Wearable device modular audio system

Abstract

The present invention relates to a modular audio system for a wearable device, which includes a wearable device body and an audio module. The wearable device body has a central control module, a Hall module, an output interface, and a metal part provided on the output interface. The audio module has an input interface and a magnetic part provided on the input interface. When the magnetic part and the metal part are magnetically connected, the output interface is signal-transmission connected to the input interface. The Hall module is signal-control connected to the central control module, and when the Hall device of the Hall module senses the magnetic field signal of the magnetic part, it will output an interrupt signal to the central control module. The central control module switches the wearable device body to the corresponding working mode according to the received interrupt signal, and sends the corresponding audio control signal to the audio module through the output interface and the input interface. The audio module performs corresponding audio work according to the received audio control signal. The modular audio system for the wearable device designed by the present invention can be combined and split according to user needs without affecting the functions of the wearable device itself, effectively improving the user experience, and having low product cost and strong flexibility.

Description

Technical Field

[0001] The present invention relates to the technical field of wearable devices, and particularly to a modular audio system for wearable devices. Background Art

[0002] With the development of wearable device technology, wearable devices such as smart bracelets, smart watches, and smart glasses can already implement functions such as phone calls and music. The existing smart watches and smart bracelets have a very wide range of usage scenarios, and can provide users with a full range of services such as health management, sports monitoring, communication services, music entertainment, navigation services, and payment functions. As consumers' usage requirements continue to change, the functions built into wearable devices are also constantly changing. Generally speaking, while wearable devices meet users' diverse usage requirements, they also require lower power consumption and a smaller structure to enhance the user experience.

[0003] However, due to volume limitations, the battery unit capacity of existing wearable devices cannot be made very large. When used in scenarios such as phone calls and music, the relatively small battery capacity often limits the usage time of wearable devices in these scenarios. In addition, due to the overall size of existing wearable devices, the speakers on them are generally made relatively small, and in order to reduce the power consumption when using the speakers, the speaker power inside is also relatively small. This results in the disadvantages of low call volume and short sound propagation distance in music playback and voice call scenarios of wearable devices, and in a noisy environment, the sound emitted by the wearable device cannot even be heard. Therefore, existing wearable devices have many deficiencies in many usage scenarios. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a modular audio system for wearable devices that can be combined and split according to user needs without affecting the functions of the wearable device itself, effectively improving the user experience, having a low product cost, and strong flexibility.

[0005] To achieve the above object, the modular audio system of the wearable device designed by the present invention includes a wearable device body and an audio module. The wearable device body has a central control module, a Hall module, an output interface, and a metal part provided on the output interface. The audio module has an input interface and a magnetic part provided on the input interface. When the magnetic part and the metal part are magnetically connected, the output interface is signal-transmission connected to the input interface. The Hall module is signal-control connected to the central control module. When the Hall device of the Hall module senses the magnetic field signal of the magnetic part, it will output an interrupt signal to the central control module. The central control module switches the wearable device body to the corresponding working mode according to the received interrupt signal, and sends the corresponding audio control signal to the audio module through the output interface and the input interface. The audio module performs corresponding audio work according to the received audio control signal.

[0006] A further solution is that the audio module includes a speaker module, an audio power amplifier, and a battery module. The speaker module is used to play sound. The audio power amplifier is used to amplify the audio differential signal. The battery module is used to supply power to the audio power amplifier.

[0007] A further solution is that the wearable device body includes a first audio switch, a second audio switch, a third audio switch, a built-in speaker module, and a built-in earphone module, as well as a pull-down resistor R1, a pull-down resistor R2, and a pull-down resistor R3. The first audio switch, the second audio switch, and the third audio switch are used to select and connect the audio signal connection mode of the wearable device body in different working modes. The built-in speaker module is used to play sound when the wearable device body is not connected to the audio module. The built-in earphone module is used to listen to call sounds when the wearable device body is not connected to the audio module. The pull-down resistor R1 = the pull-down resistor R2 = the pull-down resistor R3 = 4.7k. The central control module includes an audio output module AUDIO OUT and a GPIO control module.

[0008] A further solution is that when the wearable device body is not connected to the audio module, under the action of the pull-down resistor R2, the selection signal SEL6 of the audio switch connects the left-channel OUTP and right-channel OUTN signals of the speaker output of the audio output module AUDIO OUT to the left-channel signal OUTP1 and right-channel signal OUTN1 of the built-in speaker module respectively, so that the built-in speaker module plays music. Under the action of the pull-down resistor R3, the selection signal SEL8 of the third audio switch connects the left-channel RCRP and right-channel RCRN signals of the earphone output of the audio output module AUDIO OUT to the left-channel signal RCRP1 and right-channel signal RCRN1 of the earphone module respectively, so that the earphone module plays call sounds.

[0009] A further solution is that the input interface includes an INP speaker input signal pin, an INN speaker input signal pin, a PWM control input signal pin, and a first GND signal pin, the output interface includes an INP speaker output signal pin, an INN speaker output signal pin, a PWM control output signal pin, and a second GND signal pin. When the magnetic part and the metal part are magnetically connected, the INP speaker input signal pin is connected to the INP speaker output signal pin, the INN speaker input signal pin is connected to the INN speaker output signal pin, the PWM control input signal pin is connected to the PWM control output signal pin, and the first GND signal pin is connected to the second GND signal pin.

[0010] A further solution is that the audio module is connected to the wearable device body, and when the selection signal SEL6 of the second audio switch is high level and the selection signal SEL5 of the first audio switch is low level, the left-channel OUTP and right-channel OUTN signals of the speaker output of the audio output module AUDIO OUT are respectively connected to the left-channel signal OUTP0 and right-channel signal OUTN0 of the first audio switch. The left-channel signal OUTP0 and right-channel signal OUTN0 of the first audio switch are respectively connected to the INP speaker output signal pin and the INN speaker output signal pin, so that the left-channel OUTP and right-channel OUTN signals of the speaker output of the audio output module AUDIO OUT are respectively input into the audio power amplifier through the INP speaker input signal pin and the INN speaker input signal pin, and the signals VOP and VON amplified by the audio power amplifier drive the external speaker, so that the external speaker plays music with greater power.

[0011] A further solution is that the audio module is connected to the wearable device body, and when the selection signal SEL8 of the third audio switch is high level and the selection signal SEL5 of the first audio switch is high level, the left-channel RCRP and right-channel RCRN signals of the receiver output of the audio output module AUDIO OUT are respectively connected to the left-channel RCRP0 and right-channel RCRN0 signals of the first audio switch after passing through the third audio switch. The left-channel RCRP0 and receiver right-channel RCRN0 signals of the first audio switch are respectively connected to the INP speaker output signal pin and the INN speaker output signal pin, so that the left-channel RCRP and right-channel RCRN signals of the receiver output of the audio output module AUDIOOUT are respectively input into the audio power amplifier through the INP speaker input signal pin and the INN speaker input signal pin, and the signals VOP and VON amplified by the audio power amplifier drive the external speaker, so that the external speaker plays the call sound.

[0012] A further solution is that the chip model adopted by the central control module is MT6725, and the chip model adopted by the Hall module is APX9136QFI-TRG.

[0013] A further solution is that the chip model adopted by the audio power amplifier is AW8736.

[0014] A further solution is that the chip models adopted by the first audio switch, the second audio switch, and the third audio switch are WAS4729QB.

[0015] The modular audio system of the wearable device designed by the present invention can be combined and split according to user needs without affecting the functions of the wearable device itself, effectively improving the user experience, and having low product cost and strong flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the application block diagram of Embodiment 1;

[0017] Figure 2 is the block diagram of the output interface and the input interface in Embodiment 1;

[0018] Figure 3 is the circuit diagram of the connection between the wearable device body and the audio module in Embodiment 1.

[0019] Wherein: wearable device body 100, output interface 101, INP speaker output signal pin B2, INN speaker output signal pin B3, PWM control output signal pin B4, second GND signal pin B5, metal part 102, audio module 200, input interface 201, INP speaker input signal pin A2, INN speaker input signal pin A3, PWM control input signal pin A4, first GND signal pin A5, magnetic part 202, speaker module U1, audio power amplifier U2, battery module U4, first audio switch U5, second audio switch U6, built-in earphone module U7, third audio switch U8, central control module U9, Hall module U10, built-in speaker module U11. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0021] Embodiment 1.

[0022] As Figures 1 - 3As shown in the figure, the modular audio system of the wearable device described in this embodiment includes a wearable device body 100 and an audio module 200. The wearable device body 100 has a central control module U9, a Hall module U10, an output interface 101, and a metal part 102 provided on the output interface 101. The audio module 200 has an input interface 201 and a magnetic part 202 provided on the input interface 201. When the magnetic part 202 is magnetically connected to the metal part 102, the output interface 101 is signal-transmission connected to the input interface 201. The Hall module U10 is signal-control connected to the central control module U9. When the Hall device of the Hall module U10 senses the magnetic field signal of the magnetic part 202, it will output an interrupt signal to the central control module U9. The central control module U9 switches the wearable device body 100 to the corresponding working mode according to the received interrupt signal, and sends the corresponding audio control signal to the audio module 200 through the output interface 101 and the input interface 201. The audio module 200 performs corresponding audio work according to the received audio control signal. In this embodiment, the wearable device body 100 can be an electronic wearable device such as a smart bracelet or a smart watch. Here, the application scenario of a smart watch is taken as an example for illustration. For example, Figure 1As shown, when the wearable device body 100 needs to be connected to the audio module 200, the audio module 200 is brought close to the wearable device, and the audio module 200 is fixed on the wearable device body 100 by magnetically connecting the magnetic part 202 and the metal part 102. At this time, the Hall module U10 in the wearable device body 100 senses the magnetic field of the magnetic part 202, and the Hall interrupt signal HALL_INT of the Hall module U10 is changed from the original high level to the low level and transmitted to the central control module U9, and then the wearable device body 100 is switched to the corresponding music playback mode, and the corresponding audio control signal is sent to the audio module 200 to control the audio module 200 to play music, so as to meet the audio needs of the wearable device body 100 in different scenarios. By using the above-mentioned structural design, the audio module 200 is modularized and connected through the magnetic part without affecting the function of the wearable device itself and increasing the volume of the wearable device. The magnetic connection between 202 and the metal part 102 realizes the rapid connection and disconnection between the audio module 200 and the wearable device body 100, so that the user can add or remove the audio module 200 at any time according to the needs, which is more flexible and effectively improves the user experience. Moreover, the connection method of the audio module 200 and the wearable device body 100 provided in this embodiment saves the user from a series of steps of matching the external Bluetooth device through the wearable device body 100, compared with the traditional connection method of the Bluetooth device and the wearable device body 100, but directly combines and splits the audio module 200 and the wearable device body 100 through physical connection according to the needs. The steps are simple and easy to understand, which brings a more obvious improvement to the user experience of children. In addition, this connection method has good anti-interference effect and can effectively reduce the influence of the external environment on the connection stability between the audio module 200 and the wearable device body 100. In this embodiment, the chip model used by the central control module U9 is MT6725, and the chip model used by the Hall module U10 is APX9136QFI-TRG.

[0023] Specifically, Figure 3As shown, the audio module 200 includes a speaker module U1, an audio power amplifier U2, and a battery module U4. The speaker module U1 is used to play sounds, the audio power amplifier U2 is used to amplify audio differential signals, and the battery module U4 is used to supply power to the audio power amplifier U2. This modular design makes the audio module 200 more flexible, allowing it to be combined and disassembled according to actual needs, facilitating the realization of different functions and adaptation to different application scenarios. Additionally, using the battery module U4 to supply power to the audio power amplifier U2 solves the problem of the small battery capacity of existing wearable devices, enabling the audio module 200 to use high-power speakers, and solving the disadvantages of low sound volume, short battery life, and short sound propagation distance in music playback and voice call scenarios of existing wearable devices. That is, it effectively improves the battery life of the wearable device body 100 in scenarios such as music and calls, enhancing the user experience. In this embodiment, the battery module U4 is preferably a small lithium battery that can be replaced or charged. In this embodiment, the chip model used for the audio power amplifier U2 is AW8736.

[0024] In some embodiments of the present invention, as Figure 3 shown, the wearable device body 100 includes a first audio switch U5, a second audio switch U6, a third audio switch U8, a built-in speaker module U11, and a built-in earpiece module U7, as well as pull-down resistors R1, R2, and R3. The first audio switch U5, the second audio switch U6, and the third audio switch U8 are used to select and connect the audio signal connection mode of the wearable device body 100 in different working modes. The built-in speaker module U11 is used to play sounds when the wearable device body 100 is not connected to the audio module 200, and the built-in earpiece module U7 is used to listen to call sounds when the wearable device body 100 is not connected to the audio module 200. The pull-down resistor R1 = pull-down resistor R2 = pull-down resistor R3 = 4.7k. The central control module U9 includes an audio output module AUDIO OUT and a GPIO control module to ensure the normal use of the functions of the wearable device body 100 itself. In this embodiment, the chip models used for the first audio switch U5, the second audio switch U6, and the third audio switch U8 are WAS4729QB, and the chip parameters of this model need to meet a -3dBBandwidth of 80MHz and a High Off isolation of -81dB@1KHz.

[0025] Specifically, as Figure 3As shown, when the wearable device body 100 is not connected to the audio module 200, under the action of the pull-down resistor R2, the selection signal SEL6 of the audio switch U6 causes the left-channel OUTP and right-channel OUTN signals of the speaker output of the audio output module AUDIO OUT to be connected to the left-channel signal OUTP1 and right-channel signal OUTN1 of the built-in speaker module U11 respectively, so that the built-in speaker module U11 plays music; under the action of the pull-down resistor R3, the selection signal SEL8 of the third audio switch U8 causes the left-channel RCRP and right-channel RCRN signals of the handset output of the audio output module AUDIO OUT to be connected to the left-channel signal RCRP1 and right-channel signal RCRN1 of the handset module U7 respectively, so that the handset module U7 plays the call sound. This ensures the normal use of each function of the wearable device body 100 when it is not connected to the audio module 200.

[0026] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, the input interface 201 includes an INP speaker input signal pin A2, an INN speaker input signal pin A3, a PWM control input signal pin A4, and a first GND signal pin A5, and the output interface 101 includes an INP speaker output signal pin B2, an INN speaker output signal pin B3, a PWM control output signal pin B4, and a second GND signal pin B5. When the magnetic member 202 and the metal member 102 are magnetically connected, the INP speaker input signal pin A2 is connected to the INP speaker output signal pin B2, the INN speaker input signal pin A3 is connected to the INN speaker output signal pin B3, the PWM control input signal pin A4 is connected to the PWM control output signal pin B4, and the first GND signal pin A5 is connected to the second GND signal pin B5. In this way, through the corresponding connection of the input interface 201 and the output interface 101, the speaker input signal of the audio module 200 can be correctly connected to the speaker output signal of the wearable device body 100. The audio power amplifier U2 amplifies the audio differential signal input to the INP speaker input signal pin A2 and the INN speaker input signal pin A3 to drive the speaker module U1 to sound, and the audio control signal of the wearable device body 100 can also be correctly transmitted to the audio module 200. In this embodiment, two magnetic members 202 and two metal members 102 are provided to ensure the stability and reliability of the connection between the audio module 200 and the wearable device body 100.

[0027] In some embodiments of the present invention, as Figure 3As shown, the audio module 200 is connected to the wearable device body 100. When the gating signal SEL6 of the second audio switch U6 is at a high level and the gating signal SEL5 of the first audio switch U5 is at a low level, the left-channel OUTP and right-channel OUTN signals output by the speaker of the audio output module AUDIO OUT are respectively connected to the left-channel signal OUTP0 and right-channel signal OUTN0 of the first audio switch U5. The left-channel signal OUTP0 and right-channel signal OUTN0 of the first audio switch U5 are respectively connected to the INP speaker output signal pin B2 and INN speaker output signal pin B3, so that the left-channel OUTP and right-channel OUTN signals output by the speaker of the audio output module AUDIO OUT are respectively input into the audio power amplifier U2 through the INP speaker input signal pin A2 and INN speaker input signal pin A3, and the signals VOP and VON amplified by the audio power amplifier U2 drive the external speaker U1, so that the external speaker U1 plays music with a greater power.

[0028] In some embodiments of the present invention, as Figure 3 As shown, the audio module 200 is connected to the wearable device body 100. When the gating signal SEL8 of the third audio switch U8 is at a high level and the gating signal SEL5 of the first audio switch U5 is at a high level, the left-channel RCRP and right-channel RCRN signals output by the earpiece of the audio output module AUDIO OUT are respectively connected to the left-channel RCRP0 and right-channel RCRN0 signals of the first audio switch U5 after passing through the third audio switch U8. The left-channel RCRP0 and right-channel RCRN0 signals of the earpiece of the first audio switch U5 are respectively connected to the INP speaker output signal pin B2 and INN speaker output signal pin B3, so that the left-channel RCRP and right-channel RCRN signals output by the earpiece of the audio output module AUDIO OUT are respectively input into the audio power amplifier U2 through the INP speaker input signal pin A2 and INN speaker input signal pin A3, and the signals VOP and VON amplified by the audio power amplifier U2 drive the external speaker U1, so that the external speaker U1 plays the call sound.

[0029] The modular audio system of the wearable device provided in this embodiment can be combined and split according to the user's needs without affecting the functions of the wearable device itself, effectively improving the user experience, and having a low product cost and strong flexibility.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A modular audio system for a wearable device, comprising a wearable device body (100) and an audio module (200), characterized in that, The wearable device body (100) has a central control module (U9), a Hall module (U10), an output interface (101), and a metal part (102) provided on the output interface (101). The audio module (200) has an input interface (201) and a magnetic part (202) provided on the input interface (201). When the magnetic part (202) and the metal part (102) are magnetically connected, the output interface (101) is signal-transmission connected to the input interface (201). The Hall module (U10) is signal-controlled connected to the central control module (U9). And when the Hall device of the Hall module (U10) senses the magnetic field signal of the magnetic part (202), it will output an interrupt signal to the central control module (U9). The central control module (U9) switches the wearable device body (100) to the corresponding working mode according to the received interrupt signal, and sends the corresponding audio control signal to the audio module (200) through the output interface (101) and the input interface (201). The audio module (200) performs corresponding audio work according to the received audio control signal. The audio module (200) includes a speaker module (U1), an audio power amplifier (U2), and a battery module (U4). The speaker module (U1) is used to play sound. The audio power amplifier (U2) is used to amplify the audio differential signal. The battery module (U4) is used to supply power to the audio power amplifier (U2). The wearable device body (100) includes a first audio switch (U5), a second audio switch (U6), a third audio switch (U8), a built-in speaker module (U11), and a built-in earphone module (U7), as well as a pull-down resistor R1, a pull-down resistor R2, and a pull-down resistor R3. The first audio switch (U5), the second audio switch (U6), and the third audio switch (U8) are used to select the connection mode of the audio signal of the wearable device body (100) in different working modes. The built-in speaker module (U11) is used to play sound when the wearable device body (100) is not connected to the audio module (200). The built-in earphone module (U7) is used to listen to the call sound when the wearable device body (100) is not connected to the audio module (200). The pull-down resistor R1 = the pull-down resistor R2 = the pull-down resistor R3 = 4.7k. The central control module (U9) includes an audio output module AUDIOOUT and a GPIO control module.

2. The modular audio system for a wearable device according to claim 1, characterized in that, When the wearable device body (100) is not connected to the audio module (200), under the action of the pull-down resistor R2, the selection signal SEL6 of the audio switch (U6) causes the left channel OUTP and right channel OUTN signals of the speaker output of the audio output module AUDIO OUT to be connected to the left channel signal OUTP1 and right channel signal OUTN1 of the built-in speaker module (U11) respectively, so that the built-in speaker module (U11) plays music; under the action of the pull-down resistor R3, the selection signal SEL8 of the third audio switch (U8) causes the left channel RCRP and right channel RCRN signals of the handset output of the audio output module AUDIO OUT to be connected to the left channel signal RCRP1 and right channel signal RCRN1 of the handset module (U7) respectively, so that the handset module (U7) plays the call sound.

3. The modular audio system for a wearable device according to claim 1, characterized in that, The input interface (201) includes an INP speaker input signal pin (A2), an INN speaker input signal pin (A3), a PWM control input signal pin (A4), and a first GND signal pin (A5). The output interface (101) includes an INP speaker output signal pin (B2), an INN speaker output signal pin (B3), a PWM control output signal pin (B4), and a second GND signal pin (B5). When the magnetic part (202) and the metal part (102) are magnetically connected, the INP speaker input signal pin (A2) is connected to the INP speaker output signal pin (B2), the INN speaker input signal pin (A3) is connected to the INN speaker output signal pin (B3), the PWM control input signal pin (A4) is connected to the PWM control output signal pin (B4), and the first GND signal pin (A5) is connected to the second GND signal pin (B5).

4. The modular audio system for a wearable device according to claim 3, characterized in that, When the audio module (200) is connected to the wearable device body (100), and the selection signal SEL6 of the second audio switch (U6) is at a high level and the selection signal SEL5 of the first audio switch (U5) is at a low level, the left channel OUTP and right channel OUTN signals of the speaker output of the audio output module AUDIO OUT are respectively connected to the left channel signal OUTP0 and right channel signal OUTN0 of the first audio switch (U5). The left channel signal OUTP0 and right channel signal OUTN0 of the first audio switch (U5) are respectively connected to the INP speaker output signal pin (B2) and the INN speaker output signal pin (B3), so that the left channel OUTP and right channel OUTN signals of the speaker output of the audio output module AUDIO OUT are respectively input into the audio power amplifier (U2) through the INP speaker input signal pin (A2) and the INN speaker input signal pin (A3), and the signals VOP and VON amplified by the audio power amplifier (U2) drive the external speaker (U1), so that the external speaker (U1) plays music with a greater power.

5. The modular audio system for a wearable device according to claim 2, characterized in that, The audio module (200) is connected to the wearable device body (100). When the selection signal SEL8 of the third audio switch (U8) is at a high level and the selection signal SEL5 of the first audio switch (U5) is at a high level, the left channel RCRP and right channel RCRN signals output by the earpiece of the audio output module AUDIO OUT are connected to the left channel RCRP0 and right channel RCRN0 signals of the first audio switch (U5) respectively after passing through the third audio switch (U8). The left channel RCRP0 and right channel RCRN0 signals of the earpiece of the first audio switch (U5) are connected to the INP speaker output signal pin (B2) and the INN speaker output signal pin (B3) respectively, so that the left channel RCRP and right channel RCRN signals output by the earpiece of the audio output module AUDIO OUT are input into the audio power amplifier (U2) through the INP speaker input signal pin (A2) and the INN speaker input signal pin (A3) respectively, and the signals VOP and VON amplified by the audio power amplifier (U2) drive the external speaker (U1), so that the external speaker (U1) plays the call sound.

6. The modular audio system for a wearable device according to claim 1, characterized in that, The chip model adopted by the central control module (U9) is MT6725, and the chip model adopted by the Hall module (U10) is APX9136QFI-TRG.

7. The modular audio system for a wearable device according to claim 1, characterized in that, The chip model adopted by the audio power amplifier (U2) is AW8736.

8. The modular audio system for a wearable device according to claim 1, characterized in that, The chip models adopted by the first audio switch (U5), the second audio switch (U6) and the third audio switch (U8) are WAS4729QB.

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