Wireless audio reception device and wireless audio output system having same

Abstract

The present disclosure relates to a wireless audio reception device and a wireless audio output system having same. A wireless audio reception device according to an embodiment of the present disclosure comprises: a first reception device for receiving an audio signal of a first channel from a wireless audio transmission device; and a second reception device for receiving an audio signal of a second channel from the wireless audio transmission device, wherein the first reception device transmits first microphone-based first packet data to the wireless audio transmission device through a call link to the wireless audio transmission device, and when microphone path switching is required, the first reception device transmits a microphone path switching request message to the second reception device, and stops transmission of the first microphone-based first packet data while maintaining a data link, and the second reception device transmits second microphone-based second packet data to the wireless audio transmission device when the microphone path switching request message is received. Accordingly, delay and packet loss due to microphone switching in a plurality of wireless reception devices can be reduced.

Description

Wireless audio receiving device and wireless audio output system having the same

[0001] The present disclosure relates to a wireless audio receiving device and a wireless audio output system having the same, and more particularly, to a wireless audio receiving device capable of reducing delay and packet loss due to microphone switching in a plurality of wireless receiving devices, and a wireless audio output system having the same.

[0002] A wireless audio transmitting device wirelessly transmits audio signals to an external wireless audio receiving device.

[0003] In response to this, the wireless audio receiving device wirelessly receives an audio signal from an external wireless audio transmitting device, converts the received audio signal into sound, and outputs it.

[0004] Meanwhile, if the wireless audio receiving device is an earbud, the left and right receiving devices convert the received audio signal into sound and output it.

[0005] Meanwhile, when the wireless earbuds are operating in call mode, among the master receiving device and the slave receiving device, the master receiving device can maintain the call link.

[0006] Prior art document 1, U.S. Patent Publication No. US2020 / 0252993, discloses performing a role handover from a master receiver to a slave receiver by a fast role switch method between wireless earbuds.

[0007] However, according to the method of prior art document 1, since a fast role switch must be performed, transmission packet loss occurs and seamless path switching is difficult, which is a disadvantage.

[0008] Prior art document 2, U.S. Patent Publication No. US10425737, discloses a method in which the responsibility for packet transmission is changed from a master receiving device to a slave receiving device by a role change method between wireless earbuds.

[0009] However, according to the method of prior art 2, since a roll change must be performed, transmission packet loss occurs and seamless path switching is difficult, which is a disadvantage.

[0010] The problem of the present disclosure is to provide a wireless audio receiving device capable of reducing delay and packet loss due to microphone switching in a plurality of wireless receiving devices, and a wireless audio output system including the same.

[0011] Another object of the present disclosure is to provide a wireless audio receiving device capable of seamlessly performing packet transmission by microphone switching in a plurality of wireless receiving devices, and a wireless audio output system including the same.

[0012] Another problem of the present disclosure is to provide a wireless audio receiving device capable of stably establishing or maintaining a call link in a plurality of wireless receiving devices, and a wireless audio output system having the same.

[0013] In order to achieve the above-described problem, according to one embodiment of the present disclosure, a wireless audio receiving device and a wireless audio output system including the same include a first receiving device that receives an audio signal of a first channel from a wireless audio transmitting device, and a second receiving device that receives an audio signal of a second channel from the wireless audio transmitting device, wherein the first receiving device transmits first packet data based on a first microphone to the wireless audio transmitting device through a call link with the wireless audio transmitting device, and when a microphone path switching is required, transmits a microphone path switching request message to the second receiving device, and stops transmitting the first packet data based on the first microphone while maintaining the data link, and the second receiving device transmits second packet data based on a second microphone to the wireless audio transmitting device when receiving the microphone path switching request message.

[0014] Meanwhile, when the second receiving device receives a microphone pass switching request message, it can transmit an acknowledgement message from the first receiving device and transmit second packet data based on the second microphone to the wireless audio transmitting device.

[0015] Meanwhile, the second receiving device, when receiving a microphone pass switching request message, can transmit second packet data based on the second microphone to the wireless audio transmitting device through the second call link.

[0016] Meanwhile, the first receiving device transmits the first packet data based on the first microphone to the wireless audio transmitting device through a call link, and when a microphone path switching is required, transmits a microphone path switching request message to the second receiving device, and when receiving an acknowledgement message from the second receiving device, stops transmitting the first packet data based on the first microphone while maintaining the data link.

[0017] Meanwhile, the first receiving device can establish or maintain a call link when a call link is required while maintaining a data link with the wireless audio transmitting device.

[0018] Meanwhile, the second receiving device can transmit second microphone-based second packet data to the wireless audio transmitting device through the second call link when receiving a microphone pass switching request message while the wireless audio transmitting device and the first receiving device maintain a data link.

[0019] Meanwhile, the second receiving device may transmit a microphone path switching required message to the first receiving device when the first receiving device is transmitting the first packet data based on the first microphone to the wireless audio transmitting device through a call link with the wireless audio transmitting device, if a microphone path switching is required.

[0020] Meanwhile, when the first receiving device receives a microphone path switching required message from the second receiving device, the first receiving device transmits a microphone path switching request message to the second receiving device and stops transmitting the first packet data based on the first microphone while maintaining the data link, and when the second receiving device receives the microphone path switching request message, the second packet data based on the second microphone can be transmitted to the wireless audio transmission device.

[0021] Meanwhile, when the second receiving device receives a microphone pass switching request message, it can transmit an acknowledgement message from the first receiving device and transmit second packet data based on the second microphone to the wireless audio transmitting device.

[0022] Meanwhile, the second receiving device, when receiving a microphone pass switching request message, can transmit second packet data based on the second microphone to the wireless audio transmitting device through the second call link.

[0023] Meanwhile, if the first receiving device receives an acknowledgement message from the second receiving device after transmitting a microphone pass switching request message to the second receiving device, the first receiving device can stop transmitting the first packet data based on the first microphone while maintaining the data link.

[0024] Meanwhile, the first receiving device can establish or maintain a call link when a call link is required while maintaining a data link with the wireless audio transmitting device.

[0025] Meanwhile, the second receiving device can transmit second microphone-based second packet data to the wireless audio transmitting device through the second call link when receiving a microphone pass switching request message while the wireless audio transmitting device and the first receiving device maintain a data link.

[0026] According to another embodiment of the present disclosure, a wireless audio receiving device and a wireless audio output system including the same include a first receiving device that receives an audio signal of a first channel from a wireless audio transmitting device, and a second receiving device that receives an audio signal of a second channel from the wireless audio transmitting device, wherein the second receiving device transmits a microphone path switching required message to the first receiving device when the first receiving device transmits first packet data based on a first microphone to the wireless audio transmitting device through a call link with the wireless audio transmitting device, and when a microphone path switching request message is received from the first receiving device, transmits second packet data based on a second microphone to the wireless audio transmitting device.

[0027] Meanwhile, when the first receiving device receives a microphone pass switching required message from the second receiving device, the first receiving device can transmit a microphone pass switching request message to the second receiving device and stop transmission of the first packet data based on the first microphone while maintaining the data link.

[0028] Meanwhile, when the second receiving device receives a microphone pass switching request message, it can transmit an acknowledgement message from the first receiving device and transmit second packet data based on the second microphone to the wireless audio transmitting device.

[0029] Meanwhile, the second receiving device, when receiving a microphone pass switching request message, can transmit second packet data based on the second microphone to the wireless audio transmitting device through the second call link.

[0030] Meanwhile, if the first receiving device receives an acknowledgement message from the second receiving device after transmitting a microphone pass switching request message to the second receiving device, the first receiving device can stop transmitting the first packet data based on the first microphone while maintaining the data link.

[0031] Meanwhile, the first receiving device can establish or maintain a call link when a call link is required while maintaining a data link with the wireless audio transmitting device.

[0032] A wireless audio receiving device and a wireless audio output system including the same according to one embodiment of the present disclosure include a first receiving device that receives an audio signal of a first channel from a wireless audio transmitting device, and a second receiving device that receives an audio signal of a second channel from the wireless audio transmitting device, wherein the first receiving device transmits first packet data based on a first microphone to the wireless audio transmitting device via a call link with the wireless audio transmitting device, and, when a microphone path switching is required, transmits a microphone path switching request message to the second receiving device, and stops transmission of the first packet data based on the first microphone while maintaining the data link, and the second receiving device transmits second packet data based on the second microphone to the wireless audio transmitting device when receiving the microphone path switching request message. Accordingly, delay and packet loss due to microphone switching in a plurality of wireless receiving devices can be reduced. In particular, packet transmission due to microphone switching can be seamlessly performed through the second receiving device.

[0033] Meanwhile, when the second receiving device receives a microphone pass switching request message, it can transmit a confirmation response message from the first receiving device and transmit second packet data based on the second microphone to the wireless audio transmission device. Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0034] Meanwhile, upon receiving a microphone pass switching request message, the second receiving device can transmit second packet data based on the second microphone to the wireless audio transmitting device via the second call link. This reduces delay and packet loss due to microphone switching across multiple wireless receiving devices.

[0035] Meanwhile, the first receiving device transmits first packet data based on the first microphone to the wireless audio transmitting device via a call link, and when a microphone path switching is required, transmits a microphone path switching request message to the second receiving device, and when an acknowledgement message is received from the second receiving device, stops transmitting the first packet data based on the first microphone while maintaining the data link. Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0036] Meanwhile, the first receiving device can establish or maintain a call link when necessary while maintaining a data link with the wireless audio transmission device. This allows for the stable establishment or maintenance of a call link.

[0037] Meanwhile, when the second receiving device receives a microphone path switching request message while the wireless audio transmitting device and the first receiving device maintain a data link, the second receiving device can transmit second packet data based on the second microphone to the wireless audio transmitting device via the second call link. Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0038] Meanwhile, the second receiving device may transmit a microphone path switching required message to the first receiving device when the first receiving device is transmitting the first packet data based on the first microphone to the wireless audio transmitting device via a call link with the wireless audio transmitting device, if a microphone path switching is required. Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0039] Meanwhile, when the first receiving device receives a microphone path switching required message from the second receiving device, the first receiving device transmits a microphone path switching request message to the second receiving device and stops transmitting the first packet data based on the first microphone while maintaining the data link, and when the second receiving device receives the microphone path switching request message, it can transmit the second packet data based on the second microphone to the wireless audio transmitting device. Accordingly, delay and packet loss due to microphone switching in multiple wireless receiving devices can be reduced.

[0040] Meanwhile, when the second receiving device receives a microphone pass switching request message, it can transmit a confirmation response message from the first receiving device and transmit second packet data based on the second microphone to the wireless audio transmission device. Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0041] Meanwhile, upon receiving a microphone pass switching request message, the second receiving device can transmit second packet data based on the second microphone to the wireless audio transmitting device via the second call link. This reduces delay and packet loss due to microphone switching across multiple wireless receiving devices.

[0042] Meanwhile, if the first receiving device receives an acknowledgement message from the second receiving device after transmitting a microphone pass switching request message to the second receiving device, the first receiving device can stop transmitting the first packet data based on the first microphone while maintaining the data link. Accordingly, delay and packet loss due to microphone switching can be reduced across multiple wireless receiving devices.

[0043] Meanwhile, the first receiving device can establish or maintain a call link when necessary while maintaining a data link with the wireless audio transmission device. This allows for the stable establishment or maintenance of a call link.

[0044] Meanwhile, when the second receiving device receives a microphone path switching request message while the wireless audio transmitting device and the first receiving device maintain a data link, the second receiving device can transmit second packet data based on the second microphone to the wireless audio transmitting device via the second call link. Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0045] According to another embodiment of the present disclosure, a wireless audio receiving device and a wireless audio output system including the same include a first receiving device that receives an audio signal of a first channel from a wireless audio transmitting device, and a second receiving device that receives an audio signal of a second channel from the wireless audio transmitting device, wherein the second receiving device transmits a microphone path switching requirement message to the first receiving device when the first receiving device transmits first packet data based on a first microphone to the wireless audio transmitting device through a call link with the wireless audio transmitting device, and transmits second packet data based on a second microphone to the wireless audio transmitting device when a microphone path switching request message is received from the first receiving device. Accordingly, delay and packet loss due to microphone switching in a plurality of wireless receiving devices can be reduced. In particular, packet transmission due to microphone switching can be seamlessly performed through the second receiving device.

[0046] Meanwhile, when the first receiving device receives a microphone path switching requirement message from the second receiving device, it can transmit a microphone path switching request message to the second receiving device and stop transmission of the first packet data based on the first microphone while maintaining the data link. Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0047] Meanwhile, when the second receiving device receives a microphone pass switching request message, it can transmit a confirmation response message from the first receiving device and transmit second packet data based on the second microphone to the wireless audio transmission device. Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0048] Meanwhile, upon receiving a microphone pass switching request message, the second receiving device can transmit second packet data based on the second microphone to the wireless audio transmitting device via the second call link. This reduces delay and packet loss due to microphone switching across multiple wireless receiving devices.

[0049] Meanwhile, if the first receiving device receives an acknowledgement message from the second receiving device after transmitting a microphone pass switching request message to the second receiving device, the first receiving device can stop transmitting the first packet data based on the first microphone while maintaining the data link. Accordingly, delay and packet loss due to microphone switching can be reduced across multiple wireless receiving devices.

[0050] Meanwhile, the first receiving device can establish or maintain a call link when necessary while maintaining a data link with the wireless audio transmission device. This allows for the stable establishment or maintenance of a call link.

[0051] FIGS. 1A to 1E are diagrams illustrating a wireless audio system including a wireless audio receiving device and a wireless audio transmitting device according to various embodiments of the present disclosure.

[0052] FIG. 2a is an example of an internal block diagram of the wireless audio receiving device of FIGS. 1a to 1e.

[0053] FIG. 2b is an example of an internal block diagram of the wireless audio transmission device of FIGS. 1a to 1e.

[0054] FIGS. 3A to 8B are drawings for reference in explaining the operation of a wireless audio receiving device or a wireless audio transmitting device according to an embodiment of the present disclosure.

[0055] Figure 9a is a diagram illustrating a beacon section in ultra-wideband communication.

[0056] Figure 9b is a drawing referenced in the description of Figure 9a.

[0057] FIG. 10a is a diagram illustrating an example of an audio-only transmission mode in ultra-wideband communication.

[0058] FIG. 10b is a diagram illustrating an example of an audio sharing mode in ultra-wideband communication.

[0059] Figures 11a to 11c illustrate various examples of the operation of a wireless audio receiving device and a wireless audio transmitting device.

[0060] FIG. 12 is a diagram illustrating the operation of a wireless audio receiving device related to the present disclosure.

[0061] FIG. 13a is a flowchart illustrating an operation method of a wireless audio output system according to one embodiment of the present disclosure.

[0062] FIG. 13b is a flowchart illustrating an operation method of a wireless audio output system according to another embodiment of the present disclosure.

[0063] Figures 14a to 16 are drawings referenced in the description of Figure 13a or Figure 13b.

[0064] Hereinafter, the present disclosure will be described in more detail with reference to the drawings.

[0065] The suffixes "module" and "part" used in the following description are given solely for the convenience of writing this specification and do not impart any particularly significant meaning or role to the components themselves. Therefore, the terms "module" and "part" may be used interchangeably.

[0066] FIGS. 1A to 1E are diagrams illustrating a wireless audio system including a wireless audio receiving device and a wireless audio transmitting device according to various embodiments of the present disclosure.

[0067] First, FIG. 1a illustrates a wireless audio system (10a) according to one embodiment of the present disclosure.

[0068] Referring to the drawing, a wireless audio system (10a) according to one embodiment of the present disclosure may include a wireless audio transmitting device (50) and a wireless audio receiving device (100).

[0069] In particular, the wireless audio system (10a) is based on a unicast method, and a wireless audio transmission device (50) and a wireless audio reception device (100) can correspond one to one.

[0070] A wireless audio transmission device (50) may include a first communication module (135a) that wirelessly transmits a first audio signal according to a first communication standard of a first frequency band, and a second communication module (135b) that wirelessly transmits a second audio signal according to a second communication standard of a second frequency band greater than the first frequency band.

[0071] Meanwhile, the wireless audio receiving device (100) may include a first communication module (135a) that wirelessly receives a first audio signal according to a first communication standard of a first frequency band, and a second communication module (135b) that wirelessly receives a second audio signal according to a second communication standard of a second frequency band greater than the first frequency band.

[0072] For example, the wireless audio receiving device (100) outputs a first sound based on a first audio signal wirelessly according to a first communication standard of a first frequency band received from a first communication module (135a), and when the wireless environment is complex and the packet error rate of the first audio signal is higher than a predetermined value, the wireless audio receiving device (100) can output a second sound based on a second audio signal wirelessly according to a second communication standard of a second frequency band received from a second communication module (135b).

[0073] Accordingly, even in complex wireless environments, audio can be received and sound output reliably wirelessly.

[0074] Meanwhile, the wireless audio receiving device (100) receives a beacon signal from the first wireless audio transmitting device (50a) at a cycle (Pc) corresponding to the first active period (Pa) and the first inactive period (Pb), searches for an additional device during the first inactive period (Pb), and, when receiving a second beacon signal from the second wireless audio transmitting device (50b), transmits a connection request command to the second wireless audio transmitting device (50b), and, based on the connection request command, additionally establishes an ultra-wideband communication-based wireless connection to the second wireless audio transmitting device (50b) during the ultra-wideband communication-based wireless connection with the first wireless audio transmitting device (50a). Accordingly, frequency hopping can be performed in ultra-wideband communication using the beacon signal.

[0075] Next, FIG. 1b illustrates a wireless audio system (10b) according to another embodiment of the present disclosure.

[0076] Referring to the drawings, a wireless audio system (10b) according to another embodiment of the present disclosure may include a wireless audio transmitting device (50) and a plurality of wireless audio receiving devices (100a1, 100a2).

[0077] In particular, the wireless audio system (10b) may be equipped with a wireless audio transmission device (50) and a plurality of wireless audio reception devices (100a1, 100a2) based on a unicast method.

[0078] For example, when wireless audio signals of the first channel or the second channel are output from the wireless audio transmission device (50), the wireless audio signal of the first channel may be transmitted to the first wireless audio receiving device (100a1) among the plurality of wireless audio receiving devices (100a1, 100a2), and the wireless audio signal of the second channel may be transmitted to the second wireless audio receiving device (100a2). Accordingly, even in a complex wireless environment, audio can be received wirelessly and sound can be output stably.

[0079] Meanwhile, each wireless audio receiving device (100a1-100a2) outputs a first sound based on a first audio signal wirelessly according to a first communication standard of a first frequency band received from a first communication module (135a), and when the wireless environment is complex and the packet error rate of the first audio signal is higher than a predetermined value, the wireless audio receiving device (100a1-100a2) outputs a second sound based on a second audio signal wirelessly according to a second communication standard of a second frequency band received from a second communication module (135b). Accordingly, even in a complex wireless environment, audio can be received and sound can be output wirelessly in a stable manner.

[0080] Meanwhile, each wireless audio receiving device (100a1-100a2) receives a beacon signal from the first wireless audio transmitting device (50a) at a cycle (Pc) corresponding to a first active period (Pa) and a first inactive period (Pb), searches for an additional device during the first inactive period (Pb), and, when receiving a second beacon signal from the second wireless audio transmitting device (50b), transmits a connection request command to the second wireless audio transmitting device (50b), and, based on the connection request command, performs an ultra-wideband communication-based wireless connection to the second wireless audio transmitting device (50b) during an ultra-wideband communication-based wireless connection with the first wireless audio transmitting device (50a). Accordingly, frequency hopping can be performed in ultra-wideband communication using the beacon signal.

[0081] At this time, the plurality of wireless audio receiving devices (100a1, 100a2) may be wireless audio receiving devices for the left and right sides, respectively.

[0082] Next, FIG. 1c illustrates a wireless audio system (10c) according to another embodiment of the present disclosure.

[0083] Referring to the drawings, a wireless audio system (10c) according to another embodiment of the present disclosure may include a wireless audio transmitting device (50) and a plurality of wireless audio receiving devices (100b1-100b4).

[0084] In particular, the wireless audio system (10c) may be equipped with a wireless audio transmission device (50) and a plurality of wireless audio reception devices (100b1-100b4) based on a broadcast method.

[0085] For example, when wireless audio signals of channels 1 to 4 are output from a wireless audio transmission device (50), the wireless audio signal of the first channel may be transmitted to a first wireless audio receiving device (100b1) among a plurality of wireless audio receiving devices (100b1 to 100b4), the wireless audio signal of the second channel may be transmitted to a second wireless audio receiving device (100b2), the wireless audio signal of the third channel may be transmitted to a third wireless audio receiving device (100b3), and the wireless audio signal of the fourth channel may be transmitted to a fourth wireless audio receiving device (100b4). Accordingly, even in a complex wireless environment, audio can be stably received wirelessly and sound can be output.

[0086] Meanwhile, each wireless audio receiving device (100b1-100b4) outputs a first sound based on a first audio signal wirelessly according to a first communication standard of a first frequency band received from a first communication module (135a), and when the wireless environment is complex and the packet error rate of the first audio signal is higher than a predetermined value, the wireless audio receiving device (100b1-100b4) outputs a second sound based on a second audio signal wirelessly according to a second communication standard of a second frequency band received from a second communication module (135b). Accordingly, even in a complex wireless environment, audio can be received and sound can be output wirelessly in a stable manner.

[0087] Meanwhile, each wireless audio receiving device (100b1-100b4) receives a beacon signal from the first wireless audio transmitting device (50a) at a cycle (Pc) corresponding to the first active period (Pa) and the first inactive period (Pb), searches for an additional device during the first inactive period (Pb), and, when receiving a second beacon signal from the second wireless audio transmitting device (50b), transmits a connection request command to the second wireless audio transmitting device (50b), and, based on the connection request command, performs an ultra-wideband communication-based wireless connection to the second wireless audio transmitting device (50b) during the ultra-wideband communication-based wireless connection with the first wireless audio transmitting device (50a). Accordingly, frequency hopping can be performed in ultra-wideband communication using the beacon signal.

[0088] Next, FIG. 1d illustrates a wireless audio system (10d) according to another embodiment of the present disclosure.

[0089] Referring to the drawings, a wireless audio system (10d) according to another embodiment of the present disclosure may include a wireless audio transmitting device (50) and a plurality of wireless audio receiving devices (100c1-100c3).

[0090] In particular, the wireless audio system (10d) may be equipped with a wireless audio transmission device (50) and a plurality of wireless audio reception devices (100c1-100c3) based on a unicast method.

[0091] For example, when wireless audio signals of the first to third channels are output from the wireless audio transmission device (50), the wireless audio signal of the first channel may be transmitted to the first wireless audio receiving device (100c1) among the plurality of wireless audio receiving devices (100c1-100c3), the wireless audio signal of the second channel may be transmitted to the second wireless audio receiving device (100c2), and the wireless audio signal of the third channel may be transmitted to the third wireless audio receiving device (100c3).

[0092] As another example, when wireless audio signals of the first to third channels are output from the wireless audio transmitting device (50), the wireless audio signals of the first to third channels may be transmitted to the first wireless audio receiving device (100c1) among the plurality of wireless audio receiving devices (100c1 to 100c3), the first wireless audio receiving device (100c1) may output wireless audio signals of the second to third channels, the wireless audio signal of the second channel may be transmitted to the second wireless audio receiving device (100c2), and the wireless audio signal of the third channel may be transmitted to the third wireless audio receiving device (100c3).

[0093] Accordingly, even in complex wireless environments, audio can be received and sound output reliably wirelessly.

[0094] Meanwhile, each wireless audio receiving device (100c1-100c3) outputs a first sound based on a first audio signal wirelessly according to a first communication standard of a first frequency band received from a first communication module (135a), and when the wireless environment is complex and the packet error rate of the first audio signal is higher than a predetermined value, the wireless audio receiving device (100c1-100c3) outputs a second sound based on a second audio signal wirelessly according to a second communication standard of a second frequency band received from a second communication module (135b). Accordingly, even when the wireless environment is complex, audio can be received and sound can be output wirelessly in a stable manner.

[0095] Meanwhile, each wireless audio receiving device (100c1-100c3) receives a beacon signal from the first wireless audio transmitting device (50a) at a cycle (Pc) corresponding to the first active period (Pa) and the first inactive period (Pb), searches for an additional device during the first inactive period (Pb), and, when receiving a second beacon signal from the second wireless audio transmitting device (50b), transmits a connection request command to the second wireless audio transmitting device (50b), and, based on the connection request command, performs an ultra-wideband communication-based wireless connection to the second wireless audio transmitting device (50b) during the ultra-wideband communication-based wireless connection with the first wireless audio transmitting device (50a). Accordingly, frequency hopping can be performed in ultra-wideband communication using the beacon signal.

[0096] Next, FIG. 1e illustrates a wireless audio system (10e) according to another embodiment of the present disclosure.

[0097] Referring to the drawings, a wireless audio system (10e) according to another embodiment of the present disclosure may include a plurality of wireless audio receiving devices (100d1, 100d2).

[0098] In particular, the wireless audio system (10e) may be equipped with a plurality of wireless audio receiving devices (100d1, 100d2) based on a unicast method.

[0099] For example, when a wireless audio signal is output from a first wireless audio receiving device (100d1), the wireless audio signal can be transmitted to a second wireless audio receiving device (100d2).

[0100] Accordingly, even in complex wireless environments, audio can be received and sound output reliably wirelessly.

[0101] Meanwhile, each wireless audio receiving device (100d1, 100d2) outputs a first sound based on a first audio signal wirelessly according to a first communication standard of a first frequency band received from a first communication module (135a), and when the wireless environment is complex and the packet error rate of the first audio signal is higher than a predetermined value, the wireless audio receiving device (100d1, 100d2) outputs a second sound based on a second audio signal wirelessly according to a second communication standard of a second frequency band received from a second communication module (135b). Accordingly, even in a complex wireless environment, audio can be received and sound can be output wirelessly in a stable manner.

[0102] Meanwhile, each wireless audio receiving device (100d1, 100d2) receives a beacon signal from the first wireless audio transmitting device (50a) at a cycle (Pc) corresponding to the first active period (Pa) and the first inactive period (Pb), searches for an additional device during the first inactive period (Pb), and, when receiving a second beacon signal from the second wireless audio transmitting device (50b), transmits a connection request command to the second wireless audio transmitting device (50b), and, based on the connection request command, performs an ultra-wideband communication-based wireless connection to the second wireless audio transmitting device (50b) during the ultra-wideband communication-based wireless connection with the first wireless audio transmitting device (50a). Accordingly, frequency hopping can be performed in ultra-wideband communication using the beacon signal.

[0103] Meanwhile, the wireless audio transmission device (50) illustrated in FIGS. 1a to 1e can be used in mobile terminals, TVs, monitors, tablets, home appliances, vehicle display devices, etc.

[0104] FIG. 2a is an example of an internal block diagram of the wireless audio receiving device of FIGS. 1a to 1e.

[0105] Referring to the drawing, the wireless audio receiving device (100) may include a sensing unit (130), a communication device (135), a memory (140), a sound output device (160), a processor (170), an input unit (185), and a power supply unit (190). When implemented in an actual application, these components may be combined into one component or one component may be subdivided into two or more components as needed.

[0106] The sensing unit (130) may be equipped with an inertial sensor (131). The inertial sensor may include an acceleration sensor, a gyro sensor, a gravity sensor, etc. For example, the acceleration sensor, gyro sensor, gravity sensor, etc. may be equipped with a 6-axis sensor.

[0107] The sensing unit (130) can output motion information of the wireless audio receiving device (100), for example, movement information (acceleration information, angular velocity information) or position information based on the x, y, and z axes.

[0108] Meanwhile, the sensing unit (130) may be equipped with a sensor for acquiring user body information. For example, it may be equipped with a blood pressure sensor, brain wave sensor, etc.

[0109] Meanwhile, the communication device (135) may provide an interface for communication with an external device. To this end, the communication device (135) may include at least one of a mobile communication module (not shown), a wireless Internet module (not shown), a short-range communication module (not shown), and a GPS module (not shown).

[0110] For example, the communication device (135) can perform IR communication, Bluetooth communication, or WiFi communication, and thereby exchange data with or transmit data to the paired wireless audio transmission device (50). In particular, it can receive an audio signal from the paired wireless audio transmission device (50).

[0111] Meanwhile, the communication device (135) may include a first communication module (135a) that wirelessly receives a first audio signal according to a first communication standard of a first frequency band, and a second communication module (135b) that wirelessly receives a second audio signal according to a second communication standard of a second frequency band greater than the first frequency band.

[0112] Meanwhile, the communication device (135) may further include a processor (135c) for signal processing or control of the first communication module (135a) and the second communication module (135b).

[0113] Meanwhile, the first communication module (135a) receives the first signal data through the first channel (CH1), and receives the first audio data separately through the second channel (CH2), and the second communication module (135b) receives the second signal data and the second audio data separately through the same channel (CHm).

[0114] Accordingly, even in complex wireless environments, audio can be reliably received and sound output wirelessly. Furthermore, the first communication module (135a) and the second communication module (135b) can distinguish between signal data and audio data, enabling stable wireless audio reception and sound output.

[0115] Meanwhile, the beacon signal received by the second communication module (135b) may include unicast information or broadcast information. Accordingly, it is possible to operate by distinguishing between unicast and broadcast.

[0116] Meanwhile, the second communication module (135b) can transmit association request information to the wireless audio transmission device (50 or 100) and receive association response information from the wireless audio transmission device (50 or 100) when unicast information is included in the received beacon signal. Accordingly, it can operate by distinguishing between unicast and broadcast.

[0117] Meanwhile, the second communication module (135b) can distinguish between second signal data and second audio data based on identification information within the header of the received second audio signal. Accordingly, signal data and audio data can be distinguished, enabling stable wireless audio reception and sound output.

[0118] Meanwhile, the second communication module (135b) can distinguish whether the received second audio signal is second signal data or second audio data based on identification information within the Media Access Control (MAC) header or Physical (PHY) header. Accordingly, signal data and audio data can be distinguished, enabling stable wireless audio reception and sound output.

[0119] Meanwhile, the second communication module (135b), when receiving second signal data, extracts encoding or decoding information of the second standard, and based on the extracted encoding or decoding information, receives second audio data after the second signal data, and can set the playback time of the second audio data. Accordingly, signal data and audio data can be distinguished, and audio can be stably received wirelessly and sound output can be achieved.

[0120] The memory (140) may store a program for processing or controlling the processor (170) within the wireless audio receiving device (100), or may perform a function for temporarily storing input or output data.

[0121] The sound output device (160) can output an audio signal processed by the processor (170) in the wireless audio receiving device (100).

[0122] Alternatively, the sound output device (160) can output guide information related to the operation of the wireless audio receiving device (100) as an audio signal.

[0123] Meanwhile, the sound output device (160) can output a first sound corresponding to a first audio signal from a first communication module (135a) or a second sound corresponding to a second audio signal from a second communication module (135b).

[0124] The processor (170) can control the overall operation of the wireless audio receiving device (100) by controlling the operation of each unit within the wireless audio receiving device (100).

[0125] Meanwhile, the processor (170) can perform signal processing on an audio signal received from the outside.

[0126] Meanwhile, the processor (170) can reproduce an audio signal from the first communication module (135a) or the second communication module (135b).

[0127] Meanwhile, the processor (170) can reproduce second audio data based on decryption information and a set playback time from the second communication module (135b). Accordingly, signal data and audio data can be distinguished, enabling stable wireless audio reception and sound output.

[0128] Meanwhile, the input unit (185) may be equipped with buttons for initializing the wireless audio receiving device (100) or for inputting operations, etc.

[0129] Meanwhile, the input unit (185) may be equipped with a microphone (187) for sound collection.

[0130] Meanwhile, the input unit (185) may be equipped with a camera (not shown) for taking images.

[0131] For example, as illustrated in FIG. 2a, the input unit (185) may include a power key (185a) for turning the power on or off, a FF / REW key (185b) for going back or forward in the playing audio, a volume key (185c) for turning the volume up or down, a pause / play key (185d) for playing or pausing the audio, etc.

[0132] The power supply unit (190) can supply power required for the operation of each component under the control of the processor (170).

[0133] In particular, the power supply unit (190) may be equipped with a battery (195) that stores and outputs direct current power.

[0134] FIG. 2b is an example of an internal block diagram of the wireless audio transmission device of FIGS. 1a to 1e.

[0135] Referring to the drawing, the wireless audio transmission device (50) may include a sensing unit (130b), a communication unit (135b), a memory (140b), a sound output device (160b), a processor (170b), a display (180b), an input unit (185b), and a power supply unit (190b). When implemented in an actual application, these components may be combined into one component or one component may be subdivided into two or more components as needed.

[0136] The sensing unit (130b) may be equipped with an inertial sensor (131b). The inertial sensor may include an acceleration sensor, a gyro sensor, a gravity sensor, etc. For example, the acceleration sensor, gyro sensor, gravity sensor, etc. may be equipped with a 6-axis sensor.

[0137] The sensing unit (130b) can output motion information of the wireless audio transmission device (50), for example, movement information (acceleration information, angular velocity information) or position information based on the x, y, and z axes.

[0138] Meanwhile, the sensing unit (130b) may be equipped with a sensor for acquiring user body information. For example, it may be equipped with a blood pressure sensor, brain wave sensor, etc.

[0139] Meanwhile, the communication device (135b) may provide an interface for communication with an external device. To this end, the communication device (135b) may include at least one of a mobile communication module (not shown), a wireless Internet module (not shown), a short-range communication module (not shown), and a GPS module (not shown).

[0140] For example, the communication device (135b) can perform IR communication, Bluetooth communication, or WiFi communication, and thereby exchange data with or transmit data to the paired wireless audio receiving device (100). In particular, it can transmit an audio signal to the paired wireless audio receiving device (100).

[0141] Meanwhile, the communication device (135b) may include a first communication module (135ab) that wirelessly transmits a first audio signal according to a first communication standard of a first frequency band, and a second communication module (135bb) that wirelessly transmits a second audio signal according to a second communication standard of a second frequency band (e.g., ultra-wideband) that is larger than the first frequency band.

[0142] Meanwhile, the second communication module (135bb) may be equipped with a PAN (Personal Area Network) coordinator (PNb) for ultra-wideband communication.

[0143] Meanwhile, the communication device (135b) may further include a processor (135cb) for signal processing or control of the first communication module (135ab) and the second communication module (135bb).

[0144] Meanwhile, the first communication module (135ab) transmits the first signal data through the first channel (CH1b) and transmits the first audio data separately through the second channel (CH2), and the second communication module (135bb) transmits the second signal data and the second audio data separately through the same channel (CHm).

[0145] Accordingly, even in complex wireless environments, audio signals can be transmitted wirelessly and reliably. Furthermore, the first communication module (135ab) and the second communication module (135bb) can distinguish between signal data and audio data, enabling stable wireless audio signal transmission.

[0146] Meanwhile, the beacon signal transmitted from the second communication module (135bb) may include unicast information or broadcast information. Accordingly, it can be operated by distinguishing between unicast and broadcast.

[0147] Meanwhile, the second communication module (135bb) can receive association request information from the wireless audio receiving device (100) and transmit association response information to the wireless audio receiving device (100) when unicast information is included in the transmitted beacon signal. Accordingly, it can operate by distinguishing between unicast and broadcast.

[0148] Meanwhile, the second communication module (135bb) can distinguish between second signal data and second audio data based on identification information within the header of the transmitted second audio signal. Accordingly, signal data and audio data can be distinguished, enabling stable wireless transmission of audio signals.

[0149] Meanwhile, the second communication module (135bb) can distinguish whether the transmitted second audio signal is second signal data or second audio data based on identification information within the Media Access Control (MACb) header or the Physical (PHYb) header. Accordingly, signal data and audio data can be distinguished, enabling stable wireless transmission of audio signals.

[0150] The memory (140b) may store a program for processing or controlling the processor (170b) in the wireless audio transmission device (50), or may perform a function for temporarily storing input or output data.

[0151] The sound output device (160b) can output an audio signal processed by the processor (170b) in the wireless audio transmission device (50).

[0152] Alternatively, the sound output device (160b) can output guide information related to the operation of the wireless audio transmission device (50) as an audio signal.

[0153] The processor (170b) can control the overall operation of the wireless audio transmission device (50) by controlling the operation of each unit within the wireless audio transmission device (50).

[0154] Meanwhile, the processor (170b) can perform signal processing on an audio signal received from the outside.

[0155] Meanwhile, the processor (170b) can control the operation of each unit based on data from the first communication module (135ab) or the second communication module (135bb).

[0156] The display (180b) may include an LDC, OLED, LED, or micro LED.

[0157] Meanwhile, the input unit (185b) may be equipped with a button for initializing the wireless audio transmission device (50) or for inputting an operation.

[0158] Meanwhile, the input unit (185b) may be equipped with a microphone (187b) for sound collection.

[0159] Meanwhile, the input unit (185b) may be equipped with a camera (not shown) for taking images.

[0160] For example, as illustrated in FIG. 2b, the input unit (185b) may be provided with a power key (185ab) for turning the power on or off, a FF / REW key (185bb) for going back or forward in the playing audio, a volume key (185cb) for turning the volume up or down, a pause / play key (185db) for playing or pausing the audio, etc.

[0161] The power supply unit (190b) can supply power required for the operation of each component under the control of the processor (170b).

[0162] In particular, the power supply unit (190b) may be equipped with a battery (195b) that stores and outputs direct current power.

[0163] FIGS. 3A to 8B are drawings for reference in explaining the operation of a wireless audio receiving device or a wireless audio transmitting device according to an embodiment of the present disclosure.

[0164] FIG. 3a illustrates outputting first signal data (Sa1) and first audio data (Sa2) from a wireless audio transmitting device (50) to a wireless audio receiving device (100).

[0165] Referring to the drawing, the wireless audio transmission device (50) wirelessly outputs first signal data (Sa1) and first audio data (Sa2) according to the first communication standard of the first frequency band.

[0166] In particular, the wireless audio transmission device (50) can transmit first signal data (Sa1) through a first channel (CH1) and can separately transmit first audio data (Sa2) through a second channel (CH2).

[0167] Accordingly, the first communication module (135a) in the wireless audio receiving device (100) according to one embodiment of the present disclosure receives first signal data (Sa1) through a first channel (CH1) and receives first audio data (Sa2) through a second channel (CH2).

[0168] FIG. 3b illustrates outputting second signal data (Sb1) and second audio data (Sb2) from a wireless audio transmitting device (50) to a wireless audio receiving device (100).

[0169] Referring to the drawing, the wireless audio transmission device (50) wirelessly outputs second signal data (Sb1) and second audio data (Sb2) according to a second communication standard of a second frequency band greater than the first frequency band.

[0170] In particular, the wireless audio transmission device (50) can transmit second signal data (Sb1) and second audio data (Sb2) separately through the same channel (CHm).

[0171] Accordingly, the second communication module (135b) in the wireless audio receiving device (100) according to one embodiment of the present disclosure receives second signal data (Sb1) and second audio data (Sb2) separately through the same channel (CHm).

[0172] Meanwhile, the first communication standard may be a Bluetooth communication standard, and the second communication standard may be a UWB (Ultra-wideband) communication standard.

[0173] For example, a wireless audio transmission device (50) may wirelessly transmit an audio signal according to a first communication standard, and in a complex wireless environment, may wirelessly transmit an audio signal according to a second communication standard.

[0174] Accordingly, the wireless audio receiving device (100) can reliably receive audio wirelessly and output sound even in complex wireless environments. Furthermore, the first communication module (135a) and the second communication module (135b) can distinguish between signal data and audio data, enabling the device to reliably receive audio wirelessly and output sound.

[0175] Meanwhile, the first communication module (135a) according to one embodiment of the present disclosure transmits first signal data (Sa1) through a first channel (CH1), and transmits first audio data (Sa2) separately through a second channel (CH2), and the second communication module (135b) can transmit second signal data (Sb1) and second audio data (Sb2) separately through the same channel (CHm). Accordingly, even in a complex wireless environment, audio can be transmitted wirelessly in a stable manner. In addition, signal data and audio data can be transmitted separately.

[0176] Meanwhile, the beacon signal transmitted from the second communication module (135b) within the wireless audio transmission device (50) may include unicast information or broadcast information. Accordingly, it is possible to operate by distinguishing between unicast and broadcast.

[0177] Meanwhile, the second communication module (135b) within the wireless audio transmission device (50) can receive association request information from the wireless audio reception device (100) and transmit association response information from the electronic device to the wireless audio reception device (100) when unicast information is included in the transmitted beacon signal. Accordingly, it is possible to operate by distinguishing between unicast and broadcast. In addition, it is possible to check whether ultra-wideband (UWB) wireless audio support is possible and to transmit audio data wirelessly.

[0178] Meanwhile, the second communication module (135b) within the wireless audio transmission device (50) may add identification information within the media access control (MAC) header or physical (PHY) header to distinguish whether the transmitted second audio signal is second signal data (Sb1) or second audio data (Sb2). Accordingly, it becomes possible to operate by distinguishing between unicast and broadcast.

[0179] Meanwhile, when a first audio signal is transmitted from a first communication module (135a) in a wireless audio transmission device (50) and a second audio signal is transmitted from a second communication module (135b), the HCI (Host Control Interface) data of the first communication standard is mapped to the MLME (MAC Layer Management Entity) interface of the second communication standard, and the ACL (Asynchronous Connection-Less) data and audio data of the first communication standard can be mapped to the MCPS (MAC Common Part Sublayer) interface of the second communication standard. Accordingly, signal data and audio data can be distinguished, so that audio can be transmitted wirelessly in a stable manner.

[0180] Meanwhile, when transmitting a first audio signal from a first communication module (135a) within a wireless audio transmission device (50) and then transmitting a second audio signal from a second communication module (135b), data of the first communication standard can be mapped to data of the second communication standard using an adaptation layer (AL). Accordingly, signal data and audio data can be distinguished, enabling stable wireless audio transmission.

[0181] Meanwhile, when the second communication module (135b) within the wireless audio transmission device (50) transmits a second audio signal, the second signal data (Sb1) can be transmitted in a contention access period (CAP) within the beacon period (PRa), and the second audio data (Sb2) can be transmitted in a contention free period (CFP) within the beacon period (PRa). Accordingly, the signal data and audio data can be distinguished, thereby enabling stable wireless audio transmission.

[0182] Meanwhile, the first communication module (135a) within the wireless audio transmission device (50) transmits first signal data (Sa1), transmits identification information within the first signal data (Sa1) to the second communication module (135b), and the second communication module (135b) can distinguish and transmit second signal data (Sb1) within the second audio signal based on the identification information from the first communication module (135a). Accordingly, signal data and audio data can be distinguished, enabling stable wireless audio transmission.

[0183] Meanwhile, the first communication module (135a) within the wireless audio transmission device (50) transmits first audio data (Sa2), transmits identification information within the first audio data (Sa2) to the second communication module (135b), and the second communication module (135b) can distinguish and transmit second audio data (Sb2) within the second audio signal based on the identification information from the first communication module (135a). Accordingly, signal data and audio data can be distinguished, enabling stable wireless audio transmission.

[0184] Meanwhile, the second communication module (135b) within the wireless audio transmission device (50) receives a security activation value from the wireless audio reception device (100), and if the values ​​match, generates a key and uses the generated key to encrypt and transmit the second audio data (Sb2). Accordingly, audio can be transmitted wirelessly and stably based on security.

[0185] FIG. 3c is a drawing explaining the operation of the first communication module (135a) of the wireless audio transmitting device (50) and the wireless audio receiving device (100).

[0186] Referring to the drawing, the wireless audio transmission device (50) can wirelessly transmit beacon data at a To time point during the beacon period (PRa), and the wireless audio reception device (100) can wirelessly receive the beacon data.

[0187] Meanwhile, the wireless audio transmission device (50) can transmit signal data in a contention access period (CAP) among the beacon period (PRa) and transmit audio data in a contention free period (CFP) among the beacon period (PRa).

[0188] In particular, the drawing illustrates transmitting signal data between time points T1 to T3 within a contention access period (CAP) and transmitting audio data between time points T5 to T7 within a contention free period (CFP).

[0189] In response to this, the wireless audio receiving device (100) can receive signal data between time points T2 and T4 within a contention access period (CAP), and can receive audio data between time points T6 and T8 within a contention free period (CFP).

[0190] That is, when the second communication module (135b) within the wireless audio receiving device (100) receives the second audio signal, the second signal data (Sb1) can be received in the Contention Access Period (CAP) of the beacon period (PRa), and the second audio data (Sb2) can be received in the Contention Free Period (CFP) of the beacon period (PRa). Accordingly, the signal data and the audio data can be distinguished, so that audio can be received wirelessly and sound can be output stably.

[0191] Figure 4 is a diagram for explaining the mapping between the first communication standard and the second communication standard.

[0192] Referring to the drawing, in order to provide UWB audio service, which is an example of a second communication standard, Bluetooth audio, which is an example of a first communication standard optimized for audio service as a higher protocol, is adopted.

[0193] Bluetooth Audio (BTA) interface consists of HCI Control, ACL Data, and Audio Data.

[0194] Meanwhile, the UWB media access control or physical layer (MAC / PHY) (UMP) may have an MLME (MAC Layer Management Entity) interface and an MCPS (MAC Common Part Sublayer) interface.

[0195] Meanwhile, for mapping between Bluetooth audio (BTA) and UWB's media access control or physical layer (MAC / PHY) (UMP), the embodiment of the present disclosure utilizes an adaptation layer (AL).

[0196] The adaptation layer (AL) can map the Host Control Interface (HCI) data of the first communication standard to the MAC Layer Management Entity (MLME) interface of the second communication standard, and map the Asynchronous Connection-Less (ACL) data and audio data of the first communication standard to the MAC Common Part Sublayer (MCPS) interface of the second communication standard.

[0197] Meanwhile, since UWB wireless transmission or reception has a different frequency band (3.1 GHz to 10.6 GHz) than the unlicensed band (2.4 GHz), it can avoid frequency interference with other wireless devices using the unlicensed band and solve problems such as audio interruption.

[0198] Additionally, UWB wireless transmission or reception provides a higher PHY Data Rate than Bluetooth wireless transmission or reception, enabling high-quality audio services.

[0199] Meanwhile, when a first audio signal is received from a first communication module (135a) and a second audio signal is received from a second communication module (135b), the HCI (Host Control Interface) data of the first communication standard is mapped to the MLME (MAC Layer Management Entity) interface of the second communication standard, and the ACL (Asynchronous Connection-Less) data and audio data of the first communication standard can be mapped to the MCPS (MAC Common Part Sublayer) interface of the second communication standard. Accordingly, signal data and audio data can be distinguished, so that audio can be received wirelessly and sound can be output stably.

[0200] Meanwhile, when a first audio signal is received from a first communication module (135a) and a second audio signal is received from a second communication module (135b), data of the first communication standard can be mapped to data of the second communication standard using an adaptation layer (AL). Accordingly, signal data and audio data can be distinguished, enabling stable wireless audio reception and sound output.

[0201] Figures 5a and 5b are drawings illustrating an operation description of a wireless audio transmission device.

[0202] Referring to the drawing, the signal data handler (SDH) in the Bluetooth audio (BTA) of the wireless audio transmission device (50) can define an identifier for distinguishing signal data and audio data using the Vendor OUI Field of the UWB MAC Header.

[0203] Fig. 5a illustrates signal data (SDT) when Vendor OUI is '1', and Fig. 5b illustrates audio data (ADT) when Vendor OUI is '2'.

[0204] In particular, the Bluetooth audio (BTA) of the wireless audio transmission device (50) can transmit signal data (SDT) for the codec and QoS configuration used in the UWB audio service.

[0205] Meanwhile, when transmitting signal data (SDT) to the UWB media access control or physical layer (MAC / PHY) (UMP), the wireless audio transmission device (50) can transmit it by setting the Vendor OUI, which is the UWB MAC Header, to '1'.

[0206] Meanwhile, in the wireless audio receiving device (100), when the codec and QoS Configuration are completed, audio data is transmitted from the audio codec to the Bluetooth audio (BTA), and the Bluetooth audio (BTA) sets the Vendor OUI, which is the UWB MAC Header, to '2' so that it can be transmitted to the UWB media access control or physical layer (MAC / PHY) (UMP).

[0207] In addition, the wireless audio transmission device (50) can transmit audio data to the wireless audio reception device (100) using the UWB media access control or physical layer (MAC / PHY) (UMP). Accordingly, even in a complex wireless environment, audio can be received and sound can be output reliably wirelessly.

[0208] Figures 6a and 6b are drawings illustrating an operation description of a wireless audio receiving device.

[0209] Referring to the drawing, an identifier for distinguishing between signal data and audio data of Bluetooth audio (BTA) can be defined through the MCPS interface of the wireless audio receiving device (100).

[0210] Fig. 6a illustrates signal data (SDR) when Vendor OUI is '1', and Fig. 6b illustrates audio data (ADR) when Vendor OUI is '2'.

[0211] When the UWB media access control or physical layer (MAC / PHY) (UMP) of the wireless audio receiving device (100) receives data in which the Vendor OUI, which is the UWB MAC Header, is set to '1', the Bluetooth audio (BTA) can move to the signal data handler (SDH).

[0212] In particular, the Bluetooth audio (BTA) of the wireless audio receiving device (100) can receive the codec and QoS information used in the UWB audio service through the signal data handler (SDH) and set the information required for receiving audio data.

[0213] Meanwhile, when the codec and QoS Configuration for the UWB audio service are completed, data with a UWB MAC Header Vendor OUI of '2' is received, and Bluetooth audio (BTA) can move to the audio data handler (ADH).

[0214] Bluetooth Audio (BTA) sets a playback time for audio data received via the Audio Data Handler (ADH), and the audio data with the set playback time is then passed to the audio codec. This allows for stable wireless audio reception and sound output even in complex wireless environments.

[0215] Figure 7 is a diagram referenced to explain UWB audio playback time synchronization.

[0216] Referring to the drawing, the wireless audio transmission device (50) can sequentially transmit first to fourth audio data (AD1 to AD4) to a plurality of wireless audio reception devices (100a1, 100a2).

[0217] In particular, the wireless audio transmission device (50) can sequentially transmit the first to fourth audio data (AD1 to AD4) for each channel in the beacon section.

[0218] In the drawing, it is illustrated that at time K0, first audio data (AD1) is generated and transmitted to the first wireless audio receiving device (100a1) in the PRa2a section between time K1 and time K2, and to the second wireless audio receiving device (100a2) in the PRa2b section between time K2 and time K3.

[0219] Meanwhile, the PRa2a section and the PRa2b section can each be set by a plurality of wireless audio receiving devices (100a1, 100a2) that receive audio data.

[0220] Similarly, at time K3, second audio data (AD2) can be generated and transmitted to the first wireless audio receiving device (100a1) and the second wireless audio receiving device (100a2) within the second beacon period (PRb).

[0221] Similarly, at time K4, third audio data (AD3) may be generated and transmitted to the first wireless audio receiving device (100a1) and the second wireless audio receiving device (100a2) within the third beacon period (PRc).

[0222] Similarly, at time K6, fourth audio data (AD4) may be generated and transmitted to the first wireless audio receiving device (100a1) and the second wireless audio receiving device (100a2) within the fourth beacon period (PRd).

[0223] Meanwhile, in order to synchronize and play back the first audio data (AD1) received in the first beacon section (PRa) in multiple wireless audio receiving devices (100a1, 100a2), it is preferable that it is not played back in the second beacon section (PRb) but played back at the K5 point in time during the third beacon section (PRc).

[0224] That is, after receiving audio data, it is desirable to play it in the next beacon section rather than the next beacon section.

[0225] Meanwhile, it is desirable that the period (PRw) from the point of completion of audio data reception (K3) to the point of start of playback (K5) be longer than the length of the beacon period. Accordingly, audio data can be played back in stable synchronization.

[0226] Meanwhile, it is preferable that the first audio data (AD1) be played at point K5, and then the second audio data (AD2) be played at point K7, spaced apart by the beacon interval. Accordingly, audio data can be played in stable synchronization.

[0227] FIG. 8a and FIG. 8b illustrate a wireless audio system (10f) having an AP device (AP), a plurality of wireless audio transmitting devices (50a to 50d), and a plurality of wireless audio receiving devices (100a1 to 100a6).

[0228] As shown in Fig. 8a, in a complex wireless environment, when transmitting audio wirelessly using Bluetooth communication, which is the same first communication standard, between multiple wireless audio transmitting devices (50a to 50d) and multiple wireless audio receiving devices (100a1 to 100a6), audio data transmission becomes impossible due to frequency interference.

[0229] In Fig. 8a, it is illustrated that audio data transmission is impossible due to frequency interference between a third wireless audio transmitting device (50c) and a plurality of wireless audio receiving devices (100a5 to 100a6).

[0230] To address these issues, embodiments of the present disclosure utilize a second communication standard having a wider frequency band and bandwidth than the first communication standard. The second communication standard may be UWB.

[0231] As shown in Fig. 8b, in a situation where the wireless environment is complex, it is preferable that among the plurality of wireless audio transmitting devices (50a to 50d) and the plurality of wireless audio receiving devices (100a1 to 100a6), the devices except for the third wireless audio transmitting device (50c) and the plurality of wireless audio receiving devices (100a5 to 100a6) use the first communication standard, Bluetooth communication, and the third wireless audio transmitting device (50c) and the plurality of wireless audio receiving devices (100a5 to 100a6) use UWB communication. Accordingly, even in a situation where the wireless environment is complex, stable transmission and reception of wireless audio data is possible.

[0232] Meanwhile, ultra-wideband (UWB) communication can be suitable for situations with complex wireless environments because it has the characteristics of low frequency congestion and strong interference resistance.

[0233] Accordingly, UWB communication is used to detect indoor positioning, but in this disclosure, it is used for audio services.

[0234] Meanwhile, UWB communication can be provided as a standard specification such as IEEE 802.15.4.

[0235] Figure 9a is a diagram illustrating a beacon section in ultra-wideband communication.

[0236] As shown in the drawing, according to the standard specification of IEEE 802.15.4 for ultra-wideband (UWB) communication, a beacon period (BI) includes a first period (Pa) for transmitting a beacon signal (Beacon), a second period (Pb) corresponding to a contention access period (CAP), a third period (Pc) corresponding to a contention free period (CFP), and an inactive period (Pd).

[0237] Meanwhile, the active section includes the first section (Pa), the second section (Pb), and the third section (Pc), and the active section can be named a superframe period (Superframe Duration; SD).

[0238] Meanwhile, after the end of the beacon period (BI), the first period (Pa2) for transmitting the beacon signal (Beacon) is redeployed in the additional beacon period (BI).

[0239] A wireless audio transmission device (50) can transmit audio data to a wireless audio reception device (100) using the beacon section (BI) of FIG. 9a via ultra-wideband communication.

[0240] Meanwhile, the wireless audio receiving device (100) can receive audio data from the wireless audio receiving device (100) using the beacon section (BI) of FIG. 9a through ultra-wideband communication.

[0241] Meanwhile, in the inactive section rather than the active section, the wireless audio transmitting device (50) and the wireless audio receiving device (100) operate at low power.

[0242] Figure 9b is a drawing referenced in the description of Figure 9a.

[0243] Referring to the drawings, FIG. 9b is similar to FIG. 9a, but only shows the active section of the beacon section (BI).

[0244] The beacon period (BI) includes a first period (Pa) for transmitting a beacon signal, a second period (Pb) corresponding to a contention access period (CAP), and a third period (Pc) corresponding to a contention free period (CFP).

[0245] Meanwhile, the second section (Pb) corresponds to the section for broadcast data transmission.

[0246] Meanwhile, the third section (Pc) is a section for unicast data transmission and includes a guaranteed time slot.

[0247] According to the communication standard, in order to transmit unicast audio data in a unicast manner from a wireless audio transmission device (50), a wireless audio receiving device (100) must be connected to the wireless audio transmission device (50).

[0248] Meanwhile, in order to transmit unicast audio data in a unicast manner from a wireless audio transmission device (50), a PAN coordinator (PNb) in a communication device (135b) within the wireless audio transmission device (50) allocates a guaranteed time slot (GTS) and transmits information about the allocated guaranteed time slot (GTS) to a wireless audio reception device (100).

[0249] In response to this, the wireless audio receiving device (100) receives unicast audio data through a guaranteed time slot (GTS) within the third section (Pc) based on information about the allocated guaranteed time slot (GTS).

[0250] Meanwhile, according to the communication standard, in order to transmit broadcast audio data from a wireless audio transmission device (50), a plurality of wireless audio receiving devices (100) must be connected to the wireless audio transmission device (50).

[0251] Meanwhile, a PAN coordinator (PNb) in a communication device (135b) within a wireless audio transmission device (50) checks for an empty period during a contention access period within a second section (Pb) in order to transmit broadcast audio data to a plurality of wireless audio reception devices, and allocates and transmits broadcast audio data during the empty period.

[0252] In this way, the transmission time of broadcast audio data cannot be guaranteed due to interference from surrounding signals.

[0253] In addition, the wireless audio receiving device (100) has a disadvantage in that it consumes significant power because it must monitor the entire contention access period within the second section (Pb) because it does not know when broadcast audio data will be received.

[0254] In this disclosure, a method for easily and quickly sharing audio data in ultra-wideband communications is proposed. This method is described with reference to FIG. 10a and below.

[0255] FIG. 10a is a diagram illustrating an example of an audio-only transmission mode in ultra-wideband communication.

[0256] Referring to the drawing, in an audio-only transmission mode in ultra-wideband communication, a mobile terminal (600) can transmit unicast audio data to a wireless audio receiving device (100a).

[0257] At this time, the mobile terminal (600) transmits unicast audio data to a cradle device (200) that can charge a wireless audio receiving device (100a) by placing it inside, and the cradle device (200) can transmit the unicast audio data to the wireless audio receiving device (100a).

[0258] At this time, ultra-wideband communication can be performed between the cradle device (200) and the wireless audio receiving device (100a).

[0259] Meanwhile, the mobile terminal (600) and the cradle device (200) can exchange audio data through ultra-wideband communication or another communication method.

[0260] FIG. 10b is a diagram illustrating an example of an audio sharing mode in ultra-wideband communication.

[0261] Referring to the drawing, in an audio sharing mode in ultra-wideband communication, a mobile terminal (600) can transmit broadcast audio data to a plurality of wireless audio receiving devices (100a, 100m, 100n).

[0262] At this time, the mobile terminal (600) transmits audio data to a cradle device (200) that can charge the first wireless audio receiving device (100a) among the plurality of wireless audio receiving devices (100a, 100m, 100n) by placing it therein, and the cradle device (200) can transmit broadcast audio data to the plurality of wireless audio receiving devices (100a, 100m, 100n).

[0263] At this time, ultra-wideband communication can be performed between the cradle device (200) and multiple wireless audio receiving devices (100a, 100m, 100n).

[0264] Meanwhile, the mobile terminal (600) and the cradle device (200) can exchange audio data through ultra-wideband communication or another communication method.

[0265] The audio data transmitted between the mobile terminal (600) and the cradle device (200) at this time may be unicast audio data or broadcast audio data.

[0266] For example, if the audio data transmitted between the mobile terminal (600) and the cradle device (200) is unicast audio data, the execution of the audio sharing mode is performed by the cradle device (200), not the mobile terminal (600).

[0267] As another example, if the audio data transmitted between the mobile terminal (600) and the cradle device (200) is broadcast audio data, the execution of the audio sharing mode is performed by both the mobile terminal (600) and the cradle device (200).

[0268] Figures 11a to 11c illustrate various examples of the operation of a wireless audio receiving device and a wireless audio transmitting device.

[0269] First, FIG. 11a illustrates an example of a connection between a wireless audio transmitting device and a wireless audio receiving device.

[0270] Referring to the drawings, a wireless audio receiving device (100a) according to one embodiment of the present disclosure includes a first receiving device (100a1) that receives an audio signal of a first channel from a wireless audio transmitting device (50), and a second receiving device (100a2) that receives an audio signal of a second channel from the wireless audio transmitting device (50).

[0271] That is, the first receiving device (100a1) may be a first wireless audio receiving device, and the second receiving device (100a2) may be a second wireless audio receiving device.

[0272] Meanwhile, the first receiving device (100a1) and the second receiving device (100a2) may include, as illustrated in FIG. 2a, a communication device (135) having a first communication module (135a) and a second communication module (135b), a sensing unit (130), a memory (140), a sound output device (160), a processor (170), an input unit (185), and a power supply unit (190), respectively.

[0273] Meanwhile, the first receiving device (100a1) and the second receiving device (100a2) may be wireless audio receiving devices based on True Wireless Stereo (TWS).

[0274] Meanwhile, the first receiving device (100a1) may be a master receiving device, and the second receiving device (100a2) may be a slave receiving device.

[0275] Meanwhile, the first receiving device (100a1), which is a master receiving device, can transmit or receive packet data by maintaining a data link with the wireless audio transmitting device (50).

[0276] For example, the first receiving device (100a1) can receive a first audio signal from the wireless audio transmitting device (50) while maintaining a data link with the wireless audio transmitting device (50) and output a first sound corresponding to the received first audio signal.

[0277] Meanwhile, the second receiving device (100a2), which is a slave receiving device, can receive packet data from the wireless audio transmission device (50).

[0278] For example, the second receiving device (100a2) can receive a second audio signal from the wireless audio transmitting device (50) and output a second sound corresponding to the received second audio signal.

[0279] Accordingly, the first receiving device (100a1) and the second receiving device (100a2) can implement True Wireless Stereo (TWS).

[0280] Meanwhile, the first receiving device (100a1), which is a master receiving device, can establish or maintain a call link when a call link is required while maintaining a data link with the wireless audio transmission device (50). Accordingly, a call link can be stably established or maintained.

[0281] That is, the first receiving device (100a1), which is a master receiving device, can open a call link while maintaining a data link and transmit packet data corresponding to an audio signal from a microphone (187) to a wireless audio transmission device (50).

[0282] Meanwhile, the data link between the first receiving device (100a1) and the wireless audio transmitting device (50) may be an asynchronous connection less (ACL) link.

[0283] Meanwhile, the call link between the first receiving device (100a1) and the wireless audio transmitting device (50) may be a synchronous connection-oriented (SCO) link, an eSCO link, or a connected isochronous stream (CIS) link.

[0284] Next, FIG. 11b illustrates another example of a connection between a wireless audio transmitting device and a wireless audio receiving device.

[0285] Referring to the drawing, the first receiving device (100a1), which is a master receiving device, can move away from the wireless audio transmitting device (50) while maintaining a data link and a call link with the wireless audio transmitting device (50).

[0286] In the drawing, the distance between the first receiving device (100a1) and the wireless audio transmitting device (50) is exemplified as being greater than the distance between the second receiving device (100a2) and the wireless audio transmitting device (50). In this case, microphone path switching becomes necessary.

[0287] That is, when the distance between the first receiving device (100a1) and the wireless audio transmitting device (50) is greater than the distance between the second receiving device (100a2) and the wireless audio transmitting device (50), a microphone pass switching from the first receiving device (100a1) to the second receiving device (100a2) is required.

[0288] Next, FIG. 11c illustrates another example of a connection between a wireless audio transmitting device and a wireless audio receiving device.

[0289] Referring to the drawing, it is illustrated that only the second receiving device (100a2) is connected to the wireless audio transmitting device (50) without the first receiving device (100a1) which is the master receiving device, and receives an audio signal from the wireless audio transmitting device (50).

[0290] In this case, a microphone path switch from the first receiving device (100a1) to the second receiving device (100a2) is required. Furthermore, a data link switch from the first receiving device (100a1) to the second receiving device (100a2) is required.

[0291] FIG. 12 is a diagram illustrating the operation of a wireless audio receiving device related to the present disclosure.

[0292] Referring to the drawings, a wireless audio transmission device (50x) related to the present disclosure can perform a role handover based on a fast role switch when switching a microphone path from a first receiving device (100a1x) to a second receiving device (100a2x).

[0293] Alternatively, the wireless audio transmission device (50x) related to the present disclosure may perform a role change when switching the microphone path from the first receiving device (100a1x) to the second receiving device (100a2x).

[0294] Accordingly, the data link and call link between the first receiving device (100a1x) and the wireless audio transmitting device (50x) can be released, and the data link and call link between the second receiving device (100a2x) and the wireless audio transmitting device (50x) can be established.

[0295] However, since a fast role switch or role change must be performed between the first receiving device (100a1x) and the second receiving device (100a2x) to switch the data link and the call link, there is a disadvantage in that transmission packet loss occurs and seamless path switching is difficult.

[0296] In this disclosure, we propose a method for reducing delay and packet loss caused by microphone switching in multiple wireless receivers. In particular, we propose a method for seamlessly performing packet transmission through microphone switching. This is described in detail with reference to FIG. 13a and below.

[0297] FIG. 13a is a flowchart illustrating an operation method of a wireless audio output system according to one embodiment of the present disclosure.

[0298] Referring to the drawing, the wireless audio transmission device (50) within the wireless audio output system (10) maintains a data link with the first receiving device (100a1), which is a master device within the wireless audio receiving device (100a) (S1304).

[0299] In response to this, the first receiving device (100a1) within the wireless audio receiving device (100a) maintains a data link with the wireless audio receiving device (100a) (S1305).

[0300] The data link at this time may be an asynchronous connection less (ACL) link.

[0301] In particular, the second communication module (135a) within the first receiving device (100a1) can maintain a data link based on the Bluetooth communication standard, which is an example of the first communication standard.

[0302] Next, the first receiving device (100a1) can determine whether a call link is required (S1310).

[0303] For example, the second communication module (135a) within the first receiving device (100a1) may determine that a call link is required when a call mode is performed.

[0304] Next, the first receiving device (100a1) can establish or maintain a call link if a call link is required (S1313).

[0305] In response to this, the wireless audio transmission device (50) can maintain a call link with the first receiving device (100a1) (S1314).

[0306] Next, the first receiving device (100a1) can transmit the first packet data based on the first microphone to the wireless audio transmitting device (50) through the maintained call link (S1320).

[0307] In response to this, the wireless audio transmission device (50) can receive the first packet data based on the first microphone from the first receiving device (100a1) (S1321).

[0308] Next, the first receiving device (100a1) can determine whether microphone pass switching is required (S1325).

[0309] For example, the first receiving device (100a1) can determine whether microphone path switching is necessary based on the strength (RSSI) of the received wireless signal, as in the case of FIG. 11b or FIG. 11c.

[0310] As another example, the first receiving device (100a1) may determine that microphone path switching is necessary when there is a microphone path switching input through the input unit (165) or the like.

[0311] Next, the first receiving device (100a1) can transmit a microphone pass switching request message to the second receiving device (100a2) when a microphone pass switching is required (S1330).

[0312] In response to this, the second receiving device (100a2) can receive a microphone pass switching request message from the first receiving device (100a1) (S1331).

[0313] The second receiving device (100a2) can transmit an acknowledgement (ACK) response message to the first receiving device (100a1) after receiving a microphone pass switching request message (S1335).

[0314] In response to this, the first receiving device (100a1) can receive a confirmation response message from the second receiving device (100a2) (S1336).

[0315] And, after receiving the confirmation response message, the first receiving device (100a1) can stop transmitting the first packet data based on the first microphone while maintaining the data link as is (S1340).

[0316] That is, after receiving the confirmation response message, the first receiving device (100a1) can release only the call link while maintaining the data link.

[0317] Meanwhile, the second receiving device (100a2) can transmit second packet data based on the second microphone to the wireless audio transmission device (50) based on the microphone pass switching request message (S1345).

[0318] In response to this, the wireless audio transmission device (50) can receive second microphone-based second packet data from the second receiving device (100a2) (S1346).

[0319] For example, the second receiving device (100a2) may establish or maintain a second call link with the wireless audio transmitting device (50) based on a microphone pass switching request message, and transmit second packet data based on a second microphone corresponding to an audio signal from a microphone within the second receiving device (100a2) to the wireless audio transmitting device (50) through the second call link.

[0320] Accordingly, delay and packet loss due to microphone switching in multiple wireless receiving devices can be reduced.

[0321] That is, by switching only the call link, rather than switching the data link and call link based on the fast roll switch or roll change described in the description of Fig. 12, delay and packet loss due to microphone switching can be reduced. In particular, packet transmission due to microphone switching can be performed seamlessly through the second receiving device (100a2).

[0322] FIG. 13b is a flowchart illustrating an operation method of a wireless audio output system according to another embodiment of the present disclosure.

[0323] Referring to the drawing, the wireless audio transmission device (50) within the wireless audio output system (10) maintains a data link with the first receiving device (100a1), which is a master device within the wireless audio receiving device (100a) (S1304).

[0324] In response to this, the first receiving device (100a1) within the wireless audio receiving device (100a) maintains a data link with the wireless audio receiving device (100a) (S1305).

[0325] Next, the first receiving device (100a1) determines whether a call link is required (S1310), and if a call link is required, it can open or maintain a call link while maintaining a data link (S1313).

[0326] In response to this, the wireless audio transmission device (50) can maintain a call link with the first receiving device (100a1) (S1314).

[0327] Next, the first receiving device (100a1) can transmit the first packet data based on the first microphone to the wireless audio transmitting device (50) through the maintained call link (S1320).

[0328] In response to this, the wireless audio transmission device (50) can receive the first packet data based on the first microphone from the first receiving device (100a1) (S1321).

[0329] Next, the second receiving device (100a2) determines whether a microphone path switch is required (S1324), and if so, can transmit a microphone path switch required message to the first receiving device (100a1) (S1328).

[0330] In response to this, the first receiving device (100a1) can receive a microphone pass switching required message from the second receiving device (100a2) (S1329).

[0331] Next, after receiving a microphone pass switching requirement message, the first receiving device (100a1) can transmit a microphone pass switching request message to the second receiving device (100a2) based on the microphone pass switching requirement (S1330).

[0332] In response to this, the second receiving device (100a2) can receive a microphone pass switching request message from the first receiving device (100a1) (S1331).

[0333] The second receiving device (100a2) can transmit an acknowledgement (ACK) response message to the first receiving device (100a1) after receiving a microphone pass switching request message (S1335).

[0334] In response to this, the first receiving device (100a1) can receive a confirmation response message from the second receiving device (100a2) (S1336).

[0335] And, after receiving the confirmation response message, the first receiving device (100a1) can stop transmitting the first packet data based on the first microphone while maintaining the data link as is (S1340).

[0336] That is, after receiving the confirmation response message, the first receiving device (100a1) can release only the call link while maintaining the data link.

[0337] Meanwhile, the second receiving device (100a2) can transmit second packet data based on the second microphone to the wireless audio transmission device (50) based on the microphone pass switching request message (S1345).

[0338] In response to this, the wireless audio transmission device (50) can receive second microphone-based second packet data from the second receiving device (100a2) (S1346).

[0339] For example, the second receiving device (100a2) may establish or maintain a second call link with the wireless audio transmitting device (50) based on a microphone pass switching request message, and transmit second packet data based on a second microphone corresponding to an audio signal from a microphone within the second receiving device (100a2) to the wireless audio transmitting device (50) through the second call link.

[0340] Accordingly, delay and packet loss due to microphone switching in multiple wireless receiving devices can be reduced. In particular, packet transmission due to microphone switching can be performed seamlessly through the second receiving device (100a2).

[0341] Figures 14a to 16 are drawings referenced in the description of Figure 13a or Figure 13b.

[0342] First, FIG. 14a illustrates that a data link (DLK) and a call link (TWK) are maintained between a wireless audio transmission device (50) and a first receiving device (100a1).

[0343] Meanwhile, the second receiving device (100a2) exemplifies that a data link (DLK) and a call link (TWK) are not formed with the wireless audio transmission device (50).

[0344] For example, the first receiving device (100a1) can establish or maintain a call link (TWK) when a call link (TWK) is required while maintaining a data link (DLK) with the wireless audio transmission device (50). Accordingly, the call link (TWK) can be stably established or maintained.

[0345] FIG. 14b illustrates a first receiving device (100a1) transmitting a microphone pass switching request message (MSa) to a second receiving device (100a2) and receiving an acknowledgement message (MSb) from the second receiving device (100a2).

[0346] Referring to the drawing, a first receiving device (100a1) in a wireless audio receiving device (100a) according to one embodiment of the present disclosure transmits first packet data based on a first microphone to a wireless audio transmitting device (50) through a call link (TWK), and, when a microphone path switching is required, transmits a microphone path switching request message (MSa) to a second receiving device (100a2), and stops transmitting the first packet data based on the first microphone while maintaining the data link (DLK).

[0347] Meanwhile, when the second receiving device (100a2) within the wireless audio receiving device (100a) according to one embodiment of the present disclosure receives a microphone path switching request message (MSa), it transmits second packet data based on the second microphone to the wireless audio transmitting device (50). Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices. In particular, packet transmission due to microphone switching can be performed seamlessly through the second receiving device (100a2).

[0348] Meanwhile, the first receiving device (100a1) according to one embodiment of the present disclosure transmits first packet data based on a first microphone to the wireless audio transmitting device (50) through a call link (TWK), and when a microphone path switching is required, transmits a microphone path switching request message (MSa) to the second receiving device (100a2), and when receiving an acknowledgement message (MSb) from the second receiving device (100a2), can stop transmitting the first packet data based on the first microphone while maintaining the data link (DLK).

[0349] That is, when the first receiving device (100a1) receives an acknowledgement message (MSb) from the second receiving device (100a2) after transmitting a microphone path switching request message (MSa) to the second receiving device (100a2), the first receiving device (100a1) can stop transmitting the first packet data based on the first microphone while maintaining the data link (DLK). Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0350] Meanwhile, when the second receiving device (100a2) according to one embodiment of the present disclosure receives a microphone path switching request message (MSa), it can transmit an acknowledgement message (MSb) from the first receiving device (100a1) and transmit second packet data based on the second microphone to the wireless audio transmission device (50). Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0351] FIG. 14c illustrates that a second call link (NTK) is maintained between a wireless audio transmitting device (50) and a second receiving device (100a2).

[0352] Referring to the drawing, when the second receiving device (100a2) receives a microphone pass switching request message (MSa), it can transmit second microphone-based second packet data to the wireless audio transmission device (50) via the second call link (NTK).

[0353] In particular, when the second receiving device (100a2) receives a microphone path switching request message (MSa) while the wireless audio transmitting device (50) and the first receiving device (100a1) maintain a data link (DLK), the second receiving device (100a2) can transmit second packet data based on the second microphone to the wireless audio transmitting device (50) via the second call link (NTK). Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0354] FIG. 14d illustrates that the second receiving device (100a2) transmits a microphone pass switching required message (MSo) to the first receiving device (100a1).

[0355] Referring to the drawings, a second receiving device (100a2) according to another embodiment of the present disclosure transmits a microphone path switching required message (MSo) to the first receiving device (100a1) when a microphone path switching is required while the first receiving device (100a1) is transmitting first packet data based on a first microphone to the wireless audio transmitting device (50) through a call link (TWK).

[0356] And, the second receiving device (100a2) according to another embodiment of the present disclosure transmits second packet data based on the second microphone to the wireless audio transmitting device (50) when receiving a microphone pass switching request message (MSa) from the first receiving device (100a1).

[0357] Meanwhile, when the first receiving device (100a1) receives a microphone path switching required message (MSo) from the second receiving device (100a2), it can transmit a microphone path switching request message (MSa) to the second receiving device (100a2) and stop transmission of the first packet data based on the first microphone while maintaining the data link (DLK).

[0358] Meanwhile, when the second receiving device (100a2) receives a microphone pass switching request message (MSa), it can transmit second packet data based on the second microphone to the wireless audio transmitting device (50).

[0359] In particular, when the second receiving device (100a2) receives a microphone pass switching request message (MSa), it can transmit an acknowledgement message (MSb) from the first receiving device (100a1) and transmit second packet data based on the second microphone to the wireless audio transmission device (50). Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0360] Meanwhile, if the second receiving device (100a2) receives a microphone path switching request message (MSa) after transmitting a microphone path switching required message (MSo) while the wireless audio transmitting device (50) and the first receiving device (100a1) maintain a data link (DLK), the second receiving device (100a2) can transmit second packet data based on the second microphone to the wireless audio transmitting device (50) via the second call link (NTK). Accordingly, delay and packet loss due to microphone switching can be reduced in multiple wireless receiving devices.

[0361] Figure 15a illustrates an example of a microphone pass switch.

[0362] Referring to the drawing, the wireless audio transmission device (50) can maintain a control link for true wireless stereo (TWS) with the first receiving device (100a1) and the second receiving device (100a2) (S1530).

[0363] The control link for true wireless stereo (TWS) at this time may be an ACL link.

[0364] Next, the wireless audio transmission device (50) can maintain a data link for true wireless stereo (TWS) with the host (1512) within the first receiving device (100a1) (S1532).

[0365] Next, the host (1512) and controller (1514) within the first receiving device (100a1) can create a snoop link for true wireless stereo (TWS) with the host (1524) and controller (1522) within the second receiving device (100a2) (S1534).

[0366] Next, the first receiver device (100a1) may attempt to switch the microphone path (ARa) to the second receiver device (100a2).

[0367] Specifically, the host (1512) within the first receiving device (100a1) can transmit a microphone path change command, HCI_EVT_OPCODE_SCO_MIC_PATH_CHANGE_CMD, to the controller (1514) (S1536).

[0368] In response to this, the controller (1514) in the first receiving device (100a1) can transmit HCI_EVENT_COMMAND_STATUS, which is a result of receiving an HCI command, to the host (1512) (S1538).

[0369] Next, the controller (1514) in the first receiving device (100a1) can transmit a microphone path change request message, LMP_OPCODE_LGE_SCO_MIC_PATH_CHANGE_REQ (with bEnable = TRUE), to the controller (1522) in the second receiving device (100a2) (S1540).

[0370] Meanwhile, the controller (1514) in the first receiving device (100a1) can receive a confirmation response message from the second receiving device (100a2) (S1541).

[0371] Next, the controller (1514) in the first receiving device (100a1) can stop transmission of the first microphone-based first packet data to the wireless audio transmission device (50) based on the confirmation response message from the second receiving device (100a2) (S1543).

[0372] That is, the controller (1514) within the first receiving device (100a1) can stop transmission of SCO / eSCO / CIS packets to the wireless audio transmitting device (50).

[0373] At this time, the controller (1514) in the first receiving device (100a1) can maintain the connected ACL packet transmission and reception path.

[0374] Next, if the microphone pass switching to the second receiver device (100a2) is successful, the controller (1514) in the first receiver device (100a1) can transmit the microphone pass stop message HCI_EVENT_COMMAND_COMPLETE to the host (1512) (S1547).

[0375] Meanwhile, when the controller (1522) in the second receiving device (100a2) receives a microphone pass switching request message, it can transmit a confirmation response message to the first receiving device (100a1) and transmit second packet data based on the second microphone to the wireless audio transmission device (50) (S1545).

[0376] That is, the controller (1522) within the second receiving device (100a2) can transmit SCO / eSCO / CIS packets to the wireless audio transmission device (50).

[0377] Next, the controller (1522) within the second receiving device (100a2) can transmit a microphone pass switching success message, HCI_EVENT_COMMAND_COMPLETE, to the host (1524) (S1549).

[0378] Accordingly, delay and packet loss due to microphone switching in multiple wireless receiving devices (100a1, 100a2) can be reduced. In particular, packet transmission due to microphone switching can be performed seamlessly through the second receiving device (100a2).

[0379] Figure 15b illustrates another example of a microphone pass switch.

[0380] Referring to the drawing, the wireless audio transmission device (50) can maintain a control link for true wireless stereo (TWS) with the first receiving device (100a1) and the second receiving device (100a2) (S1530).

[0381] Next, the wireless audio transmission device (50) can maintain a data link for true wireless stereo (TWS) with the host (1512) within the first receiving device (100a1) (S1532).

[0382] Next, the host (1512) and controller (1514) within the first receiving device (100a1) can create a snoop link for true wireless stereo (TWS) with the host (1524) and controller (1522) within the second receiving device (100a2) (S1534).

[0383] Next, the second receiver device (100a2) may attempt to switch the microphone path (ARb) to the first receiver device (100a1).

[0384] Specifically, the host (1512) within the first receiving device (100a1) can transmit a microphone path change command, HCI_EVT_OPCODE_SCO_MIC_PATH_CHANGE_CMD, to the controller (1514) (S1537).

[0385] In response to this, the controller (1514) in the first receiving device (100a1) can transmit HCI_EVENT_COMMAND_STATUS, which is a result of receiving an HCI command, to the host (1512) (S1538).

[0386] Next, the controller (1514) in the first receiving device (100a1) can transmit a microphone path change request message, LMP_OPCODE_LGE_SCO_MIC_PATH_CHANGE_REQ (with bEnable = FALSE), to the controller (1522) in the second receiving device (100a2) (S1539).

[0387] Meanwhile, the controller (1514) in the first receiving device (100a1) can receive a confirmation response message from the second receiving device (100a2) (S1541).

[0388] Next, the controller (1514) in the first receiving device (100a1) can transmit the first packet data based on the first microphone to the wireless audio transmission device (50) based on the confirmation response message from the second receiving device (100a2) (S1543).

[0389] That is, the controller (1514) within the first receiving device (100a1) can transmit SCO / eSCO / CIS packets to the wireless audio transmitting device (50).

[0390] At this time, the controller (1514) in the first receiving device (100a1) can maintain the connected ACL packet transmission and reception path.

[0391] Next, the controller (1514) within the first receiving device (100a1) can transmit a microphone pass switching success message, HCI_EVENT_COMMAND_COMPLETE, to the host (1512) when the microphone pass switching to the first receiving device (100a1) is successful (S1548).

[0392] Meanwhile, when the controller (1522) in the second receiving device (100a2) receives a microphone pass switching request message, it can transmit a confirmation response message to the first receiving device (100a1) and stop transmitting the second packet data based on the second microphone to the wireless audio transmission device (50) (S1546).

[0393] That is, the controller (1522) within the second receiving device (100a2) can stop transmission of SCO / eSCO / CIS packets to the wireless audio transmitting device (50).

[0394] Next, the controller (1522) within the second receiving device (100a2) can transmit a microphone pass stop message, HCI_EVENT_COMMAND_COMPLETE, to the host (1524) (S1550).

[0395] Accordingly, delay and packet loss due to microphone switching in multiple wireless receiving devices (100a1, 100a2) can be reduced. In particular, packet transmission due to microphone switching can be performed seamlessly through the first receiving device (100a1).

[0396] Figure 15c illustrates another example of a microphone pass switch.

[0397] Referring to the drawing, the wireless audio transmission device (50) can maintain a control link for true wireless stereo (TWS) with the first receiving device (100a1) and the second receiving device (100a2) (S1630).

[0398] Next, the wireless audio transmission device (50) can maintain a data link for true wireless stereo (TWS) with the host (1512) within the first receiving device (100a1) (S1632).

[0399] Next, the host (1512) and controller (1514) within the first receiving device (100a1) can create a snoop link for true wireless stereo (TWS) with the host (1524) and controller (1522) within the second receiving device (100a2) (S1634).

[0400] Next, the host (1524) in the second receiving device (100a2) can transmit a microphone path change requirement message, HCI_EVT_OPCODE_SCO_MIC_PATH_CHANGE_CMD, to the controller (1522) (S1642).

[0401] Next, the controller (1522) in the second receiving device (100a2) can transmit HCI_EVENT_COMMAND_STATUS, which is the result of receiving the HCI command, to the host (1524) (S1644).

[0402] Next, the controller (1522) in the second receiving device (100a2) can transmit a microphone path change requirement message, LMP_OPCODE_LGE_SCO_MIC_PATH_CHANGE_REQ (with bEnable = FALSE), to the controller (1514) in the first receiving device (100a1) (S1646).

[0403] Next, the controller (1514) in the first receiving device (100a1) can transmit a microphone path change request message, LMP_OPCODE_LGE_SCO_MIC_PATH_CHANGE_REQ (with bEnable = TRUE), to the controller (1522) in the second receiving device (100a2) (S1654).

[0404] Meanwhile, the controller (1514) in the first receiving device (100a1) can receive a confirmation response message from the second receiving device (100a2) (S1656).

[0405] Next, the controller (1514) in the first receiving device (100a1) can stop transmission of the first microphone-based first packet data to the wireless audio transmission device (50) based on the confirmation response message from the second receiving device (100a2) (S1658).

[0406] That is, the controller (1514) within the first receiving device (100a1) can stop transmission of SCO / eSCO / CIS packets to the wireless audio transmitting device (50).

[0407] At this time, the controller (1514) in the first receiving device (100a1) can maintain the connected ACL packet transmission and reception path.

[0408] Next, if the microphone pass switching to the second receiver device (100a2) is successful, the controller (1514) in the first receiver device (100a1) can transmit the microphone pass stop message HCI_EVENT_COMMAND_COMPLETE to the host (1512) (S1660).

[0409] Meanwhile, when the controller (1522) in the second receiving device (100a2) receives a microphone pass switching request message, it can transmit a confirmation response message to the first receiving device (100a1) and transmit second packet data based on the second microphone to the wireless audio transmission device (50) (S1659).

[0410] That is, the controller (1522) within the second receiving device (100a2) can transmit SCO / eSCO / CIS packets to the wireless audio transmission device (50).

[0411] Next, the controller (1522) in the second receiving device (100a2) can transmit a microphone pass switching success message, HCI_EVENT_COMMAND_COMPLETE, to the host (1524) (S1662).

[0412] Accordingly, delay and packet loss due to microphone switching in multiple wireless receiving devices (100a1, 100a2) can be reduced. In particular, packet transmission due to microphone switching can be performed seamlessly through the second receiving device (100a2).

[0413] Figure 15d illustrates another example of a microphone pass transition.

[0414] Referring to the drawing, the wireless audio transmission device (50) can maintain a control link for true wireless stereo (TWS) with the first receiving device (100a1) and the second receiving device (100a2) (S1630).

[0415] Next, the wireless audio transmission device (50) can maintain a data link for true wireless stereo (TWS) with the host (1512) within the first receiving device (100a1) (S1632).

[0416] Next, the host (1512) and controller (1514) within the first receiving device (100a1) can create a snoop link for true wireless stereo (TWS) with the host (1524) and controller (1522) within the second receiving device (100a2) (S1634).

[0417] Next, the host (1524) in the second receiving device (100a2) can transmit a microphone path change requirement message, HCI_EVT_OPCODE_SCO_MIC_PATH_CHANGE_CMD, to the controller (1522) (S1643).

[0418] Next, the controller (1522) in the second receiving device (100a2) can transmit HCI_EVENT_COMMAND_STATUS, which is the result of receiving the HCI command, to the host (1524) (S1644).

[0419] Next, the controller (1522) in the second receiving device (100a2) can transmit a microphone path change requirement message, LMP_OPCODE_LGE_SCO_MIC_PATH_CHANGE_REQ (with bEnable = TRUE), to the controller (1514) in the first receiving device (100a1) (S1646).

[0420] Next, the controller (1514) in the first receiving device (100a1) can transmit a microphone path change request message, LMP_OPCODE_LGE_SCO_MIC_PATH_CHANGE_REQ (with bEnable = FALSE), to the host (1524) in the second receiving device (100a2) (S1655).

[0421] Meanwhile, the controller (1514) in the first receiving device (100a1) can receive a confirmation response message from the second receiving device (100a2) (S1656).

[0422] Next, the controller (1514) in the first receiving device (100a1) can transmit the first packet data based on the first microphone to the wireless audio transmission device (50) based on the confirmation response message from the second receiving device (100a2) (S1668).

[0423] That is, the controller (1514) within the first receiving device (100a1) can transmit SCO / eSCO / CIS packets to the wireless audio transmitting device (50).

[0424] At this time, the controller (1514) in the first receiving device (100a1) can maintain the connected ACL packet transmission and reception path.

[0425] Next, the controller (1514) within the first receiving device (100a1) can transmit a microphone pass switching success message, HCI_EVENT_COMMAND_COMPLETE, to the host (1512) when the microphone pass switching to the first receiving device (100a1) is successful (S1671).

[0426] Meanwhile, when the controller (1522) in the second receiving device (100a2) receives a microphone pass switching request message, it can transmit a confirmation response message to the first receiving device (100a1) and stop transmitting the second packet data based on the second microphone to the wireless audio transmission device (50) (S1669).

[0427] That is, the controller (1522) within the second receiving device (100a2) can stop transmission of SCO / eSCO / CIS packets to the wireless audio transmitting device (50).

[0428] Next, the controller (1522) within the second receiving device (100a2) can transmit a microphone pass stop message, HCI_EVENT_COMMAND_COMPLETE, to the host (1524) (S1673).

[0429] Accordingly, delay and packet loss due to microphone switching in multiple wireless receiving devices (100a1, 100a2) can be reduced. In particular, packet transmission due to microphone switching can be performed seamlessly through the first receiving device (100a1).

[0430] Fig. 16 is a diagram illustrating a packet or signal between a wireless audio transmission device (50) and a plurality of wireless receiving devices (100a1, 100a2).

[0431] Referring to the drawing, (a) of FIG. 16 illustrates transmission of a microphone pass switching request message (DM1, DM2) between multiple wireless receiving devices (100a1, 100a2).

[0432] In the drawing, it is illustrated that during periods Ta7 and Ta9, microphone pass switching request messages (DM1, DM2) are transmitted between multiple wireless receiving devices (100a1, 100a2).

[0433] Accordingly, until Ta7, the data link and call link are maintained in the first receiving device (100a1), and from Ta11 onwards, the call link can be maintained in the second receiving device (100a2).

[0434] Figure 16 (b) is a drawing illustrating a packet output or input from a wireless audio transmission device (50).

[0435] (c) and (d) of FIG. 16 illustrate examples of the transmission waveform and reception waveform of the first receiving device (100a1), and (e) and (f) of FIG. 16 illustrate examples of the transmission waveform and reception waveform of the second receiving device (100a2).

[0436] Meanwhile, the wireless audio transmission device (50) can transmit wireless audio data (DTam1 to DTam6) at each of the points Ta1, Ta3, Ta5, Ta12, Ta14, and Ta16.

[0437] Accordingly, multiple wireless receiving devices (100a1, 100a2) can each receive wireless audio data (DTam1 to DTam6) and output corresponding sounds.

[0438] Meanwhile, the first receiving device (100a1) can transmit the first packet data (DTmb1) based on the first microphone at time Ta2 through the call link.

[0439] In response to this, the wireless audio transmission device (50) can receive the first packet data (DTmb1) based on the first microphone at time Ta2. Accordingly, a call mode based on the first receiving device (100a1) can be performed.

[0440] Meanwhile, the first receiving device (100a1) can transmit a microphone pass switching request message (DM1, DM2) during periods Ta7 and Ta9.

[0441] At this time, the second receiving device (100a2) can receive a microphone pass switching request message (DM1, DM2).

[0442] Meanwhile, the second receiving device (100a2) can maintain a second call link with the wireless audio transmitting device (50) based on the microphone pass switching request message (DM1, DM2).

[0443] For example, the second receiving device (100a2) can transmit second microphone-based second packet data (DTmb2) at time Ta13 through the second call link.

[0444] In response to this, the wireless audio transmission device (50) can receive second packet data (DTmb2) based on the second microphone at time Ta13. Accordingly, a call mode based on the second receiving device (100a2) can be performed.

[0445] According to FIG. 16, delay and packet loss due to microphone switching in multiple wireless receiving devices (100a1, 100a2) can be reduced. In particular, packet transmission due to microphone switching can be performed seamlessly through the second receiving device (100a2).

[0446] Meanwhile, FIGS. 11a to 16 illustrate a mobile terminal as an example of a wireless audio transmission device (50), but the present invention is not limited thereto, and a cradle device (200) is also possible.

[0447] Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the present invention pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present disclosure.

Claims

1. A first receiving device that receives an audio signal of a first channel from a wireless audio transmitting device; A second receiving device for receiving an audio signal of a second channel from the wireless audio transmitting device; The above first receiving device, Through the call link with the wireless audio transmission device, transmit first packet data based on a first microphone to the wireless audio transmission device, and when a microphone pass switching is required, transmit a microphone pass switching request message to the second receiving device, and stop transmitting the first packet data based on the first microphone while maintaining the data link. The second receiving device, A wireless audio receiving device that transmits second packet data based on a second microphone to the wireless audio transmitting device when receiving the above microphone pass switching request message.

2. In paragraph 1, The second receiving device, A wireless audio receiving device that, when receiving the above microphone pass switching request message, transmits a confirmation response message from the first receiving device and transmits second packet data based on the second microphone to the wireless audio transmitting device.

3. In paragraph 1, The second receiving device, A wireless audio receiving device that, when receiving the above microphone pass switching request message, transmits second packet data based on the second microphone to the wireless audio transmitting device through a second call link.

4. In paragraph 1, The above first receiving device, A wireless audio receiving device that transmits first packet data based on the first microphone to the wireless audio transmitting device through the call link, transmits a microphone path switching request message to the second receiving device when the microphone path switching is required, and stops transmitting the first packet data based on the first microphone while maintaining the data link when receiving an acknowledgement message from the second receiving device.

5. In paragraph 1, The above first receiving device, A wireless audio receiving device that, while maintaining a data link with the wireless audio transmitting device, establishes or maintains the call link when the call link is required.

6. In paragraph 3, The second receiving device, A wireless audio receiving device that, when receiving the microphone pass switching request message while the wireless audio transmitting device and the first receiving device maintain a data link, transmits second packet data based on the second microphone to the wireless audio transmitting device through the second call link.

7. In paragraph 1, The second receiving device, A wireless audio receiving device, wherein, when a microphone path switching is required while the first receiving device is transmitting the first packet data based on the first microphone to the wireless audio transmitting device through the call link, the first receiving device transmits a microphone path switching required message to the first receiving device.

8. In paragraph 7, The above first receiving device, When the microphone pass switching required message is received from the second receiving device, a microphone pass switching request message is transmitted to the second receiving device, and transmission of the first packet data based on the first microphone is stopped while maintaining the data link. The second receiving device, A wireless audio receiving device that, when receiving the above microphone pass switching request message, transmits second packet data based on the second microphone to the wireless audio transmitting device.

9. In paragraph 8, The second receiving device, A wireless audio receiving device that, when receiving the above microphone pass switching request message, transmits a confirmation response message from the first receiving device and transmits second packet data based on the second microphone to the wireless audio transmitting device.

10. In paragraph 8, The second receiving device, A wireless audio receiving device that, when receiving the above microphone pass switching request message, transmits second packet data based on the second microphone to the wireless audio transmitting device through a second call link.

11. In paragraph 8, The above first receiving device, A wireless audio receiving device that, after transmitting a microphone pass switching request message to the second receiving device, stops transmitting the first packet data based on the first microphone while maintaining the data link when receiving an acknowledgement message from the second receiving device.

12. In paragraph 8, The above first receiving device, A wireless audio receiving device that, while maintaining a data link with the wireless audio transmitting device, establishes or maintains the call link when the call link is required.

13. In paragraph 10, The second receiving device, A wireless audio receiving device that, when receiving the microphone pass switching request message while the wireless audio transmitting device and the first receiving device maintain a data link, transmits second packet data based on the second microphone to the wireless audio transmitting device through the second call link.

14. A first receiving device for receiving an audio signal of a first channel from a wireless audio transmitting device; A second receiving device for receiving an audio signal of a second channel from the wireless audio transmitting device; The second receiving device, When the first receiving device transmits the first packet data based on the first microphone to the wireless audio transmitting device through the call link, if a microphone path switching is required, the first receiving device transmits a microphone path switching required message to the first receiving device. A wireless audio receiving device that transmits second packet data based on the second microphone to the wireless audio transmitting device when receiving a microphone pass switching request message from the first receiving device.

15. In paragraph 14, The above first receiving device, A wireless audio receiving device that, when receiving the microphone pass switching requirement message from the second receiving device, transmits a microphone pass switching request message to the second receiving device and stops transmitting the first packet data based on the first microphone while maintaining the data link.

16. In paragraph 14, The second receiving device, A wireless audio receiving device that, when receiving the above microphone pass switching request message, transmits a confirmation response message from the first receiving device and transmits second packet data based on the second microphone to the wireless audio transmitting device.

17. In paragraph 14, The second receiving device, A wireless audio receiving device that, when receiving the above microphone pass switching request message, transmits second packet data based on the second microphone to the wireless audio transmitting device through a second call link.

18. In paragraph 17, The above first receiving device, A wireless audio receiving device that, after transmitting a microphone pass switching request message to the second receiving device, stops transmitting the first packet data based on the first microphone while maintaining the data link when receiving an acknowledgement message from the second receiving device.

19. In paragraph 14, The above first receiving device, A wireless audio receiving device that, while maintaining a data link with the wireless audio transmitting device, establishes or maintains the call link when the call link is required.

20. A wireless audio receiving device according to any one of claims 1 to 19; A wireless audio output system comprising a wireless audio transmission device.

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