electronic device  101 . In some embodiments, some of the components (e.g., the sensor module  176 , the camera module  180 , or the antenna module  197 ) may be implemented as a single component (e.g., the display module  160 ). 
     The processor  120  may execute, for example, software (e.g., a program  140 ) to control at least one other component (e.g., a hardware or software component) of the electronic device  101  coupled with the processor  120 , and may perform various data processing or computation. According to one embodiment, as at least part of the data processing or computation, the processor  120  may store a command or data received from another component (e.g., the sensor module  176  or the communication module  190 ) in volatile memory  132 , process the command or the data stored in the volatile memory  132 , and store resulting data in non-volatile memory  134 . The processor  120  may include a main processor  121  (e.g., a central processing unit (CPU) or an application processor (AP)), or an auxiliary processor  123  (e.g., a graphics processing unit (GPU), a neural processing unit (NPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)) that is operable independently from, or in conjunction with, the main processor  121 . For example, when the electronic device  101  includes the main processor  121  and the auxiliary processor  123 , the auxiliary processor  123  may be adapted to consume less power than the main processor  121 , or to be specific to a specified function. The auxiliary processor  123  may be implemented as separate from, or as part of the main processor  121 . 
     The auxiliary processor  123  may control at least some of functions or states related to at least one component (e.g., the display module  160 , the sensor module  176 , or the communication module  190 ) among the components of the electronic device  101 , instead of the main processor  121  while the main processor  121  is in an inactive (e.g., sleep) state, or together with the main processor  121  while the main processor  121  is in an active state (e.g., executing an application). The auxiliary processor  123  (e.g., an image signal processor or a communication processor) may be implemented as part of another component (e.g., the camera module  180  or the communication module  190 ) functionally related to the auxiliary processor  123 . The auxiliary processor  123  (e.g., the neural processing unit) may include a hardware structure specified for artificial intelligence model processing. An artificial intelligence model may be generated by machine learning. Such learning may be performed, e.g., by the electronic device  101  where the artificial intelligence is performed or via a separate server (e.g., the server  108 ). Learning algorithms may include, but are not limited to, e.g., supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning. The artificial intelligence model may include a plurality of artificial neural network layers. The artificial neural network may be a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), deep Q-network or a combination of two or more thereof but is not limited thereto. The artificial intelligence model may, additionally or alternatively, include a software structure other than the hardware structure. 
     The memory  130  may store various data used by at least one component (e.g., the processor  120  or the sensor module  176 ) of the electronic device  101 . The various data may include, for example, software (e.g., the program  140 ) and input data or output data for a command related thererto. The memory  130  may include the volatile memory  132  or the non-volatile memory  134 . 
     The program  140  may be stored in the memory  130  as software, and may include, for example, an operating system (OS)  142 , middleware  144 , or an application  146 . 
     The input module  150  may receive a command or data to be used by another component (e.g., the processor  120 ) of the electronic device  101 , from the outside (e.g., a user) of the electronic device  101 . The input module  150  may include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen). 
     The sound output module  155  may output sound signals to the outside of the electronic device  101 . The sound output module  155  may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as playing multimedia or playing record. The receiver may be used for receiving incoming calls. The receiver may be implemented as separate from, or as part of the speaker. 
     The display module  160  may visually provide information to the outside (e.g., a user) of the electronic device  101 . The display module  160  may include, for example, a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, hologram device, and projector. The display module  160  may include a touch sensor adapted to detect a touch, or a pressure sensor adapted to measure the intensity of force incurred by the touch. 
     The audio module  170  may convert a sound into an electrical signal and vice versa. The audio module  170  may obtain the sound via the input module  150 , or output the sound via the sound output module  155  or a headphone of an external electronic device (e.g., an electronic device  102 ) directly (e.g., wiredly) or wirelessly coupled with the electronic device  101 . 
     The sensor module  176  may detect an operational state (e.g., power or temperature) of the electronic device  101  or an environmental state (e.g., a state of a user) external to the electronic device  101 , and then generate an electrical signal or data value corresponding to the detected state. The sensor module  176  may include, for example, a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. 
     The interface  177  may support one or more specified protocols to be used for the electronic device  101  to be coupled with the external electronic device (e.g., the electronic device  102 ) directly (e.g., wiredly) or wirelessly. The interface  177  may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface. 
     A connecting terminal  178  may include a connector via which the electronic device  101  may be physically connected with the external electronic device (e.g., the electronic device  102 ). The connecting terminal  178  may include, for example, a HDMI connector, a USB connector, a SD card connector, or an audio connector (e.g., a headphone connector). 
     The haptic module  179  may convert an electrical signal into a mechanical stimulus (e.g., a vibration or a movement) or electrical stimulus which may be recognized by a user via his tactile sensation or kinesthetic sensation. The haptic module  179  may include, for example, a motor, a piezoelectric element, or an electric stimulator. 
     The camera module  180  may capture a still image or moving images. The camera module  180  may include one or more lenses, image sensors, image signal processors, or flashes. 
     The power management module  188  may manage power supplied to the electronic device  101 . According to one embodiment, the power management module  188  may be implemented as at least part of, for example, a power management integrated circuit (PMIC). 
     The battery  189  may supply power to at least one component of the electronic device  101 . The battery  189  may include, for example, a primary cell which is not rechargeable, a secondary cell which is rechargeable, or a fuel cell. 
     The communication module  190  may support establishing a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device  101  and the external electronic device (e.g., the electronic device  102 , the electronic device  104 , or the server  108 ) and performing communication via the established communication channel. The communication module  190  may include one or more communication processors that are operable independently from the processor  120  (e.g., the application processor (AP)) and supports a direct (e.g., wired) communication or a wireless communication. The communication module  190  may include a wireless communication module  192  (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module  194  (e.g., a local area network (LAN) communication module or a power line communication (PLC) module). A corresponding one of these communication modules may communicate with the external electronic device via the first network  198  (e.g., a short-range communication network, such as Bluetooth™, wireless-fidelity (Wi-Fi) direct, or infrared data association (IrDA)) or the second network  199  (e.g., a long-range communication network, such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., LAN or wide area network (WAN)). These various types of communication modules may be implemented as a single component (e.g., a single chip), or may be implemented as multi components (e.g., multi chips) separate from each other. The wireless communication module  192  may identify and authenticate the electronic device  101  in a communication network, such as the first network  198  or the second network  199 , using subscriber information (e.g., international mobile subscriber identity (IMSI)) stored in the subscriber identification module  196 . 
     The wireless communication module  192  may support a 5G network, after a 4G network, and next-generation communication technology, e.g., new radio (NR) access technology. The NR access technology may support enhanced mobile broadband (eMBB), massive machine type communications (mMTC), or ultra-reliable and low-latency communications (URLLC). The wireless communication module  192  may support a high-frequency band (e.g., the mmWave band) to achieve, e.g., a high data transmission rate. The wireless communication module  192  may support various technologies for securing performance on a high-frequency band, such as, e.g., beamforming, massive multiple-input and multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module  192  may support various requirements specified in the electronic device  101 , an external electronic device (e.g., the electronic device  104 ), or a network system (e.g., the second network  199 ). The wireless communication module  192  may support a peak data rate (e.g., 20 Gbps or more) for implementing eMBB, loss coverage (e.g., 164 dB or less) for implementing mMTC, or U-plane latency (e.g., 0.5 ms or less for each of downlink (DL) and uplink (UL), or a round trip of 1 ms or less) for implementing URLLC. 
     The antenna module  197  may transmit or receive a signal or power to or from the outside (e.g., the external electronic device) of the electronic device  101 . The antenna module  197  may include an antenna including a radiating element composed of a conductive material or a conductive pattern formed in or on a substrate (e.g., a printed circuit board (PCB)). The antenna module  197  may include a plurality of antennas (e.g., array antennas). In such a case, at least one antenna appropriate for a communication scheme used in the communication network, such as the first network  198  or the second network  199 , may be selected, for example, by the communication module  190  (e.g., the wireless communication module  192 ) from the plurality of antennas. The signal or the power may then be transmitted or received between the communication module  190  and the external electronic device via the selected at least one antenna. According to an embodiment, another component (e.g., a radio frequency integrated circuit (RFIC)) other than the radiating element may be additionally formed as part of the antenna module  197 . 
     The antenna module  197  may form a mmWave antenna module. The mmWave antenna module may include a printed circuit board, a RFIC disposed on a first surface (e.g., the bottom surface) of the printed circuit board, or adjacent to the first surface and capable of supporting a designated high-frequency band (e.g., the mmWave band), and a plurality of antennas (e.g., array antennas) disposed on a second surface (e.g., the top or a side surface) of the printed circuit board, or adjacent to the second surface and capable of transmitting or receiving signals of the designated high-frequency band. 
     At least some of the above-described components may be coupled mutually and communicate signals (e.g., commands or data) therebetween via an inter-peripheral communication scheme (e.g., a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)). 
     According to an embodiment, commands or data may be transmitted or received between the electronic device  101  and the external electronic device  104  via the server  108  coupled with the second network  199 . Each of the electronic devices  102  or  104  may be a device of a same type as, or a different type, from the electronic device  101 . According to an embodiment, all or some of operations to be executed at the electronic device  101  may be executed at one or more of the external electronic devices  102 ,  104 , or  108 . For example, if the electronic device  101  should perform a function or a service automatically, or in response to a request from a user or another device, the electronic device  101 , instead of, or in addition to, executing the function or the service, may request the one or more external electronic devices to perform at least part of the function or the service. The one or more external electronic devices receiving the request may perform the at least part of the function or the service requested, or an additional function or an additional service related to the request, and transfer an outcome of the performing to the electronic device  101 . The electronic device  101  may provide the outcome, with or without further processing of the outcome, as at least part of a reply to the request. To that end, a cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device  101  may provide ultra low-latency services using, e.g., distributed computing or mobile edge computing. In another embodiment, the external electronic device  104  may include an internet-of-things (IoT) device. The server  108  may be an intelligent server using machine learning and/or a neural network. The external electronic device  104  or the server  108  may be included in the second network  199 . The electronic device  101  may be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology or IoT-related technology. 
     The electronic device according to certain embodiments may be one of various types of electronic devices. The electronic devices may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. According to an embodiment of the disclosure, the electronic devices are not limited to those described above. 
     It should be appreciated that certain embodiments of the present disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It is to be understood that a singular form of a noun corresponding to an item may include one or more of the things, unless the relevant context clearly indicates otherwise. As used herein, each of such phrases as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C,” may include any one of, or all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “1st” and “2nd,” or “first” and “second” may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). It is to be understood that if an element (e.g., a first element) is referred to, with or without the term “operatively” or “communicatively”, as “coupled with,” “coupled to,” “connected with,” or “connected to” another element (e.g., a second element), it means that the element may be coupled with the other element directly (e.g., wiredly), wirelessly, or via a third element. 
     As used in connection with certain embodiments of the disclosure, the term “module” may include a unit implemented in hardware, software, or firmware, and may interchangeably be used with other terms, for example, “logic,” “logic block,” “part,” or “circuitry”. A module may be a single integral component, or a minimum unit or part thereof, adapted to perform one or more functions. For example, The module may be implemented in a form of an application-specific integrated circuit (ASIC). 
     Certain embodiments as set forth herein may be implemented as software (e.g., the program  140 ) including one or more instructions that are stored in a storage medium (e.g., internal memory  136  or external memory  138 ) that is readable by a machine (e.g., the electronic device  101 ). For example, a processor (e.g., the processor  120 ) of the machine (e.g., the electronic device  101 ) may invoke at least one of the one or more instructions stored in the storage medium, and execute it, with or without using one or more other components under the control of the processor. This allows the machine to be operated to perform at least one function according to the at least one instruction invoked. The one or more instructions may include a code generated by a complier or a code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Wherein, the term “non-transitory” simply means that the storage medium is a tangible device, and does not include a signal (e.g., an electromagnetic wave), but this term does not differentiate between where data is semi-permanently stored in the storage medium and where the data is temporarily stored in the storage medium. 
     According to an embodiment, a method according to certain embodiments of the disclosure may be included and provided in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or be distributed (e.g., downloaded or uploaded) online via an application store (e.g., PlayStore™), or between two user devices (e.g., smart phones) directly. If distributed online, at least part of the computer program product may be temporarily generated or at least temporarily stored in the machine-readable storage medium, such as memory of the manufacturer&#39;s server, a server of the application store, or a relay server. 
     According to certain embodiments, each component (e.g., a module or a program) of the above-described components may include a single entity or multiple entities, and some of the multiple entities may be separately disposed in different components. According to certain embodiments, one or more of the above-described components may be omitted, or one or more other components may be added. Alternatively or additionally, a plurality of components (e.g., modules or programs) may be integrated into a single component. In such a case, The integrated component may still perform one or more functions of each of the plurality of components in the same or similar manner as they are performed by a corresponding one of the plurality of components before the integration. According to certain embodiments, operations performed by the module, the program, or another component may be carried out sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order or omitted, or one or more other operations may be added. 
     A 360-degree audio system can include two or more earphones  210  and  220  that are electronic device  101 , as well as an external electronic device  230 . It is noted that the earphones  210  and  220  may omit certain features of the electronic device  101 , such as, but not limited to the display module  160 . The external electronic device  230  may also omit certain features. 
       FIG. 2  is a configuration diagram  200  of electronic devices  210  and/or  220  (e.g., the electronic device  102  in  FIG. 1 ) and a sound source electronic device  230  (e.g., the electronic device  101  in  FIG. 1 ) according to certain embodiments. 
     Referring to  FIG. 2 , the electronic devices  210  and/or  220  may include a first electronic device  210  and/or a second electronic device  220 . For example, the electronic devices  210  and/or  220  may be worn on a user, and may include headphones, earphones, and/or earbuds capable of providing a sound to the user, based on audio data received from the sound source electronic device  230  by using a communication function. Hereinafter, an example in which the first electronic device  210  and the second electronic device  220  included in the electronic devices  210  and/or  220  are implemented as earbuds, respectively, will be described, but certain embodiments may not be limited thereto. 
     For ease of understanding, electronic device  210  and  220  may also be referred to as earbuds with the understanding that this disclosure is not limited to earbuds, and further the earbuds are a type of electronic device. 
     The sound source electronic device  230  may be a portable and/or movable electronic device, such as a smartphone, a tablet PC, a portable multimedia player (PMP), a personal digital assistant (PDA), a laptop PC, and a wearable device. 
     The sound source electronic device  230  may be an electronic device capable of reproducing music or an image, and may provide relevant audio data to the electronic devices  210  and/or  220 . 
     The electronic devices  210  and/or  220  may be connected to the sound source electronic device  230  by wireless communication. For example, the sound source electronic device  230  may communicate with the first electronic device  210  or the second electronic device  220  by using a first communication link  201  or a third communication link  203  (e.g., the first network  198  in  FIG. 1 ) including a short-range communication network, such as Bluetooth (or BLE), WiFi direct, or infrared data association (IrDA). 
     The first electronic device  210  and the second electronic device  220  may communicate with each other by using a second communication link  202  (e.g., a short-range wireless communication network). 
     One of the electronic devices  210  and/or  220  may establish communication with the sound source electronic device  230  by performing the role of a primary device (e.g., the first electronic device  210 ). The other one (e.g., the second electronic device  220 ) of the electronic devices  210  and/or  220  may establish communication with the first electronic device  210 , and perform the role of a secondary device. In a case where the first electronic device  210  and the second electronic device  220  are implemented as earbuds, the first electronic device  210  may be called a PE (a primary earbud or primary equipment), and the second electronic device  220  may be called an SE (a secondary earbud or secondary equipment). For example, the first electronic device  210  may communicate, as a primary device, with the sound source electronic device  230  through the first communication link  201 , and the second electronic device  220  may communicate, as a secondary device, with the first electronic device  220  through the second communication link  202 . 
     In this case, the third communication link  203  between the second electronic device  220  and the sound source electronic device  230  may be in an idle state and/or be in a non-connected state. For example, the second electronic device  220  may perform sniffing, as a secondary device, for the first communication link  201  between the first electronic device  210  and the sound source electronic device  230  to obtain data transmitted from the sound source electronic device  230  to the first electronic device  210 . 
     Hereinafter, a case where the first electronic device  210  of the electronic devices  210  and/or  220  may be connected, as a primary device and early in the operation thereof, to the sound source electronic device  230  through the first communication link  201  by communication, and transmits or receives data thereto or therefrom, and the second electronic device  220  may perform sniffing for the first communication link  201  as a secondary device to obtain data may be described as an example. In this case, the third communication link  203  with the sound source electronic device  230  may be in an idle state and/or be in a non-connected state. 
     It is noted that the primary device may use more power than the secondary device. Accordingly, over time, the primary device may have considerably less battery power than the secondary device. The first electronic device  210  and the second earbud  220  can then perform role switching. This allows the earbud with more battery capacity to act as the primary earbud. Accordingly, the earbuds  210  and  220  can function for a longer time. 
     The first electronic device  210 , which is a primary device, may perform role switching with the second electronic device  220 , which is a secondary device, so that the second electronic device  220  operates, as a primary device, to connect to the sound source electronic device  230  through the third communication link  203 , and communicate with same. For example, the first electronic device  210  may switch to the role of a secondary device, communicate with the second electronic device  220 , which is a primary device, through the second communication link  202 , and perform sniffing for the third communication link  203  to obtain data transmitted from the sound source electronic device  230  to the second electronic device  220 . For example, the second electronic device  220  having switched to the role of a secondary device may switch the first communication link  201  with the sound source electronic device  230  to be in an idle state and/or a non-connected state. 
     When the first electronic device  210  obtains a sensor value and performs a posture value calculation operation based on the sensor value according to certain embodiments described later, the first electronic device may allow the second electronic device  220  to perform the posture value calculation operation via role switching with the second electronic device  220 , and operate, in communication, as a primary device communicating with the sound source electronic device  230  while maintaining a state connected to the first communication link  201 . For example, in a case where the battery residual capacity of the first electronic device  210  is high, but an abnormality of a sensor has occurred, the second electronic device  220  may be allowed to obtain a sensor value and perform a posture value calculation operation based on the sensor value. 
       FIG. 3  is a block diagram of electronic devices (e.g., the first electronic device  210 , the second electronic device  220 , and the sound source electronic device  230  in  FIG. 2 ) according to certain embodiments. 
     Each of the first electronic device  210  or the second electronic device  220  may include a sensor module  310  or  320 , a processor  311  or  321 , a memory  312  or  322 , a communication circuit  313  or  323 , a microphone  314  or  324 , a speaker  315  or  325 , a power management circuit  316  or  326 , and/or a battery  317  or  327 . 
     The processor  311  or  321  may, for example, execute software (e.g., a program) to control at least another element (e.g., a hardware or software element) of the first electronic device  210  or the second electronic device  220  connected to the processor  311  or  321 , and perform various data processing or calculation. 
     The memory  312  or  322  may store various data used by at least one element (e.g., the processor  311  or  321 , or the sensor module  310  or  320 ) of the first electronic device electronic device  210  or the second electronic device  220 . The data may include, for example, software (e.g., a program), and input data or output data related to a command related thereto. The memory  312  or  322  may include a volatile memory or a non-volatile memory. 
     The memory  312  or  322  may be combined with the processor  311  or  321  and/or the communication circuit  313  or  323 . 
     As at least a part of the data processing or calculation, the processor  311  or  321  may load, in a volatile memory, a command or data received from another element (e.g., the sensor module  310  or  320  or the communication circuit  313  or  323 ), process the command or data loaded in the volatile memory, and store result data in a nonvolatile memory. 
     The communication circuit  313  or  323  may support establishment of a communication channel through a communication link (e.g., a first communication link  301 , a second communication link  302 , or a third communication link  303 ) between each of the first electronic device  210  or the second electronic device  220  and the sound source electronic device  230  and/or the other electronic device (e.g., the first electronic device  210  or the second electronic device  220 ), and/or execution of communication through the established communication channel. 
     The communication circuit  313  or  323  may include a wireless communication module (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module), or a wired communication module. 
     The communication circuit  313  or  323  may communicate with the sound source electronic device  230  through the first communication link  301  or the third communication link  303  (e.g., a short-range wireless communication network, such as Bluetooth, WiFi direct, or infrared data association (IrDA)). 
     The communication circuit  313  or  323  may communicate with the second electronic device  220  or the first electronic device  210  through the second communication link  302  (e.g., a short-range wireless communication network, such as Bluetooth, WiFi direct, or infrared data association (IrDA)). 
     The communication circuit  313  or  323  may include an antenna module. The antenna module of the communication circuit  313  or  323  may transmit a signal and/or power to the outside (e.g., the sound source electronic device  230 ) or may receive same from the outside. The antenna module of the communication circuit  313  or  323  may include one antenna including a radiator including a conductive pattern or a conductor disposed on a substrate (e.g., a PCB). 
     The antenna module may include multiple antennas. At least one antenna, among the multiple antennas, suitable for a communication scheme used in a wireless communication network, such as the first communication link  301 , the second communication link  302 , and/or the third communication link  303 , may be selected by the communication circuit  313  or  323 . A signal or power may be transmitted or received between the communication circuit  313  or  323  and an external electronic device (e.g., the sound source electronic device  230 ) via the selected at least one antenna. According to an embodiment, another component (e.g., an RFIC) other than the radiator may be additionally provided as a part of the antenna module. 
     The sensor module  310  or  320  may include an acceleration sensor  318  or  328  and a gyro sensor  319  and  329 . The acceleration sensor  318  or  328  and/or the gyro sensor  319  and  329  may sense a movement and/or inertia of the first electronic device  210  or the second electronic device  220 . The acceleration sensor  318  or  328  and/or the gyro sensor  319  and  329  may include a circuit (e.g., integrated circuit (IC)) for controlling the operation of the acceleration sensor  318  or  328  and/or the gyro sensor  319  and  329 . For example, the circuit (e.g., integrated circuit (IC)) for controlling the operation of the acceleration sensor  318  or  328  and/or the gyro sensor  319  and  329  may be included in the first electronic device  210  or the second electronic device  220 , and may be implemented by the processor  311  or  312 . 
     The processor  311  or  321  may calculate a posture value, based on a sensor value obtained from the acceleration sensor  318  or  328  and/or the gyro sensor  319  and  329  of the sensor module  310  or  320 . For example, the posture value may be expressed based on yaw, pitch, and roll values. 
     The speaker  315  or  325  may output an audio signal outside the first electronic device electronic device  210  or the second electronic device  220 . 
     The microphone  314  or  324  may convert a sound obtained thereby into an electrical signal. The processor  311  or  321  may output, by using a sound, an electrical signal processed by the processor  311  or  312 , based on audio data received from the sound source electronic device  230  wirelessly connected to the processor. 
     The power management circuit  316  or  326  may manage power supplied to the first electronic device  210  or the second electronic device  220 . The power management circuit  316  or  326  may perform control such that manage the battery  317  or  327  can supply power required for each element of the first electronic device electronic device  210  or the second electronic device  220 . The power management circuit  316  or  326  may control the state of charge of the battery  317  or  327 . 
     The power management circuit  316  or  326  may charge the battery  317  or  327  by using power supplied from an external power source. 
     The power management circuit  316  or  326  may select a charging scheme (e.g., normal charging or quick charging), based on at least some of the type (e.g., a power adapter, a USB, or wireless charging) of the external power source, the magnitude of power suppliable from the external power source, and/or an attribute of the battery  317  or  327 , and may charge the battery  317  or  327  by using the selected charging scheme. The external power source may be connected to the first electronic device  210  or the second electronic device  220 , for example, by wire through a connector pin, or wirelessly via an antenna included in the communication circuit  313  or  323 . 
     The power management circuit  316  or  326  may determine state-of-charge information (e.g., life time, overvoltage, low voltage, overcurrent, overcharge, over-discharge, overheat, short circuit, or swelling) related to charging of the battery  317  or  327 , and control a charging operation for the battery  317  or  327 , based on the determined state-of-charge information. 
     The processor  311  or  321  may identify a residual power level (battery residual capacity level) of the battery  317  or  327  via the power management circuit  316  or  326 . 
     The battery  317  and  327  may supply power to at least one element of the first electronic device  210  or the second electronic device  220 . The battery  317  or  327  may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, and/or a fuel battery. 
     The sound source electronic device  230  may be a portable and/or movable electronic device, such as a smartphone, a tablet PC, a portable multimedia player (PMP), a personal digital assistant (PDA), a laptop PC, and a wearable device. 
     The sound source electronic device  230  may be an electronic device capable of reproducing music or an image, and may provide relevant audio data to the first electronic device  210  and/or the second electronic device  220 . The sound source electronic device  230  may include elements identical or similar to at least some of the elements of the electronic device  101  illustrated in  FIG. 1 . 
     The sound source electronic device  230  may include a processor  331 , a memory  332 , a communication circuit  333 , and a sensor module  330 . 
     The processor  331  may, for example, execute software (e.g., a program) to control at least another element (e.g., a hardware or software element) of the sound source electronic device  230  connected to the processor  311  or  321 , and perform various data processing or calculation. 
     The memory  332  may store various data used by at least one element (e.g., the processor  331  or the communication circuit  333 ) of the sound source electronic device  230 . The data may include, for example, software (e.g., a program), and input data or output data related to a command related thereto. The memory  332  may include a volatile memory or a non-volatile memory. 
     The memory  332  may store instructions for executing a head tracking audio solution and/or a coordinate calculation app. 
     The memory  332  may be combined with the processor  331  and/or the communication circuit  333 . 
     As at least a part of the data processing or calculation, the processor  331  may load, in a volatile memory, a command or data received from another element (e.g., the memory  332  or the communication circuit  323 ), process the command or data loaded in the volatile memory, and store result data in a nonvolatile memory. 
     The communication circuit  333  may support establishment of a communication channel through a communication link (e.g., the first communication link  301  or the third communication link  303 ) between the sound source electronic device  230  and the first electronic device  210  or the second electronic device  220 , and/or execution of communication through the established communication channel. 
     The communication circuit  333  may include a wireless communication module (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module), or a wired communication module. 
     The communication circuit  333  may communicate with the first electronic device  210  or the second electronic device  220  through the first communication link  301  or the third communication link  303  (e.g., a short-range wireless communication network, such as Bluetooth, WiFi direct, or infrared data association (IrDA)). 
     The processor  331  may render audio data, based on a posture value received from the first electronic device electronic device  210  or the second electronic device  220  through the first communication link  301  or the third communication link  303 , and may transmit the rendered audio data to the first electronic device  210  or the second electronic device  220  through the first communication link  301  or the third communication link  303 . 
     The processor  331  may load the instructions for executing a coordinate calculation app, which are stored in the memory  332 , to execute the coordinate calculation app, and may estimate a posture value of a user&#39;s head (e.g., the head of a user wearing the first electronic device  210  and/or the second electronic device  220 ), based on a posture value received from the first electronic device  210  or the second electronic device  220 . 
     The posture value received from the first electronic device electronic device  210  or the second electronic device  220  may be expressed based on yaw, pitch, and roll values. The posture value received from the first electronic device  210  or the second electronic device  220  may indicate posture information of the first electronic device  210  or the second electronic device  220  inserted in a user&#39;s ear. 
       FIG. 4  is a diagram illustrating a posture value calculation operation according to certain embodiments. 
     Referring to  FIG. 4 , the posture value may be expressed by an azimuth change amount, for example, yaw, pitch, and roll values. Roll  410  may be a value expressing a rotation amount by which a user&#39;s head rotates about x-axis, pitch  420  may be a value expressing a rotation amount by which a user&#39;s head rotates about y-axis, and yaw  430  may be a value expressing a rotation amount by which a user&#39;s head rotates about z-axis. 
     The processor  331  may execute a coordinate calculation app, and calculate a posture value indicating posture information reflecting a user&#39;s head movement through, for example, conversion of a coordinate system with respect to a posture value which may correspond to a posture caused by a movement of the first electronic device  210  or the second electronic device  220 . By using Euler angles, rotation matrices, or the quaternion scheme, a posture value of the first electronic device  210  or the second electronic device  220  may be indicated, and a posture value of a user&#39;s head may be calculated through conversion of a coordinate system. Hereinafter, a posture value calculation operation will be described according to a coordinate system conversion scheme employing the quaternion scheme, but the disclosure is not limited thereto. 
     According to the quaternion scheme, a rotation amount for conversion from an A coordinate system to a B coordinate system (or the A coordinate system expressed based on the B coordinate system) may be expressed by a quaternion formula as in Equation 1. 
         q   A   B =( w,i,j,k )   [Equation 1]
 
     According to certain embodiments, when audio rendering is performed, the processor  331  may perform audio rendering, based on a user&#39;s head movement, or render same, based on both a user&#39;s head movement and a movement of the sound source electronic device  230 . 
     According to an embodiment, when the processor  331  performs audio rendering, based on a user&#39;s head movement, the processor may calculate a posture value q H   N  of a user&#39;s head expressed in an Earth local coordinate system (navigation frame) employing the quaternion scheme. While the first electronic device  210  and/or the second electronic device  220  is worn, the first electronic device  210  and/or the second electronic device  220  are moved together with a user&#39;s head, and thus a relative posture value may be a constant value. The relative posture value is a value determined according to a mechanical characteristic of the first electronic device  210  and/or the second electronic device  220 , may be a relative posture value q H   E  determined through previous measurement based on a normal wearing state, and may be stored in the measurement  332  in advance. 
     The processor  331  may perform a calculation by applying a relative posture value, which is a constant value determined according to a relative posture based on a user&#39;s head and a wearing state of the first electronic device  210  and/or the second electronic device  220 , to a posture value q E   N  (a posture value of the first electronic device  210  and/or the second electronic device  220  expressed in the Earth local coordinate system) transmitted from the first electronic device  210  and/or the second electronic device  220 . The processor  331  may calculate a user&#39;s head posture value q H   N  (a user&#39;s head posture head expressed in the Earth local coordinate system) according to quaternion equation 2 as below by using a posture value q E   N  of the first electronic device  210  and/or the second electronic device  220  expressed in the Earth local coordinate system, and a relative posture value q H   E  stored in the memory  332 . 
         q   H   N   =q   E   N   ·q   H   E    [Equation 2]
 
     According to another embodiment, when the processor  331  performs audio rendering, based on a user&#39;s head movement and a movement of the sound source electronic device  230 , the processor may calculate a posture value q H   S  of a user&#39;s head expressed in a coordinate system for the sound source electronic device  230 , which employs the quaternion scheme. In this case, even when a user&#39;s head moves, a sound image may be changed, and even when the sound source electronic device  230  moves, a sound image may be changed. 
     For example, the processor  331  may obtain a sensor value via an acceleration sensor and/or a gyro sensor of a sensor module (e.g., the sensor module  176  in  FIG. 1 ) of the sound source electronic device  230 , and may calculate a posture value q S   N  (a posture value of the sound source electronic device  230  expressed in the Earth local coordinate system) of the sound source electronic device  230 , based on the sensor value. The processor  331  may calculate a posture value q H   H  of a user&#39;s head expressed in the coordinate system for the sound source electronic device  230  according to quaternion equation 3 as below by using a posture value q S   N  of the sound source electronic device  230 , a posture value q E   N  of the first electronic device  210  or the second electronic device  220 , and a relative posture constant value q H   E  for deriving a user&#39;s head posture value q H   N  therefrom. Here, (q S   N )* corresponds to the conjugate of q S   N . A conjugate is a quaternion rotating opposite to a quaternion, and for example, when q S   N  is expressed by (w, i, j, k), (q S   N )* may be expressed by (w, −i, −j, −k). 
         q   H   S   =q   N   S   ·q   E   N   ·q   H   E =( q   S   N )*· q   E   N   ·q   H   E    [Equation 3]
 
     The processor  331  may load the instructions for executing a head tracking audio solution, which are stored in the memory  332 , and may perform rendering allowing adjustment of, for example, a balance between the left and the right so as to assign spaciousness to a sound to be reproduced, by using an estimated posture value. The processor  331  may allow rendered audio data to be output via the first electronic device  210  and/or the second electronic device  220  so as to provide sound spaciousness to a user, so that the user can experience what it&#39;s like to directly hear a sound from a sound source in a real space. A detailed description thereof will be given with reference to  FIG. 5 . 
     The sensor module  330  may include an acceleration sensor  338  and a gyro sensor  339 . The acceleration sensor  338  and/or the gyro sensor  339  may sense a movement and/or inertia of the sound source electronic device  230 . The acceleration sensor  338  and/or the gyro sensor  339  may include a circuit (e.g., integrated circuit (IC)) for controlling the operation of the acceleration sensor  338  and/or the gyro sensor  339 . For example, the circuit (e.g., integrated circuit (IC)) for controlling the operation of the acceleration sensor  338  and/or the gyro sensor  339  may be included in the sound source electronic device  230 , and may be implemented by the processor  331 . 
     The processor  331  may calculate a posture value, based on a sensor value obtained from the acceleration sensor  338  and/or the gyro sensor  339  of the sensor module  330 . For example, the posture value may be expressed based on yaw, pitch, and roll values. 
     The processor  331  may render audio data, based on a posture value received from the first electronic device  210  or the second electronic device  220  through the first communication link  301  or the third communication link  303 , and a posture value calculated based on a sensor value obtained from the acceleration sensor  338  and/or the gyro sensor  339  of the sensor module  330 , and may transmit the rendered audio data to the first electronic device  210  or the second electronic device  220  through the first communication link  301  or the third communication link  303 . 
     As noted above, determining the posture value can be computationally intense, thereby consuming a large amount of power from the battery  317  or  327 . This can result in more power usage by the electronic device  210  or  220  that performs the primary role, and an imbalance in remaining battery power over time. To increase the amount of time that the electronic devices  210  or  220  can be used, the first electronic device  210  and the second electronic device  220  can swap roles. 
       FIG. 5  is a diagram illustrating an audio rendering operation based on a posture value according to certain embodiments, and shows functional elements of a sound source electronic device (e.g., the sound source electronic device  230  in  FIG. 2  or  FIG. 3 ) and the flow of information. 
     Referring to  FIG. 5 , the sound source electronic device  230  may receive a first posture value  510  (q E   N ) from a first electronic device (e.g., the first electronic device electronic device  210  in  FIG. 2  or  FIG. 3 ) or a second electronic device (e.g., the second electronic device  220  in  FIG. 2  or  FIG. 3 ) by using a Bluetooth communication module  550  (e.g., the communication circuit  333  in  FIG. 3 ). The received posture value  510  may be transmitted to an application  560  via a service module  565 . 
     A sensor module  570  (e.g., the sensor module  330  in  FIG. 3 ) may generate a second posture value  530  (q S   N ) of the sound source electronic device  230 , and the second posture value  530  generated in the sensor module  570  may be transmitted to the application  560  via the service module  565 . The application  560  may be an application which provides, for example, a three-dimensional sound service. 
     The application  560  may generate and transmit a control signal  520  for the sensor module  570  to the service module  565 . The service module  565  may control the sensor module  570 , based on the control signal  520  received from the application  560 . 
     Based on the first posture value  510  and the second posture value  530 , the application  560  may generate, for example, a third posture value  540  (q H   N ), which is a user&#39;s head posture value, by using Equation 2, or generate a third posture value  540  (q H   S ), which is a user&#39;s head posture value based on a coordinate value of the sound source electronic device  230 , by using Equation 3. 
     The application  560  may transmit the generated third posture value  540  to a three-dimensional sound module  590 . The application  560  may transmit an activation control signal  545  to the three-dimensional sound module  590  so as to control activation of a three-dimensional sound service. The activated three-dimensional sound module  590  may render audio data received from a media reproduction module  580 , based on the received third posture value  540 , and transmit the rendered audio data to the Bluetooth communication module  550 . The Bluetooth communication module  550  may transmit rendered audio data  595  to the first electronic device  210  or the second electronic device  220 . 
       FIG. 6A  and  FIG. 6B  are configuration diagrams of electronic devices (e.g., the first electronic device electronic device  210  and the second electronic device  220  in  FIG. 2  or  FIG. 3 ) and a sound source electronic device (e.g., the sound source electronic device  230  in  FIG. 2  or  FIG. 3 ) according to certain embodiments. In  FIG. 6A , the first electronic device  210  is performs the primary role to transmit a posture value. In  FIG. 6B , the second earbud  220  performs the primary role. 
     In  FIG. 6A , When the first electronic device  210  performs the primary role, the first electronic device  210  compares remaining battery capacity thereof with the remaining battery capacity of second electronic device  220 . If the remaining battery capacity of the second electronic device  220  exceeds the remaining battery capacity of the first electronic device  210 , electronic device  210  and the second electronic device  220  exchange roles, such that earbud  220  performs the primary role as shown in  FIG. 6B . 
     Referring to  FIG. 6A  and  FIG. 6B , the first electronic device  210  and the second electronic device  220  may be worn on a user, and may include headphones, earphones, and/or earbuds capable of providing a sound to the user, based on audio data received from the sound source electronic device  230  by using a communication function. Hereinafter, an example in which the first electronic device  210  and the second electronic device  220  are implemented as earbuds, respectively, will be described, but certain embodiments may not be limited thereto. 
     The sound source electronic device  230  may be an portable and/or movable electronic device, such as a smartphone, a tablet PC, a portable multimedia player (PMP), a personal digital assistant (PDA), a laptop PC, and a wearable device. 
     The sound source electronic device  230  may be an electronic device capable of reproducing music or an image, and may provide relevant audio data to the first electronic device electronic device  210  and/or the second electronic device  220 . 
     The first electronic device  210  may perform a primary role to establish communication with the sound source electronic device  230 , and the second electronic device  220  may perform a secondary role to establish communication with the first electronic device electronic device  210 , which is a primary device. 
     Referring to  FIG. 6A , the first electronic device  210  may perform the primary role to be connected to the sound source electronic device  230  through a first communication link  601  by communication. For example, the first electronic device  210  may communicate with the sound source electronic device  230  through the first communication link  601  (e.g., the first network  198  in  FIG. 1 ) including a short-range communication network, such as Bluetooth (or BLE), WiFi direct, or infrared data association (IrDA). 
     The first electronic device electronic device  210  may communicate with the second electronic device  220  by using a second communication link  602  (e.g., a short-range wireless communication network). 
     The first electronic device  210  may calculate a posture value, based on a sensor value obtained by an acceleration sensor (e.g., the acceleration sensor  318  in  FIG. 3 ) and/or a gyro sensor (e.g., the gyro sensor  319  in  FIG. 3 ) of a sensor module (e.g., the sensor module  310  in  FIG. 3 ). For example, the posture value may be expressed based on yaw, pitch, and roll values. 
     The sound source electronic device  230  may render audio data, based on the posture value received from the first electronic device  210 , and may transmit the rendered audio data to the first electronic device  210 . A detailed description of the operation of calculating, by the sound source electronic device  230 , a user&#39;s head posture value or a user&#39;s head posture value relative to a posture value of the sound source electronic device  230 , based on a posture value received from the first electronic device  210 , and rendering audio data, based on the calculated value has been given with reference to  FIG. 3 , and is omitted here. 
     The first electronic device electronic device  210  may communicate with the second electronic device  220  through the second communication link  602 , and may allow the second electronic device  220  to perform sniffing for the first communication link  601  so as to obtain audio data received from the sound source electronic device  230 . The first electronic device electronic device  210  may control the second electronic device  220  through the second communication link  602  such that the received audio data is output together. 
     The first electronic device  210  may identify a battery residual capacity (e.g., a residual power level) of a battery (e.g., the battery  317  in  FIG. 3 ). For example, the first electronic device  210  may identify the battery residual capacity of the battery  317  via a power management circuit (e.g., the power management circuit  316  in  FIG. 3 ). 
     The first electronic device  210  may receive battery residual capacity information of the second electronic device  220  through the second communication link  602  from the second electronic device  220 . 
     The first electronic device  210  may determine primary/secondary role switching, based on device state information thereof. For example, the first electronic device  210  may determine primary/secondary role switching, based on a state of the battery  317  or a state of the sensor module  310 . 
     The first electronic device  210  may determine primary/secondary role switching, based on device state information of the second earbud  220  in addition to device state information of the first electronic device. For example, the first electronic device  210  may determine primary/secondary role switching, based on a state of the battery  317  of the first electronic device and a state of the battery  327  of the second electronic device  220 . 
     The first electronic device  210  may compare the battery residual capacity thereof and the battery residual capacity of the second electronic device  220 , and when the difference therebetween is equal to or greater than a threshold value, determine primary/secondary role switching. 
     The first electronic device  210  may determine primary/secondary role switching when a sensor abnormality occurs in the acceleration sensor  318  and/or the gyro sensor  319  of the sensor module  310  thereof. For example, when a sensor value of the acceleration sensor  318  and/or the gyro sensor  319  is maintained for a predetermined time or longer, or is not output, the first electronic device  210  may identify that a sensor abnormality has occurred. 
     When role switching is determined, the first electronic device  210  may request, through the second communication link  602 , the second electronic device  220  to perform a role switching preparation. 
     According to the requesting of, by the first electronic device  210 , the role switching preparation, the second electronic device  220  may perform relevant operations for performing a primary role rather than a secondary role. For example, the second electronic device  220  may activate an acceleration sensor (e.g., the acceleration sensor  328  in  FIG. 3 ) and/or a gyro sensor (e.g., the gyro sensor  329  in  FIG. 3 ) of a sensor module (e.g., the sensor module  320  in  FIG. 3 ) and obtain a sensor value. For example, the second electronic device  220  may calculate a posture value, based on a sensor value obtained via the sensor module  320 . 
     The second electronic device  220  may start to perform the primary role after passage of a designated time from starting a posture value calculation operation, or when a role switching message is received from the first electronic device  210 . 
     The first electronic device  210  may notify the sound source electronic device  230  that role switching is performed, after passage of a designated time, or when the second electronic device  220  performs role switching preparation. The first electronic device  210  may transmit a role switching message to the second electronic device  220  to perform role conversion, and may switch to the role of a secondary device. 
     Referring to  FIG. 6B , the second electronic device  220  may, according to performing role switching, establish or connect a third communication link  603  (e.g., the first network  198  in  FIG. 1 ) with the sound source electronic device  230  so as to perform communication. For example, the third communication link  603  may be switched from an idle state to a connected state, or may be newly established. 
     The second electronic device  220  may communicate with the sound source electronic device  230  through the third communication link  603  as a primary device, to transmit a calculated posture value, and receive audio data rendered based on the posture value from the sound source electronic device  230 . 
     The sound source electronic device  230  may communicate with the second electronic device  220  through the third communication link  603 , to receive a posture value of the second electronic device  220 , and render audio data based on the posture value. 
     According to an embodiment, in a case where a processor (e.g., the processor  331  in  FIG. 3 ) of the sound source electronic device  230  performs audio rendering, based on a posture value of the second electronic device  220  according to role switching while performing audio rendering, based on a posture value of the first electronic device  210 , a posture value calculation scheme may be changed. For example, an equation for calculating a user&#39;s head posture value q H   N , based on a posture value of a left unit or a right unit of earbuds may be calculated with reference to Equation 2, according to quaternion equation 4 as below by applying a relative posture value q H   L  between the left unit and the user&#39;s head with respect to a left unit posture value q L   N , or applying a relative posture value q H   R  between the right unit and the user&#39;s head with respect to a right unit posture value q R   H . 
         q   H   N   =q   R   N   ·q   H   R   =q   L   N   ·q   H   L    [Equation 4]
 
     The relative posture value q H   L  between the left unit and the user&#39;s head, and the relative posture value q H   R  between the right unit and the user&#39;s head is a value determined according to a mechanical characteristic of the first electronic device  210  and/or the second electronic device  220 , and may be stored in advance in a memory (e.g., the memory  332  in  FIG. 3 ) through previous measurement based on a normal wearing state. 
     Referring to Equation 4, according to primary role switching from the left unit to the right unit or from the right unit to the left unit, different relative posture values may be applied to calculate a user&#39;s head posture value. In this case, the left unit and the right unit start to measure posture values at different time points, and thus reference coordinates for calculating azimuths of the left unit and the right unit are different. Therefore, absolute azimuths thereof may not coincide with each other. Therefore, the processor  331  of the sound source electronic device  230  may perform operation as follows so that rendered sound images are not twisted and are smoothly connected even when the applied relative posture value is changed at a particular time point. 
     The processor  331  of the sound source electronic device  230  may, for example, when role switching between a left unit and a right unit of earbuds occurs, calculate a changed current posture value by calculating an azimuth change amount of the switched unit, and adding same to an output azimuth. 
     For example, when the azimuths of a user head estimated according to the postures of the left unit and the right unit are Yaw L  and Yaw R , respectively, the processor  331  may calculate Yaw output , which is an azimuth value for audio rendering, according to Equation 5 as below. 
     
       
         
           
             
               
                 
                   
                       
                   
                   ⁢ 
                   
                     
                       
                         Yaw 
                         
                           output 
                           , 
                           0 
                         
                       
                       = 
                       0 
                     
                     ⁢ 
                     
                       
 
                     
                     ⁢ 
                     
                       
                         Yaw 
                         
                           output 
                           , 
                           
                             t 
                             ⁡ 
                             
                               ( 
                               
                                 &gt; 
                                 0 
                               
                               ) 
                             
                           
                         
                       
                       = 
                       
                         
                           
                             
                               
                                 
                                   Yaw 
                                   
                                     output 
                                     , 
                                     
                                       t 
                                       - 
                                       1 
                                     
                                   
                                 
                                 + 
                                 
                                   ( 
                                   
                                     
                                       Yaw 
                                       
                                         L 
                                         , 
                                         t 
                                       
                                     
                                     - 
                                     
                                       Yaw 
                                       
                                         L 
                                         , 
                                         
                                           t 
                                           - 
                                           1 
                                         
                                       
                                     
                                   
                                   ) 
                                 
                               
                               , 
                             
                           
                           
                             
                               L 
                               : 
                               primary 
                             
                           
                         
                         
                           
                             
                               
                                 
                                   Yaw 
                                   
                                     output 
                                     , 
                                     
                                       t 
                                       - 
                                       1 
                                     
                                   
                                 
                                 + 
                                 
                                   ( 
                                   
                                     
                                       Yaw 
                                       
                                         R 
                                         , 
                                         t 
                                       
                                     
                                     - 
                                     
                                       Yaw 
                                       
                                         R 
                                         , 
                                         
                                           t 
                                           - 
                                           1 
                                         
                                       
                                     
                                   
                                   ) 
                                 
                               
                               , 
                             
                           
                           
                             otherwise 
                           
                         
                       
                     
                   
                 
               
               
                 
                   [ 
                   
                     Equation 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     5 
                   
                   ] 
                 
               
             
           
         
       
     
     Therefore, an azimuth output value reflects an azimuth change amount at a corresponding time point with respect to a previous azimuth output value rather than the azimuths estimated by the left and right units. Therefore, even when two different azimuths having different reference time points are used, an output value Yaw output  may indicate a continuously accumulated azimuth change amount. Accordingly, when audio rendering is performed based on the output value, rendered sound images can be smoothly connected without being twisted in spite of role switching. 
     The first electronic device  210  may switch the first communication link  601  with the sound source electronic device  230  to be in an idle state, or may disconnect same. For example, the first electronic device  210  having switched to the role of a secondary device may switch the first communication link  201  with the sound source electronic device  230  to be in an idle state and/or a non-connected state. 
     The first electronic device  210  may communicate with the second electronic device  220  through the second communication link  602  as a secondary device, and perform sniffing for the third communication link  603  between the second electronic device  220  and the sound source electronic device  230  to obtain audio data transmitted from the sound source electronic device  230  to the second electronic device  220 . For example, the first electronic device  210  may deactivate at least a part of the sensor module  310 , or may switch same into a power save mode. For example, the first electronic device  210  may deactivate the gyro sensor  319 , or may switch same into a power save mode. 
     According to another embodiment, when the first electronic device  210  obtains a sensor value and performs a posture value calculation operation based on the sensor value, the first electronic device may allow the second electronic device  220  to perform the posture value calculation operation via role switching with the second electronic device  220 , and operate, in communication, as a primary device communicating with the sound source electronic device  230  while maintaining a state connected to the first communication link  601 . For example, in a case where the battery residual capacity of the first electronic device  210  is high, but an abnormality of a sensor has occurred, the second electronic device  220  may be allowed to obtain a sensor value and perform a posture value calculation operation based on the sensor value. 
     An electronic device (e.g., the first electronic device  210  in  FIG. 3 ) according to an embodiment may include a memory (e.g., the memory  312  in  FIG. 3 ), a battery (e.g., the battery  317  in  FIG. 3 ), a speaker (e.g., the speaker  315  in  FIG. 3 ), a sensor module (e.g., the sensor module  310  in  FIG. 3 ), a communication module (e.g., the communication circuit  313  in  FIG. 3 ), and a processor (e.g., the processor  311  in  FIG. 3 ) electrically connected to the memory  312 , the battery  317 , the speaker  315 , the sensor module  310 , and the communication module  313 , wherein the processor  311  is configured to control the communication module  313  to establish a first communication link (e.g., the first communication link  201 ,  301 , or  601  in  FIG. 2 ,  FIG. 3 , or  FIG. 6A ) with a sound source electronic device (e.g., the sound source electronic device  230  in  FIG. 3 ) and transmit a first posture value calculated based on a sensor value obtained from the sensor module  310  over the first communication link, receive audio data rendered based on the posture value from the sound source electronic device  230 , communicate, based on device state information of the electronic device  210 , with an external electronic device (e.g., the second electronic device  220  in  FIG. 3 ) through a second communication link (e.g., the second communication link  202 ,  302 , or  602  in  FIG. 2 ,  FIG. 3 ,  FIG. 6A , or  FIG. 6B ) so as to request a role switching preparation, and transmit a role switching message to the external electronic device  220  and notify the sound source electronic device  230  of role switching with the external electronic device  220 . 
     According to an embodiment, the processor  311  may be configured to receive battery residual capacity information of the external electronic device  220  through the second communication link  202 ,  302 , or  602 , and determine a difference between a residual capacity of the external electronic device with a residual capacity of the battery  317 , and wherein request the role switching preparation is in response to the difference being greater than a designated threshold value. 
     According to an embodiment, the processor  311  may be configured to, when a designated time has passed after the requesting of the role switching preparation, transmit a role switching message to the external electronic device  220 . 
     According to an embodiment, the processor  311  may be configured to receive a posture value from the external electronic device, monitor a change amount, and wherein transmit the role switching message comprises transmitting the role switching message when a difference between the change amount and a change amount of the posture value calculated by the processor  311  is equal to or smaller than a designated threshold value. 
     According to an embodiment, the processor  311  may be configured to, after notifying the sound source electronic device  230  of the role switching, control the communication module to release the first communication link  201 ,  301 , or  601  with the sound source electronic device  230 . 
     According to an embodiment, the processor  311  may be configured to, after notifying the sound source electronic device  230  of the role switching, control the communication module to at least partially deactivate the sensor module  313 . 
     According to an embodiment, the processor  311  may be configured to, receive a second posture value from the external electronic device over the second communication link and transmit the second posture value received from the external electronic device  220  to the sound source electronic device  230  over the first communication link, and receive audio data rendered based on the posture value of the external electronic device  220 . 
     According to an embodiment, the processor  311  may be configured to, after receiving a response to the request, the response indicating that role switching is possible from the external electronic device  220 , transmit the role switching message to the external electronic device  220 . 
     According to an embodiment, an electronic device (e.g., the sound source electronic device  230  in  FIG. 2  or  FIG. 3 ) may include a memory (e.g., the memory  332  in  FIG. 3 ), a communication module (e.g., the communication module  333  in  FIG. 3 ), and a processor (e.g., the processor  331  in  FIG. 3 ) electrically connected to the memory  332  and the communication module  333 , wherein the processor  331  is configured to control the communication module  333  to establish a first communication link (e.g., the first communication link  201 ,  301 , or  601  in  FIG. 2 ,  FIG. 3 , or  FIG. 6A ) with a first electronic device (e.g., the first electronic device  210  in  FIG. 2  or  FIG. 3 ) and receive a posture value of the first electronic device  210  that performs a primary role, transmit audio data rendered based on the posture value to the first electronic device  210 , receive a posture value of a second electronic device  220  when role switching with the second electronic device  220  connected to the first electronic device  210  through a second communication link (e.g., the second communication link  202 ,  302 , or  602  in  FIG. 2 ,  FIG. 3 ,  FIG. 6A , or  FIG. 6B ) is notified of by the first electronic device  210 , and transmit audio data rendered based on the posture value of the second electronic device  220  to at least one of the first electronic device  210  or the second electronic device  220 . 
     The processor  331  may configured to render the audio data, based on a posture value output by accumulating and summing an azimuth change amount of the posture value of the second electronic device  220  with respect to an azimuth change amount of the posture value of the first electronic device  210 , and transmit the rendered audio data to at least one of the first electronic device or the second electronic device. 
     According to an embodiment, each of the first electronic device  210  and the second electronic device  220  may include a left or right earbud, and the processor  331  may be configured to calculate a user&#39;s head posture value, based on a posture value of the left earbud or a posture value of the right earbud, and render the audio data, based on the user&#39;s head posture value. 
     The electronic device may further include a sensor module (e.g., the sensor module  330  in  FIG. 3 ), wherein the processor  331  is configured to calculate a posture value of the electronic device  230  according to a sensor value received from the sensor module  330 , and based on the posture value of the electronic device  230 , convert the posture value received from the first electronic device  210  or the second electronic device  220  into a user&#39;s head posture value to render the audio data. 
       FIG. 7  is a flowchart illustrating a role switching method for a first electronic device (e.g., the first electronic device  210  in  FIG. 2  or  FIG. 3 ) according to certain embodiments. 
     The first electronic device  210  and a second electronic device (e.g., the second electronic device  220  in  FIG. 2  or  FIG. 3 ) may be worn on a user, and may include headphones, earphones, and/or earbuds capable of providing a sound to the user, based on audio data received from a sound source electronic device (e.g., the sound source electronic device  230  in  FIG. 2  or  FIG. 3 ) by using a communication function. Hereinafter, an example in which the first electronic device  210  and the second electronic device  220  are implemented as earbuds, respectively, will be described, but certain embodiments may not be limited thereto. 
     The first electronic device  210  may operate as a primary device, the second electronic device  220  may operate as a secondary device, and when role switching is determined, the first electronic device  210  may switch to the role of a secondary device, and the second electronic device  220  may switch to the role of a primary device. 
     The sound source electronic device  230  may be an portable and/or movable electronic device, such as a smartphone, a tablet PC, a portable multimedia player (PMP), a personal digital assistant (PDA), a laptop PC, and a wearable device. 
     The sound source electronic device  230  may be an electronic device capable of reproducing music or an image, and may provide relevant audio data to the first electronic device  210  and/or the second electronic device  220 . 
     According to an embodiment, a processor (e.g., the processor  311  in  FIG. 3 ) of the first electronic device  210  may establish communication with the sound source electronic device  230  via a communication circuit (e.g., the communication circuit  313  in  FIG. 3 ) so as to enable the first electronic device  201  to perform a primary role. 
     The processor  311  of the first electronic device  210  may, in operation  701 , calculate a posture value of the first electronic device  210 , based on a sensor value obtained via an acceleration sensor (e.g., the acceleration sensor  318  in  FIG. 3 ) and/or a gyro sensor (e.g., the gyro sensor  319  in  FIG. 3 ) of a sensor module (e.g., the sensor module  310  in  FIG. 3 ), and transmit the calculated posture value to the sound source electronic device  230 . 
     The first electronic device  210  may calculate the posture value, based on the sensor value obtained by the acceleration sensor  318  and/or the gyro sensor  319  of the sensor module  310 . For example, the posture value may be expressed based on yaw, pitch, and roll values. 
     The first electronic device  210  may perform the primary role to transmit or receive a signal to or from the sound source electronic device  230  through a first communication link (e.g., the first communication link  201 ,  301 , or  601  in  FIG. 2 ,  FIG. 3 , or  FIG. 6A ). For example, the first communication link  201 ,  301 , or  601  may include a short-range communication network, such as Bluetooth (or BLE), WiFi direct, or infrared data association (IrDA). 
     According to certain embodiments, in operation  703 , the processor  311  of the first electronic device  210  may receive, from the sound source electronic device  230 , audio data rendered based on the posture value received from the first electronic device  210 . 
     The first electronic device  210  may communicate with the second electronic device  220  by using a second communication link (e.g., the second communication link  202 ,  302 , or  602  in  FIG. 2 ,  FIG. 3 ,  FIG. 6A , or  FIG. 6B ) (e.g., a short-range wireless communication network). For example, the second electronic device  220  may perform the secondary role to establish communication with the first electronic device  210 , which is a primary device, through the second communication link  202 ,  302 , or  302 . 
     The processor  311  of the first electronic device  210  may communicate with the second electronic device  220  through the second communication link  602 , and may allow the second electronic device  220  to sniff and obtain audio data received from the sound source electronic device  230 . The first electronic device  210  may control the second electronic device  220  through the second communication link  202 ,  302 , or  602  such that the received audio data is output together. 
     The processor  311  of the first electronic device  210  may, in operation  705 , determine role switching according to device state information, and request the second electronic device  220  to perform a role switching preparation. 
     The processor  311  may determine the battery residual capacity of a battery (e.g., the battery  317  in  FIG. 3 ), and determine role switching, based on same. For example, the processor  311  may determine role switching through a comparison between the battery residual capacity of the first electronic device  210  and the battery residual capacity of the second electronic device  220 . For example, the processor  311  of the first electronic device  210  may identify the battery residual capacity of the battery  317  via a power management processor circuit (e.g., the power management circuit  316  in  FIG. 3 ). For example, the processor  311  of the first electronic device  210  may receive battery residual capacity information of the second electronic device  220  through the second communication link  202 ,  302 ,  602  from the second electronic device  220 . The processor  311  of the first electronic device  210  may compare the battery residual capacity thereof and the battery residual capacity of the second electronic device  220 , and when the difference therebetween is equal to or greater than a threshold value, determine primary/secondary role switching. 
     The processor  311  of the first electronic device  210  may determine primary/secondary role switching when a sensor abnormality occurs in the acceleration sensor  318  and/or the gyro sensor  319  of the sensor module  310  thereof. For example, when a sensor value of the acceleration sensor  318  and/or the gyro sensor  319  is maintained for a predetermined time or longer, or is not output, the processor  311  may identify that a sensor abnormality has occurred. 
     According to an embodiment, when role switching is determined, the processor  311  of the first electronic device  210  may request, through the second communication link  202 ,  302 , or  602 , the second electronic device  220  to perform a role switching preparation. 
     According to certain embodiments, in order for the second electronic device  220  to perform relevant operations for the primary role according to the role switching preparation request, the processor (e.g., the processor  321  in  FIG. 3 ) may activate an acceleration sensor (e.g., the acceleration sensor  328  in  FIG. 3 ) and/or a gyro sensor (e.g., the gyro sensor  329  in  FIG. 3 ) of a sensor module (e.g., the sensor module  320  in  FIG. 3 ) and obtain a sensor value. The processor  321  of the second electronic device  220  may calculate a posture value, based on a sensor value obtained via the sensor module  320 . 
     The processor  311  of the first electronic device  210  may, in operation  707 , transmit a role switching message to the second electronic device  220 . 
     The processor  311  of the first electronic device  210  may transmit the role switching message to the second electronic device  220  after passage of a designated time so as to allow the role switching so that the processor  321  of the second electronic device  220  can be stabilized through initiation of operation of the sensor module  320  and a subsequent posture value calculation according to the role switching preparation request. 
     According to an embodiment, the processor  311  of the first electronic device  210  may receive a posture value calculated by the second electronic device  220  according to the role switching preparation request, and the first electronic device  210  may, based on the posture value, monitor change amounts of the posture value of the first electronic device  210  and the posture value of the second electronic device  220 , and when the difference between the change amounts is smaller than a threshold value, determine that role switching is possible, and transmit a role switching message to the second electronic device  220 . 
     According to an embodiment, the processor  321  of the second electronic device  220  may receive a posture value of the first electronic device  210  from the first electronic device  210  according to initiation of operation of the sensor module  320  and a subsequent posture value calculation, and monitor change amounts of the posture value of the first electronic device  210  and the posture value of the second electronic device  220 . When the difference between the change amounts is smaller than a threshold value, transmit, to the first electronic device  210 , the processor of the second electronic device may transmit a response indicating that role switching is possible, and the processor  331  of the first electronic device  210  may transmit a role switching message to the second electronic device  220 , based on the response. 
     The processor  311  of the first electronic device  210  may allow the second electronic device  220  to transmit, to the sound source electronic device  230 , a posture value calculated according to initiation of operation of the sensor module  320  and a subsequent posture value calculation, and the sound source electronic device  230  may monitor change amounts of the posture value of the first electronic device  210  and the posture value of the second electronic device  220 , and when the difference between the change amounts is smaller than a threshold value, determine that role switching is possible, and allow transmission of a role switching message to the first electronic device  210  and/or the second electronic device  220 . 
     According to certain embodiments, when a response to the role switching request is received from the second electronic device  220 , the processor  311  of the first electronic device  210  may, in operation  709 , notify the sound source electronic device  230  that role switching is performed. According to an embodiment, the processor  311  of the first electronic device  210  may control the second electronic device  220  to perform role switching to a primary device by, for example, transmitting a control signal. 
     The second electronic device  220  may, according to performing role switching, establish or connect a third communication link (e.g., the third communication link  203 ,  303 , or  603  in  FIG. 2 ,  FIG. 3 , or  FIG. 6 b   ) (e.g., the first network  198  in  FIG. 1 ) with the sound source electronic device  230  so as to perform communication. For example, the third communication link  203 ,  303 , or  603  may be switched from an idle state to a connected state, or may be newly established. 
     The second electronic device  220  may communicate with the sound source electronic device  230  through the third communication link  603  as a primary device, to transmit a calculated posture value, and receive audio data rendered based on the posture value from the sound source electronic device  230 . 
     The processor  311  of the first electronic device  210  may switch the first communication link  201 ,  301 , or  601  with the sound source electronic device  230  to be in an idle state, or may disconnect same. For example, the first electronic device  210  having switched to the role of a secondary device may switch the first communication link  201  with the sound source electronic device  230  to be in an idle state and/or a non-connected state. 
     The processor  311  of the first electronic device  210  may communicate with the second electronic device  220  through the second communication link  602  as a secondary device, and perform sniffing for the third communication link  203 ,  303 , or  603  between the second electronic device  220  and the sound source electronic device  230  to obtain audio data transmitted from the sound source electronic device  230  to the second electronic device  220 . 
     The processor  311  of the first electronic device  210  may deactivate at least a part of the sensor module  310 , or may switch same into a power save mode. For example, the first electronic device  210  may deactivate the gyro sensor  319 , or may switch same into a power save mode. 
       FIG. 8  is a flowchart illustrating a role switching method for a second electronic device (e.g., the second electronic device  220  in  FIG. 2  or  FIG. 3 ) of electronic devices according to certain embodiments. 
     According to certain embodiments, a first electronic device (e.g., the first electronic device  210  in  FIG. 2  or  FIG. 3 ) and the second electronic device  220  may be worn on a user, and may include headphones, earphones, and/or earbuds capable of providing a sound to the user, based on audio data received from a sound source electronic device (e.g., the sound source electronic device  230  in  FIG. 1  or  FIG. 3 ) by using a communication function. Hereinafter, an example in which the first electronic device  210  and the second electronic device  220  are implemented as earbuds, respectively, will be described, but certain embodiments may not be limited thereto. 
     The first electronic device  210  may operate as a primary device, the second electronic device  220  may operate as a secondary device, and when role switching is determined, the first electronic device  210  may switch to the role of a secondary device, and the second electronic device  220  may switch to the role of a primary device. 
     The sound source electronic device  230  may be an portable and/or movable electronic device, such as a smartphone, a tablet PC, a portable multimedia player (PMP), a personal digital assistant (PDA), a laptop PC, and a wearable device. 
     The sound source electronic device  230  may be an electronic device capable of reproducing music or an image, and may provide relevant audio data to the first electronic device  210  and/or the second electronic device  220 . 
     According to an embodiment, a processor (e.g., the processor  321  in  FIG. 3 ) of the second electronic device  220  may communicate, via a communication circuit (e.g., the communication circuit  323  in  FIG. 3 ), with the first electronic device  210  which establishes communication with the sound source electronic device  230  and communicates with same. For example, the processor  321  of the second electronic device  220  may communicate with the first electronic device  210  through a second communication link (e.g., the second communication link  202 ,  302 , or  602  in  FIG. 2 ,  FIG. 3 ,  FIG. 6A  or  FIG. 6B ), and sniff and obtain audio data received by the first electronic device  210  through a first communication link (e.g., the first communication link  201 ,  301 , or  601  in  FIG. 2 ,  FIG. 3 , or  FIG. 6A ) from the sound source electronic device  230 . 
     The processor  321  of the second electronic device  220  may, in operation  801 , receive, for example, through sniffing, audio data transmitted from the sound source electronic device  230  to the first electronic device  210 . The processor  321  of the second electronic device  220  may output the received audio data together under a control of the first electronic device  210 . 
     According to certain embodiments, in operation  803 , the processor  321  of the second electronic device  220  may activate, according to reception of a role switching preparation request from the first electronic device  210 , an acceleration sensor (e.g., the acceleration sensor  328  in  FIG. 3 ) and/or a gyro sensor (e.g., the gyro sensor  329  in  FIG. 3 ) of a sensor module (e.g., the sensor module  320  in  FIG. 3 ), obtain a sensor value, and calculate a posture value of the second electronic device  220 , based on the sensor value. 
     The processor  321  of the second electronic device  220  may, in operation  805 , receive a role switching message according to initiation of operation of the sensor module  320  and a subsequent posture value calculation. For example, the processor  321  of the second electronic device  220  may transmit, to the first electronic device  210 , a posture value calculated according to initiation of operation of the sensor module  320  and a subsequent posture value calculation, and the first electronic device  210  may monitor, based on the posture value, change amounts of the posture value of the first electronic device  210  and the posture value of the second electronic device  220 , and when the difference between the change amounts is smaller than a threshold value, determine that role switching is possible, and transmit a role switching message to the second electronic device  220 . For example, the processor  321  of the second electronic device  220  may a response indicating that role switching is possible, to the first electronic device  210 , according to initiation of operation of the sensor module  320  and a subsequent posture value calculation, and the first electronic device  210  may transmit, based on the response, a role switching message to the second electronic device  220 . 
     According to another embodiment, the processor  321  of the second electronic device  220  may transmit, to the sound source electronic device  230 , a posture value calculated according to initiation of operation of the sensor module  320  and a subsequent posture value calculation, and the sound source electronic device  230  may monitor change amounts of the posture value of the first electronic device  210  and the posture value of the second electronic device  220 , and when the difference between the change amounts is smaller than a threshold value, determine that role switching is possible, and transmit a role switching message to the second electronic device  220  and/or the first electronic device  210 . 
     According to various embodiments, the processor  321  of the first electronic device  210  may, in operation  807 , establish communication with the sound source electronic device  230  as a primary device. For example, the processor  321  of the second electronic device  220  may, according to performing role switching, establish or connect a third communication link (e.g., the third communication link  203 ,  303 , or  603  in  FIG. 2 ,  FIG. 3 , or  FIG. 6B ) (e.g., the first network  198  in  FIG. 1 ) with the sound source electronic device  230  so as to perform communication. For example, the third communication link  203 ,  303 , or  603  may be switched from an idle state to a connected state, or may be newly established. 
     The processor  321  of the second electronic device  220  may, in operation  809 , communicate with the sound source electronic device  230  through the third communication link  603 , to transmit a calculated posture value thereto, and may, in operation  811 , receive audio data rendered based on the posture value from the sound source electronic device  230 . 
     The audio data received from the sound source electronic device  230  may be audio data, which is rendered based on the posture value of the second electronic device  220 , and to which an azimuth output by accumulating azimuth change amounts, as described with reference to Equation 5, with respect to the posture value of the first electronic device  210  before role switching. 
     The first electronic device  210  may, according to switching to the role of a secondary device, switch the first communication link  201 ,  301 , or  601  with the sound source electronic device  230  to be in an idle state, or disconnect same. For example, the first electronic device  210  having switched to the role of a secondary device may switch the first communication link  201  with the sound source electronic device  230  to be in an idle state and/or a non-connected state. 
     The first electronic device  210  may communicate with the second electronic device  220  through the second communication link  602  as a secondary device, and perform sniffing for the third communication link  203 ,  303 , or  603  between the second electronic device  220  and the sound source electronic device  230  to obtain audio data transmitted from the sound source electronic device  230  to the second electronic device  220 . 
     According to an embodiment, when the first electronic device  210  obtains a sensor value and performs a posture value calculation operation based on the sensor value, the first electronic device may allow the second electronic device  220  to perform the posture value calculation operation via role switching with the second electronic device  220 , and operate, in communication, as a primary device communicating with the sound source electronic device  230  while maintaining a state connected to the first communication link  201 ,  301 , or  601 . For example, in a case where the battery residual capacity of the first electronic device  210  is high, but an abnormality of a sensor has occurred, the second electronic device  220  may be allowed to obtain a sensor value and perform a posture value calculation operation based on the sensor value. 
     According to certain embodiments, a method for an electronic device comprising a sensor module, comprises: establishing a first communication link with a sound source electronic device and transmitting to the sound source electronic device, a first posture value calculated based on a sensor value obtained from the sensor module; receiving audio data rendered based on the posture value from the sound source electronic device; communicating, based on device state information, with an external electronic device, through a second communication link so as to request a role switching preparation; transmitting a role switching message to the external electronic device; notifying the sound source electronic device of role switching with the external electronic device; and transmitting the first posture value to the external electronic device after role switching. 
     According to certain embodiments, the method further comprises receiving battery residual capacity information of the external electronic device through the second communication link; and determine a difference between the residual capacity of the external electronic device with a residual capacity of a battery of the electronic device, and wherein the request for the role switching preparation is in response to the difference being equal to or greater than a designated threshold value. 
     According to certain embodiments, transmitting of the role switching message to the external electronic device is performed is performed when a designated time after the requesting of the role switching preparation has passed. 
     According to certain embodiments, the method further comprises receiving a posture value from the external electronic device, and monitoring a change amount, and wherein transmitting the role switching message comprises transmitting the role switching message and when a difference between the change amount of the posture value of the external electronic device and a change amount of the posture value of the electronic device is equal to or smaller than a designated threshold value. 
     According to certain embodiments, after the notifying of the role switching, releasing the first communication link with the sound source electronic device. 
     According to certain embodiments, the method further comprises, after the notifying of the role switching, at least partially deactivating the sensor module. 
     According to certain embodiments, the method further comprises: receive a second posture value from the external electronic device over the second communication link and, transmitting the second posture value received from the external electronic device to the sound source electronic device over the first communication link; and receiving, from the sound source electronic device, audio data rendered based on the posture value of the external electronic device. 
     According to certain embodiments, transmitting the role switching message is performed when a response indicating that role switching is possible is received from the external electronic device according to initiation of a posture value calculation operation. 
     The embodiments disclosed herein are merely presented to easily describe technical content and help the understanding of same and are not intended to limit the technical scope disclosed therein. Therefore, the technical scope disclosed therein should be construed to include, in addition to the embodiments disclosed herein, all changes and modifications that are derived based on the technical idea of certain embodiments disclosed herein.