Bluetooth earphone system

Abstract

The application discloses a Bluetooth earphone system, which comprises a charging bin and at least one Bluetooth earphone body accommodated in the charging bin, and a separable electric connection structure is arranged between the charging bin and the Bluetooth earphone body; the charging bin comprises a Bluetooth audio module, an analog audio interface module and a charging interface module; the Bluetooth audio module is integrated with an analog-digital conversion module and a wireless communication module; the charging interface module is integrated with a digital audio interface module connected with the Bluetooth audio module; the analog audio interface module and the digital audio interface module are connected with a non-Bluetooth audio device through signal lines; analog audio signals output by the non-Bluetooth audio device are converted into digital signals, and / or digital audio signals output by the non-Bluetooth audio device are processed by the digital audio interface module, and then the analog audio signals and the digital audio signals are wirelessly transmitted to the Bluetooth earphone body by the Bluetooth audio module. Thus, a user wearing the Bluetooth earphone body can realize wireless monitoring of the non-Bluetooth audio device, the operation is simple, and user experience is improved.

Description

Technical Field

[0001] This invention relates to the field of telecommunications technology, and in particular to Bluetooth headset systems. Background Technology

[0002] In the field of audio playback devices, Bluetooth wireless headphones have been widely used due to their convenience and freedom of movement. However, some audio devices that do not have Bluetooth transmission capabilities (old-fashioned desktop computers, professional sound cards, game controllers, portable MP3 players, early car audio systems, radios, televisions, aircraft cockpit audio equipment, electronic keyboards, electronic wind instruments, etc.) do not have a Bluetooth communication module integrated into their hardware systems. These devices can only connect to wired headphones or powered speakers through wired audio interfaces (such as 3.5mm headphone jacks, RCA interfaces, etc.) and cannot directly establish a wireless connection with Bluetooth headphones to achieve wireless monitoring functionality.

[0003] To overcome the aforementioned shortcomings, existing technologies typically use an external Bluetooth adapter (also known as a Bluetooth transmitter) as an intermediate bridge. Specifically, users need to purchase a separate Bluetooth adapter, connect its audio input port to the audio output port (such as the headphone jack) of an older device via an audio cable, power the adapter (usually through a USB interface or a built-in battery), and then pair it with Bluetooth headphones by operating the buttons on the adapter.

[0004] Although this solution enables wireless audio transmission for audio devices without Bluetooth transmission capabilities to some extent, it has the following shortcomings in actual use: users need to complete multiple physical connections (plug in audio cable, plug in power), turn on the adapter, and manually enter pairing mode before each use, which is complicated and results in a poor user experience. Summary of the Invention

[0005] This invention provides a Bluetooth headset system to address the problems of complex operation and poor user experience when non-Bluetooth audio devices transmit wireless audio via a Bluetooth adapter in the prior art.

[0006] The technical solution adopted in this invention is to design a Bluetooth headset system, including a charging case and at least one Bluetooth headset body housed therein, wherein a detachable electrical connection structure is provided between the charging case and the Bluetooth headset body; the charging case includes:

[0007] Bluetooth audio module, which integrates an analog-to-digital converter module and a wireless communication module for wireless transmission and reception;

[0008] An analog audio interface module, which is connected to the Bluetooth audio module;

[0009] The charging interface module integrates a digital audio interface module that is connected to the Bluetooth audio module. Both the digital audio interface module and the analog audio interface module are connected to non-Bluetooth audio devices via signal lines.

[0010] The analog audio signal output by the non-Bluetooth audio device is transmitted to the analog-to-digital converter via the analog audio interface module, and / or the digital audio signal output by the non-Bluetooth audio device is transmitted to the Bluetooth audio module via the digital audio interface module. The Bluetooth audio module processes the signal and then wirelessly transmits it to the Bluetooth headset body.

[0011] Further, the analog audio interface module includes an analog audio interface J7, operational amplifier U5A, operational amplifier U5B, bidirectional diode D18, bidirectional diode D19, capacitors C31, C32, C33, C34, C35, C36, C37, C38, C40, C41, C42, C43, and resistors R19, R21, R22, R23, R27, R30, R32, R33, R34, R35, R36, and R37.

[0012] The fourth pin of the analog audio interface J7 is connected to the first terminal of the bidirectional diode D19, the first terminal of the resistor R34, the first terminal of the capacitor C37, and the first terminal of the capacitor C40; the second terminal of the capacitor C37 is connected in series with the resistor R30 and then connected to the inverting terminal of the operational amplifier U5A; the capacitor C43 and the resistor R37 are connected in parallel between the inverting terminal and the output terminal of the operational amplifier U5A; the output terminal of the operational amplifier U5A is connected in series with the capacitor C42 and the resistor R35 and then connected to the first input terminal of the Bluetooth audio module.

[0013] The third pin of the analog audio interface J7 is connected to the first terminal of the bidirectional diode D18, the first terminal of the resistor R33, the first terminal of the capacitor C36, and the first terminal of the capacitor C41; the second terminal of the capacitor C36 is connected in series with the resistor R27 and then connected to the inverting terminal of the operational amplifier U5B; the capacitor C38 and the resistor R32 are connected in parallel between the inverting terminal and the output terminal of the operational amplifier U5B; the output terminal of the operational amplifier U5B is connected in series with the capacitor C35 and the resistor R23 and then connected to the second input terminal of the Bluetooth audio module.

[0014] The power supply terminal of the operational amplifier U5B is connected to the first terminal of capacitor C33, the first terminal of capacitor C34, the first terminal of resistor R19, and the first terminal of resistor R21; the second terminal of resistor R19 is connected to the power supply terminal of the Bluetooth audio module.

[0015] The non-inverting input of operational amplifier U5A, the non-inverting input of operational amplifier U5B, the second terminal of resistor R21, the first terminal of resistor R22, the first terminal of capacitor C31, and the first terminal of capacitor C32 are all connected to the reference voltage terminal of the Bluetooth audio module.

[0016] The second terminals of the bidirectional diode D18, the bidirectional diode D19, the resistors R22, R33, R34, and R36, the capacitors C31, C32, C33, C34, C40, and C41, the ground terminal of the operational amplifier U5B, and the first and second pins of the analog audio interface J7 are all connected to the AGND pin.

[0017] The first end of resistor R36 is connected to the GND pin.

[0018] Furthermore, the analog audio interface module is also provided with a first detection circuit, which is used to detect whether a non-Bluetooth audio device is inserted into the analog audio interface J7 through the first signal line;

[0019] The first detection circuit includes a bidirectional diode D16, a resistor R25, and a resistor R26;

[0020] The fifth pin of the analog audio interface J7 is connected to the first end of the resistor R26, the sixth pin of the analog audio interface J7 is connected to the first end of the resistor R25, and the second end of the resistor R25, the second end of the resistor R26 and the first end of the bidirectional diode D16 are all connected to the first detection end of the Bluetooth audio module.

[0021] The bidirectional diode D16 is connected to the GND pin.

[0022] Furthermore, the digital audio interface module includes a digital audio interface USB1, resistors R9, R13, R16, and R17, capacitor C27, bidirectional diodes D13 and D14, and transient voltage suppressor diode TVS1.

[0023] The second and eleventh pins of the digital audio interface USB1, the negative terminal of the transient voltage suppression diode TVS1, and the first terminal of capacitor C27 are connected to form a common node, which serves as the power output terminal.

[0024] The fifth and seventh pins of the digital audio interface USB1 are connected to the first end of resistor R13, and the second end of resistor R13 is connected to the negative data port of the Bluetooth audio module; the sixth and eighth pins of the digital audio interface USB1 are connected to the first end of resistor R16, and the second end of resistor R16 is connected to the positive data port of the Bluetooth audio module.

[0025] The fourth pin of the digital audio interface USB1 is connected to the first end of resistor R9 and the first end of bidirectional diode D14; the ninth pin of the digital audio interface USB1 is connected to the first end of bidirectional diode D13; and the tenth pin of the digital audio interface USB1 is connected to the first end of resistor R17.

[0026] The first and twelfth pins of the digital audio interface USB1, the positive terminal of the transient voltage suppression diode TVS1, the second terminal of resistor R9, the second terminal of resistor R17, the second terminal of bidirectional diode D13, the second terminal of bidirectional diode D14, and the second terminal of capacitor C27 are all connected to the GND pin.

[0027] Furthermore, the Bluetooth headset system also includes a second detection circuit, which is used to detect whether a non-Bluetooth audio device is inserted into the digital audio interface USB1 via a second signal line;

[0028] The second detection circuit includes resistors R28, R29, and R31, and capacitor C39;

[0029] The power output terminal is connected to the first terminal of resistor R28, and the second terminal of resistor R28 is connected to the first terminal of resistor R29 and the first terminal of resistor R31.

[0030] The second end of resistor R29 and the first end of capacitor C39 are connected to the second detection end of the Bluetooth audio module.

[0031] The second end of resistor R31 and the second end of capacitor C39 are connected to the GND pin.

[0032] Furthermore, the Bluetooth headset system also includes a power management module, which integrates at least one of a boost circuit, an overvoltage protection circuit, and an overcurrent protection circuit.

[0033] The power management module is connected to both the Bluetooth audio module and the digital audio interface module.

[0034] Furthermore, the power management module includes a management chip U4, a Hall switch U3, a button SW1, an inductor L4, LEDs D10, D11, and D12, a thermistor NTC2, resistors Riset1 and Riset2, resistors R7, R8, R10, R14, R15, and R18, and capacitors C28, C29, and C30.

[0035] The first pin of the management chip U4 is connected to the first end of resistor R8, the first end of resistor Riset1, and the first end of resistor R7. The second end of resistor R7 is connected to the first end of button SW1. The second end of resistor R8 is connected to the positive terminal of light-emitting diode D10.

[0036] The second pin of the management chip U4 is connected to the first end of resistor R10 and the first end of resistor Riset2. The second end of resistor Riset2 is connected to the Vout pin of the Hall switch. The second end of resistor R10 is connected to the positive terminal of light-emitting diode D11.

[0037] The third pin of the management chip U4 is connected to the first terminal of the thermistor NTC2 and the first terminal of the resistor R15, and the second terminal of the resistor R15 is connected to the positive terminal of the light-emitting diode D12.

[0038] The fifth pin of the management chip U4 is connected to the first end of the resistor R18 and then to the power output of the digital audio interface module; the second end of the resistor R18 is connected to the first end of the capacitor C30.

[0039] The seventh pin of the management chip U4 is connected to the first terminal of the inductor L4; the sixth pin of the management chip U4, the second terminal of the inductor L4, and the first terminal of the capacitor C29 are all connected to the battery.

[0040] The eighth pin of the management chip U4 is connected to the first end of capacitor C28 and the first end of resistor R14, and the second end of resistor R14 is connected to the DC power supply of the Bluetooth audio module.

[0041] The ninth and tenth pins of the management chip U4 are connected in series with a charging contact point of the Bluetooth headset body and then connected to the GND pin.

[0042] The eleventh pin of the management chip U4, the VSS pin of the Hall switch, the second terminal of the button SW1, the second terminal of the resistor Riset1, the second terminal of the thermistor NTC2, the negative terminal of LED D10, the negative terminal of LED D11, the negative terminal of LED D12, the second terminal of capacitor C28, the second terminal of capacitor C29, and the second terminal of capacitor C30 are all connected to the GND pin.

[0043] Furthermore, the wireless communication module includes bidirectional diode D22, bidirectional diode D23, capacitor C53, capacitor C54, capacitor C55, capacitor C56, resistor R39, inductor L5, and antenna ANT.

[0044] The signal output terminal of the Bluetooth audio module is connected to the first terminal of the bidirectional diode D22, the first terminal of the capacitor C54 and the first terminal of the resistor R39. The first terminal of the resistor R39 is connected to the first terminal of the capacitor C53, the first terminal of the capacitor C56 and the first terminal of the inductor L5. The second terminal of the inductor L5 is connected to the first terminal of the capacitor C55, the first terminal of the bidirectional diode D23 and the first terminal of the antenna ANT.

[0045] The second terminals of bidirectional diode D22, bidirectional diode D23, antenna ANT, capacitor C53, capacitor C54, capacitor C55, and capacitor C56 are all connected to the GND pin.

[0046] Furthermore, the analog audio interface module includes at least one analog audio interface, which is any one of a TRS interface, an XLR interface, and a TS interface.

[0047] Furthermore, the digital audio interface module includes at least one digital audio interface, which is any one of a Type-C interface, a Lightning interface, and a Type-A interface.

[0048] Compared with the prior art, the present invention has at least the following beneficial effects:

[0049] The analog audio interface module and / or digital audio interface module proposed in this invention connect to a non-Bluetooth audio device via a signal cable, and then wirelessly transmit music or other audio data played by the non-Bluetooth audio device to the Bluetooth headset via the Bluetooth audio module. This allows the user wearing the Bluetooth headset to wirelessly monitor the non-Bluetooth audio device, which is simple to operate and improves the user experience. Attached Figure Description

[0050] The present invention will now be described in detail with reference to the embodiments and accompanying drawings, wherein:

[0051] Figure 1 This is a schematic diagram of the Bluetooth headset system proposed in this invention;

[0052] Figure 2 This is a block diagram of the Bluetooth headset system proposed in this invention;

[0053] Figure 3 This is a circuit diagram of the analog audio interface module proposed in this invention;

[0054] Figure 4 This is a circuit diagram of the digital audio interface module proposed in this invention;

[0055] Figure 5 This is a circuit diagram of the second detection circuit proposed in this invention;

[0056] Figure 6 This is a circuit diagram of the power management module proposed in this invention;

[0057] Figure 7 This is a circuit diagram of the wireless communication module proposed in this invention;

[0058] Figure 8 This is a circuit diagram of the Bluetooth audio module proposed in this invention.

[0059] Figure label:

[0060] 10. Charging case;

[0061] 101. Bluetooth audio module; 102. Wireless communication module; 103. Analog audio interface module; 104. Digital audio interface module; 105. First detection circuit; 106. Second detection circuit; 107. Power management module;

[0062] 20. Bluetooth headset main body. Detailed Implementation

[0063] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0064] In the field of audio playback devices, Bluetooth wireless headphones have been widely used due to their convenience and freedom of movement. However, some audio devices that do not have Bluetooth transmission capabilities (old-fashioned desktop computers, professional sound cards, game controllers, portable MP3 players, early car audio systems, radios, televisions, aircraft cockpit audio equipment, electronic keyboards, electronic wind instruments, etc.) do not have a Bluetooth communication module integrated into their hardware systems. These devices can only connect to wired headphones or powered speakers through wired audio interfaces (such as 3.5mm headphone jacks, RCA interfaces, etc.) and cannot directly establish a wireless connection with Bluetooth headphones to achieve wireless monitoring functionality.

[0065] To overcome the aforementioned shortcomings, existing technologies typically use an external Bluetooth adapter (also known as a Bluetooth transmitter) as an intermediate bridge. Specifically, users need to purchase a separate Bluetooth adapter, connect its audio input port to the audio output port (such as the headphone jack) of an older device via an audio cable, power the adapter (usually through a USB interface or a built-in battery), and then pair it with Bluetooth headphones by operating the buttons on the adapter.

[0066] Although this solution enables wireless audio transmission for audio devices without Bluetooth transmission capabilities to some extent, it has the following shortcomings in actual use: users need to complete multiple physical connections (plug in audio cable, plug in power), turn on the adapter, and manually enter pairing mode before each use, which is complicated and results in a poor user experience.

[0067] Therefore, in some embodiments, such as Figures 1 to 2 As shown, this invention proposes a Bluetooth headset system, including a charging case 10 and at least one Bluetooth headset body 20 housed therein. A detachable electrical connection structure is provided between the charging case 10 and the Bluetooth headset body 20. The charging case 10 includes:

[0068] Bluetooth audio module 101, which integrates an analog-to-digital converter module and a wireless communication module 102 for wireless transmission and reception;

[0069] An analog audio interface module 103 is connected to the Bluetooth audio module 101;

[0070] The charging interface module integrates a digital audio interface module 104 connected to the Bluetooth audio module 101. Both the digital audio interface module 104 and the analog audio interface module 103 are connected to non-Bluetooth audio devices via signal lines.

[0071] The analog audio signal output by the non-Bluetooth audio device is transmitted to the analog-to-digital converter via the analog audio interface module 103, and / or the digital audio signal output by the non-Bluetooth audio device is transmitted to the Bluetooth audio module 101 via the digital audio interface module 104. The Bluetooth audio module 101 processes the signal and then wirelessly transmits it to the Bluetooth headset body 20.

[0072] It is understood that analog audio signals output by non-Bluetooth audio devices are transmitted to analog-to-digital conversion modules via analog audio interface module 103, and then processed by Bluetooth audio module 101 before being wirelessly transmitted to Bluetooth headset body 20; and / or digital audio signals output by non-Bluetooth audio devices are transmitted to Bluetooth audio module 101 via digital audio interface module 104, and then processed by Bluetooth audio module 101 before being wirelessly transmitted to Bluetooth headset body 20.

[0073] The analog audio interface module 103 includes at least one analog audio interface J7, which can be any one of a TRS interface, an XLR interface, and a TS interface. The digital audio interface module 104 includes at least one digital audio interface USB1, which can be any one of a Type-C interface, a Lightning interface, and a Type-A interface. Both the analog audio interface J7 and the digital audio interface USB1 have corresponding sockets on the charging case 10 housing for users to insert corresponding signal cables.

[0074] It should be noted that this embodiment uses an analog audio interface J7 and a digital audio interface USB1 as an example, and the analog audio interface J7 is preferably a 3.5mm TRS interface / audio interface, and the digital audio interface USB1 is preferably a Type-C interface.

[0075] The Bluetooth audio module 101 transmits data with the wireless chips within a pair of Bluetooth headset bodies 20 via a proprietary 2.4G protocol. This 2.4G protocol is used for one-to-one binding of the Bluetooth audio module 101 to the L / R wireless chips of the Bluetooth headset body 20. Compared to classic Bluetooth latency (>200ms), the 2.4G proprietary protocol offers ultra-low latency, stability, and resistance to signal interference, reducing latency to within 10ms, significantly lower than classic Bluetooth latency. This makes it suitable for applications such as live streaming, gaming, karaoke, and real-time monitoring, solving the significant latency problem of ordinary Bluetooth headsets. Of course, the 2.4G proprietary protocol can also be replaced with a 5.8G proprietary protocol, or the Kleer protocol with frequency bands including 2.4GHz / 5.2GHz / 5.8GHz, depending on the specific needs; this is not limited here.

[0076] Furthermore, the present invention proposes a Bluetooth headset system including the structure and corresponding circuitry of existing Bluetooth headset applications such as the charging case battery, the Bluetooth headset main battery, the charging case button, and the charging case indicator light, which will not be elaborated upon here.

[0077] In this way, when a non-Bluetooth audio device (taking an old desktop computer without Bluetooth transmission function as an example) is plugged into the 3.5mm audio interface of the analog audio interface module 103 via a signal cable, the desktop computer plays music or other audio data and transmits it to the Bluetooth audio module 101 in the form of an analog audio data stream via the signal cable. This analog audio data stream is converted into a digital audio data stream by the analog-to-digital converter module. Then, the Bluetooth audio module 101 converts the converted digital audio data stream into a first wireless audio signal suitable for wireless transmission. This first wireless audio signal is then sent to the Bluetooth headset body 20 via the wireless communication module 102. The Bluetooth headset body 20 receives the first wireless audio signal, thereby realizing wireless monitoring so that the user wearing the Bluetooth headset body 20 can hear the music or other audio data played by the old desktop computer.

[0078] When the old desktop computer is plugged into the Type-C interface of the digital audio interface module 104 via a signal cable, the old desktop computer recognizes the Bluetooth audio module 101 as an audio headset device. The old desktop computer plays music or other audio data via the UAC audio protocol and transmits it to the Bluetooth audio module 101 in the form of a digital audio data stream via the signal cable. The Bluetooth audio module 101 receives the digital audio data stream and converts it into a second wireless audio signal suitable for wireless transmission. The second wireless audio signal is then sent to the Bluetooth headset body 20 via the wireless communication module 102. The Bluetooth headset body 20 receives the second wireless audio signal, thereby realizing wireless monitoring so that the music or other audio data played by the old desktop computer can be heard by the user wearing the Bluetooth headset body 20.

[0079] When the digital audio data stream needs to be converted into a wireless audio signal suitable for wireless transmission, the Bluetooth audio module 101 encodes and compresses the digital audio data stream. The encoded audio data packets are encapsulated layer by layer according to the Bluetooth protocol stack and finally sent out by the wireless communication module 102 in the form of radio waves. The Bluetooth headset body 20 receives the data and then decodes and plays it.

[0080] Of course, both the Type-C port and the 3.5mm audio jack of the charging case 10 can be connected to the same non-Bluetooth audio device via a signal cable, with the Type-C port being used first for audio transmission and charging. The Type-C port and the 3.5mm audio jack of the charging case 10 can also be connected to different non-Bluetooth audio devices via a signal cable. For example, the Type-C port can be connected to an older desktop computer for audio transmission and wireless monitoring; the 3.5mm audio jack can be connected to an MP3 player / game controller for wireless monitoring of game audio. This is not a limitation.

[0081] Therefore, the analog audio interface module 103 and / or digital audio interface module 104 proposed in this invention are connected to non-Bluetooth audio devices via signal lines, and then the Bluetooth audio module 101 wirelessly transmits music or other audio data played by the non-Bluetooth audio devices to the Bluetooth headset body 20, so that the user wearing the Bluetooth headset body 20 can wirelessly monitor the non-Bluetooth audio devices. The operation is simple and improves the user experience.

[0082] Furthermore, the non-Bluetooth audio devices proposed in this embodiment also include professional sound cards, game controllers, portable MP3 players, early car audio systems, radios, televisions, aircraft cockpit audio equipment, electronic keyboards, and electronic wind instruments. These wireless monitoring scenarios typically include: practicing electronic instruments such as electronic keyboards and electronic wind instruments (in student dormitories / homes) without disturbing others, and wearing the Bluetooth headset (ear monitor) at appropriate times eliminates concerns about latency affecting practice; game controller audio output can also achieve wireless monitoring, freeing users from headphone wires; enjoying exclusive in-flight music while traveling; wireless monitoring of portable MP3 players and televisions; during live streaming, this Bluetooth headset system directly connects to the sound card, allowing real-time monitoring without being affected by wires and latency, making it more flexible for broadcasters when moving around or showcasing products; and real-time wireless monitoring of musical instrument performances, thus greatly expanding the application scenarios of the Bluetooth headset system.

[0083] In this paper, wireless monitoring refers to listening to the sound signal output by a non-Bluetooth audio device in real time through wireless communication technology (such as Bluetooth, 2.4G digital radio frequency, etc.) without using wired headphones or speakers.

[0084] In some embodiments, to ensure that the analog audio signal output by the non-Bluetooth audio device can be stably transmitted to the Bluetooth audio module 101 via the analog audio interface module 103, such as... Figure 3 As shown, this embodiment proposes a circuit structure for an analog audio interface module 103, which includes: an analog audio interface J7, operational amplifier U5A, operational amplifier U5B, bidirectional diode D18, bidirectional diode D19, capacitors C31, C32, C33, C34, C35, C36, C37, C38, C40, C41, C42, C43, and resistors R19, R21, R22, R23, R27, R30, R32, R33, R34, R35, R36, and R37.

[0085] The fourth pin of the analog audio interface J7 is connected to the first terminal of the bidirectional diode D19, the first terminal of the resistor R34, the first terminal of the capacitor C37, and the first terminal of the capacitor C40; the second terminal of the capacitor C37 is connected in series with the resistor R30 and then connected to the inverting terminal of the operational amplifier U5A; the capacitor C43 and the resistor R37 are connected in parallel between the inverting terminal and the output terminal of the operational amplifier U5A; the output terminal of the operational amplifier U5A is connected in series with the capacitor C42 and the resistor R35 and then connected to the first input terminal of the Bluetooth audio module 101.

[0086] The third pin of the analog audio interface J7 is connected to the first terminal of the bidirectional diode D18, the first terminal of the resistor R33, the first terminal of the capacitor C36, and the first terminal of the capacitor C41; the second terminal of the capacitor C36 is connected in series with the resistor R27 and then connected to the inverting terminal of the operational amplifier U5B; the capacitor C38 and the resistor R32 are connected in parallel between the inverting terminal and the output terminal of the operational amplifier U5B; the output terminal of the operational amplifier U5B is connected in series with the capacitor C35 and the resistor R23 and then connected to the second input terminal of the Bluetooth audio module 101.

[0087] The power supply terminal of the operational amplifier U5B is connected to the first terminal of capacitor C33, the first terminal of capacitor C34, the first terminal of resistor R19, and the first terminal of resistor R21; the second terminal of resistor R19 is connected to the power supply terminal of Bluetooth audio module 101.

[0088] The non-inverting input of the operational amplifier U5A, the non-inverting input of the operational amplifier U5B, the second terminal of resistor R21, the first terminal of resistor R22, the first terminal of capacitor C31, and the first terminal of capacitor C32 are all connected to the reference voltage terminal of the Bluetooth audio module 101.

[0089] The second terminals of the bidirectional diode D18, the bidirectional diode D19, the resistors R22, R33, R34, and R36, the capacitors C31, C32, C33, C34, C40, and C41, the ground terminal of the operational amplifier U5B, and the first and second pins of the analog audio interface J7 are all connected to the AGND pin.

[0090] The first end of resistor R36 is connected to the GND pin.

[0091] Among them, such as Figure 3 As shown, the analog audio interface module 103 is further provided with a first detection circuit 105, which is used to detect whether a non-Bluetooth audio device is inserted into the analog audio interface J7 through a signal line.

[0092] This embodiment proposes a circuit structure for a first detection circuit 105, which includes: a bidirectional diode D16, a resistor R25, and a resistor R26;

[0093] The fifth pin of the analog audio interface J7 is connected to the first end of the resistor R26, the sixth pin of the analog audio interface J7 is connected to the first end of the resistor R25, and the second end of the resistor R25, the second end of the resistor R26 and the first end of the bidirectional diode D16 are all connected to the first detection end of the Bluetooth audio module 101.

[0094] The bidirectional diode D16 is connected to the GND pin.

[0095] In this way, the Bluetooth audio module 101 can detect whether a non-Bluetooth audio device is plugged into the analog audio interface J7 via the first detection circuit 105; if so, the Bluetooth audio module 101 will send the analog audio data stream output by the non-Bluetooth audio device to the Bluetooth headset body 20; if not, the Bluetooth audio module 101 will not send it.

[0096] In some embodiments, to ensure that the digital audio signal output by the non-Bluetooth audio device can be stably transmitted to the Bluetooth audio module 101 via the digital audio interface module 104, such as Figure 4 As shown, this embodiment proposes a circuit structure for a digital audio interface module 104, which includes: a digital audio interface USB1, resistors R9, R13, R16, and R17, a capacitor C27, a bidirectional diode D13, a bidirectional diode D14, and a transient voltage suppression diode TVS1.

[0097] The second and eleventh pins of the digital audio interface USB1, the negative terminal of the transient voltage suppression diode TVS1, and the first terminal of capacitor C27 are connected to form a common node, which serves as the power output terminal.

[0098] The fifth and seventh pins of the digital audio interface USB1 are connected to the first end of resistor R13, and the second end of resistor R13 is connected to the negative data port of Bluetooth audio module 101; the sixth and eighth pins of the digital audio interface USB1 are connected to the first end of resistor R16, and the second end of resistor R16 is connected to the positive data port of Bluetooth audio module 101.

[0099] The fourth pin of the digital audio interface USB1 is connected to the first end of resistor R9 and the first end of bidirectional diode D14; the ninth pin of the digital audio interface USB1 is connected to the first end of bidirectional diode D13; and the tenth pin of the digital audio interface USB1 is connected to the first end of resistor R17.

[0100] The first and twelfth pins of the digital audio interface USB1, the positive terminal of the transient voltage suppression diode TVS1, the second terminal of resistor R9, the second terminal of resistor R17, the second terminal of bidirectional diode D13, the second terminal of bidirectional diode D14, and the second terminal of capacitor C27 are all connected to the GND pin.

[0101] In this embodiment, the digital audio interface USB1 has sixteen pins. Pins 1, 12, 13, 14, 15, and 16 are all GND pins; pins 2 and 11 are VBUS (VCC) pins; pins 3 and 10 are VBUS pins; pin 4 is a D+ pin; pins 5 and 7 are DM pins; pins 6 and 8 are DP pins; pin 9 is a D- pin; and pins 13 through 16 can be removed, meaning the digital audio interface USB1 has twelve pins, which is not limited here.

[0102] Capacitor C27 is the input filter capacitor, filtering out high-frequency noise in the output power supply, stabilizing the supply voltage, and preventing power fluctuations. When a transient overvoltage occurs at the power output (such as static electricity or surge), the transient voltage suppression diode TVS1 can quickly conduct to discharge current, protecting the downstream circuit from being damaged. Resistor R9 is the pull-up resistor for the DM pin, and resistor R17 is the pull-up resistor for the DP pin, used to cooperate in signal recognition during USB device enumeration, helping the Bluetooth audio module 101 determine the type of connected device. Resistor R13 is the series resistor for the DM pin, limiting the signal rise during data transmission. On the one hand, it limits the rising edge of the signal during data transmission, reducing high-frequency harmonic interference; on the other hand, it works with resistor R9 to achieve impedance matching of differential signals, improving data transmission stability; resistor R16 is the series resistor for the DP pin, limiting the rising edge of the signal during data transmission, reducing high-frequency harmonic interference; on the other hand, it works with resistor R17 to achieve impedance matching of differential signals, improving data transmission stability; bidirectional diodes D13 and D14 provide bidirectional electrostatic protection to prevent positive and negative electrostatic shocks from damaging the interface circuit; J4, J5, and J6 are all test pads used for signal sampling or voltage measurement during production testing, facilitating troubleshooting of circuit faults during the debugging phase.

[0103] Among them, such as Figure 5 As shown, the Bluetooth headset system also includes a second detection circuit 106, which is used to detect whether a non-Bluetooth audio device is plugged into the digital audio interface USB1 via a signal line;

[0104] This embodiment proposes a circuit structure for a second detection circuit 106, which includes: resistor R28, resistor R29, resistor R31, and capacitor C39;

[0105] The power output terminal is connected to the first terminal of resistor R28, and the second terminal of resistor R28 is connected to the first terminal of resistor R29 and the first terminal of resistor R31.

[0106] The second end of the resistor R29 and the first end of the capacitor C39 are connected to the second detection end of the Bluetooth audio module 101.

[0107] The second end of resistor R31 and the second end of capacitor C39 are connected to the GND pin.

[0108] In this way, the Bluetooth audio module 101 can detect whether a non-Bluetooth audio device is plugged into the digital audio interface USB1 via the second detection circuit 106; if so, the Bluetooth audio module 101 will send the digital audio data stream output by the non-Bluetooth audio device to the Bluetooth headset body 20; if not, the Bluetooth audio module 101 will not send it.

[0109] In some embodiments, such as Figure 2 As shown, the Bluetooth headset system also includes a power management module 107, which integrates at least one of a boost circuit, an overvoltage protection circuit, and an overcurrent protection circuit.

[0110] The power management module 107 is connected to the Bluetooth audio module 101 and the digital audio interface module 104, respectively.

[0111] Thus, in this embodiment, the power management module 107 provides protection for the Bluetooth headset system when it is being charged. The boost circuit can raise the low voltage of the charging case battery to the standard voltage required for charging the Bluetooth headset body 20. The overvoltage protection circuit can prevent the high input voltage from burning out the precision components inside the Bluetooth headset body 20. The overcurrent protection circuit can limit the output current to prevent short circuits or damage from excessive battery current, thus extending the service life of the Bluetooth headset system.

[0112] In some embodiments, such as Figure 6 As shown, this embodiment proposes a circuit structure for a power management module 107, which includes: a management chip U4, a Hall switch U3, a button SW1, an inductor L4, light-emitting diodes D10, D11, and D12, a thermistor NTC2, resistors Riset1 and Riset2, resistors R7, R8, R10, R14, R15, and R18, and capacitors C28, C29, and C30.

[0113] The first pin of the management chip U4 is connected to the first end of resistor R8, the first end of resistor Riset1, and the first end of resistor R7. The second end of resistor R7 is connected to the first end of button SW1. The second end of resistor R8 is connected to the positive terminal of light-emitting diode D10.

[0114] The second pin of the management chip U4 is connected to the first end of resistor R10 and the first end of resistor Riset2. The second end of resistor Riset2 is connected to the Vout pin of the Hall switch. The second end of resistor R10 is connected to the positive terminal of light-emitting diode D11.

[0115] The third pin of the management chip U4 is connected to the first terminal of the thermistor NTC2 and the first terminal of the resistor R15, and the second terminal of the resistor R15 is connected to the positive terminal of the light-emitting diode D12.

[0116] The fifth pin of the management chip U4 is connected to the first end of the resistor R18 and then to the power output of the digital audio interface module 104; the second end of the resistor R18 is connected to the first end of the capacitor C30.

[0117] The seventh pin of the management chip U4 is connected to the first terminal of the inductor L4; the sixth pin of the management chip U4, the second terminal of the inductor L4, and the first terminal of the capacitor C29 are all connected to the battery.

[0118] The eighth pin of the management chip U4 is connected to the first end of capacitor C28 and the first end of resistor R14, and the second end of resistor R14 is connected to the DC power supply terminal of Bluetooth audio module 101.

[0119] The ninth and tenth pins of the management chip U4 are connected in series with a charging contact point of the Bluetooth headset body 20 and then connected to the GND pin.

[0120] The eleventh pin of the management chip U4, the VSS pin of the Hall switch, the second terminal of the button SW1, the second terminal of the resistor Riset1, the second terminal of the thermistor NTC2, the negative terminal of LED D10, the negative terminal of LED D11, the negative terminal of LED D12, the second terminal of capacitor C28, the second terminal of capacitor C29, and the second terminal of capacitor C30 are all connected to the GND pin.

[0121] It should be noted that the management chip U4 is model IP5426V, IP5528, or IP5518. The management chip U4 described in this embodiment is IP5426V. This management chip U4 has eleven pins: the first pin is the KEY pin, the second pin is the HALL pin, the third pin is the NTC pin, the fourth pin is the LN pin, the fifth pin is the VIN pin, the sixth pin is the BAT pin, the seventh pin is the LX pin, the eighth pin is the OUT pin, the ninth pin is the VPHL pin, the tenth pin is the VPHR pin, and the eleventh pin is the EPAD pin.

[0122] Hall switch U3 is used to detect the open / closed state of charging case 10, thereby controlling the circuit on / off; inductor L4, together with the boost circuit in management chip U4, achieves voltage boosting through the charging and discharging process; capacitors C28 and C29 are used to filter out the ripple of the output voltage, ensuring a stable and smooth 5V voltage provided to Bluetooth audio module 101; resistors R7, R8, R10, R14, and R15 mainly serve as voltage dividers and current limiters, providing appropriate reference voltages for Hall switch U3 and management chip U4, while limiting circuit current to ensure that components operate within a safe current range; resistor R18, together with capacitor C30, forms a filter circuit to filter out noise from the input power supply, providing a clean input voltage for management chip U4; thermistor NTC2 is used to detect the battery temperature in real time. When the battery temperature is too high or too low, it sends a signal to management chip U4, which adjusts the charging strategy to prevent battery damage due to abnormal temperature; the charging contact point is the connection port between charging case 10 and Bluetooth headset body 20, charging the Bluetooth headset body battery.

[0123] In some embodiments, such as Figure 7 As shown, this embodiment proposes a circuit structure for a wireless communication module 102, which includes: bidirectional diode D22, bidirectional diode D23, capacitor C53, capacitor C54, capacitor C55, capacitor C56, resistor R39, inductor L5, and antenna ANT.

[0124] The signal output terminal of the Bluetooth audio module 101 is connected to the first terminal of the bidirectional diode D22, the first terminal of the capacitor C54 and the first terminal of the resistor R39. The first terminal of the resistor R39 is connected to the first terminal of the capacitor C53, the first terminal of the capacitor C56 and the first terminal of the inductor L5. The second terminal of the inductor L5 is connected to the first terminal of the capacitor C55, the first terminal of the bidirectional diode D23 and the first terminal of the antenna ANT.

[0125] The second terminals of bidirectional diode D22, bidirectional diode D23, antenna ANT, capacitor C53, capacitor C54, capacitor C55, and capacitor C56 are all connected to the GND pin.

[0126] Thus, after the Bluetooth radio frequency signal (equivalent to the first and second wireless audio signals) output from the signal output terminal of the Bluetooth audio module 101 enters the wireless communication module 102, the bidirectional diode D22 provides anti-static and amplitude limiting protection to prevent excessive instantaneous voltage from damaging subsequent circuits; capacitor C54 is an RF bypass capacitor used to filter out low-frequency noise in the signal and provide a low-impedance path for the RF signal to ensure smooth transmission; resistor R39 is an RF matching resistor with a resistance of 0Ω (i.e., jumper resistor), mainly used for impedance matching during the debugging phase, and can be adjusted according to actual test conditions to optimize signal transmission efficiency; C 53 is also an RF bypass capacitor, further filtering out noise and stabilizing the RF signal; inductor L5 is an RF choke inductor, used to suppress high-frequency noise while allowing the RF signal to pass through, improving signal purity; capacitor C56 is an RF coupling capacitor, used to block DC and pass AC, ensuring that the RF signal can be transmitted to subsequent circuits, while avoiding the influence of DC voltage; capacitor C55 is an RF bypass capacitor, further optimizing the signal transmission quality; bidirectional diode D23 also plays a role in anti-static and amplitude limiting protection, protecting the antenna ANT; the antenna ANT is responsible for radiating the RF signal so that the wireless communication module in the Bluetooth headset body 20 can receive it.

[0127] In some embodiments, such as Figure 8 As shown, the Bluetooth audio module 101 includes a chip U6. The model of the chip U6 is ATS3031 as an example. Of course, the chip U6 can also be selected as the chip BES2600YP or other chips with similar functions, depending on the actual situation. No limitation is made here.

[0128] Specifically, the MICIN_ON pin of chip U6 is equivalent to the first input terminal of Bluetooth audio module 101, the MICIN_OP pin of chip U6 is equivalent to the second input terminal of Bluetooth audio module 101, the VCC pin of chip U6 is equivalent to the power supply terminal of Bluetooth audio module 101, the VREF pin of chip U6 is equivalent to the reference voltage terminal of Bluetooth audio module 101, the GPIO19 pin of chip U6 is equivalent to the first detection terminal of Bluetooth audio module 101, the USB_DM pin of chip U6 is equivalent to the negative data port of Bluetooth audio module 101, the USB_DP pin of chip U6 is equivalent to the positive data port of Bluetooth audio module 101, the GPIO18 pin of chip U6 is equivalent to the second detection terminal of Bluetooth audio module 101, and the DC5V pin of chip U6 is equivalent to the DC power supply terminal of Bluetooth audio module 101.

[0129] The HOSCO pin of chip U6 is connected to the first terminal of crystal oscillator Y2, the HOSCI pin of chip U6 is connected to the third terminal of crystal oscillator Y2, and the second and fourth terminals of crystal oscillator Y2 are both connected to the GND pin.

[0130] In particular, the VBAT, DC5V, VCC, SVCC, AVCC, VDD, and IOVCC pins of chip U6 are each connected in series with a capacitor and then connected to the GND pin.

[0131] Furthermore, the U6 chip is a system-on-a-chip, which integrates a microcontroller, an RF transceiver, and a digital signal processor (DSP). The Bluetooth audio module 101, the wireless communication module 102, the analog audio interface module 103, the digital audio interface module 104, the first detection circuit 105, the second detection circuit 106, and the power management module 107 are all integrated on a PCBA board, which is located inside the charging compartment 10.

[0132] It should be noted that the terminology used above is for describing specific embodiments only and is not intended to limit the exemplary embodiments of the present invention. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The order of execution of actions, steps, etc., in the apparatus and methods shown in the specification and drawings may be implemented in any order unless a specific express order is specified, and as long as the output of a previous process is not used in a subsequent process. Similar sequential terms used for ease of description do not imply that such an order must be followed.

[0133] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as constraints. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0134] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A Bluetooth headset system, comprising a charging case (10) and at least one Bluetooth headset body (20) housed therein, wherein the charging case (10) and the Bluetooth headset body (20) are provided with detachable electrical connection structures; characterized in that, The charging compartment (10) includes: Bluetooth audio module (101) integrates an analog-to-digital converter module and a wireless communication module (102) for wireless transceiver. An analog audio interface module (103) is connected to the Bluetooth audio module (101); The charging interface module integrates a digital audio interface module (104) connected to the Bluetooth audio module (101). Both the digital audio interface module (104) and the analog audio interface module (103) are connected to non-Bluetooth audio devices via signal lines. The analog audio signal output by the non-Bluetooth audio device is transmitted to the analog-to-digital conversion module via the analog audio interface module (103) for conversion, and / or the digital audio signal output by the non-Bluetooth audio device is transmitted to the Bluetooth audio module (101) via the digital audio interface module (104), and is then processed by the Bluetooth audio module (101) and wirelessly transmitted to the Bluetooth headset body (20).

2. The Bluetooth headset system according to claim 1, characterized in that, The analog audio interface module (103) includes an analog audio interface J7, operational amplifier U5A, operational amplifier U5B, bidirectional diode D18, bidirectional diode D19, capacitors C31, C32, C33, C34, C35, C36, C37, C38, C40, C41, C42, C43, and resistors R19, R21, R22, R23, R27, R30, R32, R33, R34, R35, R36, and R37. The fourth pin of the analog audio interface J7 is connected to the first terminal of the bidirectional diode D19, the first terminal of the resistor R34, the first terminal of the capacitor C37, and the first terminal of the capacitor C40; the second terminal of the capacitor C37 is connected to the inverting terminal of the operational amplifier U5A after being connected in series with the resistor R30; the capacitor C43 and the resistor R37 are connected in parallel between the inverting terminal and the output terminal of the operational amplifier U5A; the output terminal of the operational amplifier U5A is connected to the first input terminal of the Bluetooth audio module (101) after being connected in series with the capacitor C42 and the resistor R35. The third pin of the analog audio interface J7 is connected to the first terminal of the bidirectional diode D18, the first terminal of the resistor R33, the first terminal of the capacitor C36, and the first terminal of the capacitor C41; the second terminal of the capacitor C36 is connected to the inverting terminal of the operational amplifier U5B after being connected in series with the resistor R27; the capacitor C38 and the resistor R32 are connected in parallel between the inverting terminal and the output terminal of the operational amplifier U5B; the output terminal of the operational amplifier U5B is connected to the second input terminal of the Bluetooth audio module (101) after being connected in series with the capacitor C35 and the resistor R23. The power supply terminal of the operational amplifier U5B is connected to the first terminal of capacitor C33, the first terminal of capacitor C34, the first terminal of resistor R19, and the first terminal of resistor R21; the second terminal of resistor R19 is connected to the power supply terminal of the Bluetooth audio module (101). The non-inverting input of the operational amplifier U5A, the non-inverting input of the operational amplifier U5B, the second terminal of resistor R21, the first terminal of resistor R22, the first terminal of capacitor C31, and the first terminal of capacitor C32 are all connected to the reference voltage terminal of the Bluetooth audio module (101). The second terminals of the bidirectional diode D18, the bidirectional diode D19, the resistors R22, R33, R34, and R36, the capacitors C31, C32, C33, C34, C40, and C41, the ground terminal of the operational amplifier U5B, and the first and second pins of the analog audio interface J7 are all connected to the AGND pin. The first end of resistor R36 is connected to the GND pin.

3. The Bluetooth headset system according to claim 2, characterized in that, The analog audio interface module (103) is further provided with a first detection circuit (105), which is used to detect whether a non-Bluetooth audio device is inserted into the analog audio interface J7 through the first signal line; The first detection circuit (105) includes a bidirectional diode D16, a resistor R25, and a resistor R26; The fifth pin of the analog audio interface J7 is connected to the first end of the resistor R26, the sixth pin of the analog audio interface J7 is connected to the first end of the resistor R25, and the second end of the resistor R25, the second end of the resistor R26 and the first end of the bidirectional diode D16 are all connected to the first detection end of the Bluetooth audio module (101). The bidirectional diode D16 is connected to the GND pin.

4. The Bluetooth headset system according to claim 1, characterized in that, The digital audio interface module (104) includes a digital audio interface USB1, resistors R9, R13, R16, and R17, capacitor C27, bidirectional diodes D13 and D14, and transient voltage suppression diode TVS1. The second and eleventh pins of the digital audio interface USB1, the negative terminal of the transient voltage suppression diode TVS1, and the first terminal of capacitor C27 are connected to form a common node, which serves as the power output terminal. The fifth and seventh pins of the digital audio interface USB1 are connected to the first end of resistor R13, and the second end of resistor R13 is connected to the negative data port of Bluetooth audio module (101); the sixth and eighth pins of the digital audio interface USB1 are connected to the first end of resistor R16, and the second end of resistor R16 is connected to the positive data port of Bluetooth audio module (101). The fourth pin of the digital audio interface USB1 is connected to the first end of resistor R9 and the first end of bidirectional diode D14; the ninth pin of the digital audio interface USB1 is connected to the first end of bidirectional diode D13; and the tenth pin of the digital audio interface USB1 is connected to the first end of resistor R17. The first and twelfth pins of the digital audio interface USB1, the positive terminal of the transient voltage suppression diode TVS1, the second terminal of resistor R9, the second terminal of resistor R17, the second terminal of bidirectional diode D13, the second terminal of bidirectional diode D14, and the second terminal of capacitor C27 are all connected to the GND pin.

5. The Bluetooth headset system according to claim 4, characterized in that, The Bluetooth headset system also includes a second detection circuit (106) for detecting whether a non-Bluetooth audio device is inserted into the digital audio interface USB1 via a second signal line; The second detection circuit (106) includes resistors R28, R29, R31 and capacitor C39; The power output terminal is connected to the first terminal of resistor R28, and the second terminal of resistor R28 is connected to the first terminal of resistor R29 and the first terminal of resistor R31. The second end of the resistor R29 and the first end of the capacitor C39 are connected to the second detection end of the Bluetooth audio module (101); The second end of resistor R31 and the second end of capacitor C39 are connected to the GND pin.

6. The Bluetooth headset system according to claim 1, characterized in that, The Bluetooth headset system also includes a power management module (107), which integrates at least one of a boost circuit, an overvoltage protection circuit, and an overcurrent protection circuit. The power management module (107) is connected to the Bluetooth audio module (101) and the digital audio interface module (104) respectively.

7. The Bluetooth headset system according to claim 6, characterized in that, The power management module (107) includes a management chip U4, a Hall switch U3, a button SW1, an inductor L4, LEDs D10, D11, and D12, a thermistor NTC2, resistors Riset1 and Riset2, resistors R7, R8, R10, R14, R15, and R18, and capacitors C28, C29, and C30. The first pin of the management chip U4 is connected to the first end of resistor R8, the first end of resistor Riset1, and the first end of resistor R7. The second end of resistor R7 is connected to the first end of button SW1. The second end of resistor R8 is connected to the positive terminal of light-emitting diode D10. The second pin of the management chip U4 is connected to the first end of resistor R10 and the first end of resistor Riset2. The second end of resistor Riset2 is connected to the Vout pin of the Hall switch. The second end of resistor R10 is connected to the positive terminal of light-emitting diode D11. The third pin of the management chip U4 is connected to the first terminal of the thermistor NTC2 and the first terminal of the resistor R15, and the second terminal of the resistor R15 is connected to the positive terminal of the light-emitting diode D12. The fifth pin of the management chip U4 is connected to the first end of the resistor R18 and then to the power output of the digital audio interface module (104); the second end of the resistor R18 is connected to the first end of the capacitor C30. The seventh pin of the management chip U4 is connected to the first terminal of the inductor L4; the sixth pin of the management chip U4, the second terminal of the inductor L4, and the first terminal of the capacitor C29 are all connected to the battery. The eighth pin of the management chip U4 is connected to the first end of capacitor C28 and the first end of resistor R14, and the second end of resistor R14 is connected to the DC power supply of Bluetooth audio module (101). The ninth and tenth pins of the management chip U4 are connected in series with a charging contact of a Bluetooth headset body (20) and then connected to the GND pin. The eleventh pin of the management chip U4, the VSS pin of the Hall switch, the second terminal of the button SW1, the second terminal of the resistor Riset1, the second terminal of the thermistor NTC2, the negative terminal of LED D10, the negative terminal of LED D11, the negative terminal of LED D12, the second terminal of capacitor C28, the second terminal of capacitor C29, and the second terminal of capacitor C30 are all connected to the GND pin.

8. The Bluetooth headset system according to claim 1, characterized in that, The wireless communication module (102) includes bidirectional diode D22, bidirectional diode D23, capacitor C53, capacitor C54, capacitor C55, capacitor C56, resistor R39, inductor L5 and antenna ANT. The signal output terminal of the Bluetooth audio module (101) is connected to the first terminal of the bidirectional diode D22, the first terminal of the capacitor C54 and the first terminal of the resistor R39. The first terminal of the resistor R39 is connected to the first terminal of the capacitor C53, the first terminal of the capacitor C56 and the first terminal of the inductor L5. The second terminal of the inductor L5 is connected to the first terminal of the capacitor C55, the first terminal of the bidirectional diode D23 and the first terminal of the antenna ANT. The second terminals of bidirectional diode D22, bidirectional diode D23, antenna ANT, capacitor C53, capacitor C54, capacitor C55, and capacitor C56 are all connected to the GND pin.

9. The Bluetooth headset system according to claim 1, characterized in that, The analog audio interface module (103) includes at least one analog audio interface, which is any one of a TRS interface, an XLR interface, and a TS interface.

10. The Bluetooth headset system according to claim 1, characterized in that, The digital audio interface module (104) includes at least one digital audio interface, which is any one of a Type-C interface, a Lightning interface, and a Type-A interface.

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