Headphone circuit and headphone

Abstract

The present invention discloses an earphone circuit and an earphone, comprising a Bluetooth module, a main control module and a processing module. The Bluetooth module is used for sending and receiving audio signals fed back by an audio playback device and a microphone. The main control module is used for establishing a master / slave channel and performing corresponding processing on the audio signals fed back by the audio playback device, the microphone and the Bluetooth module based on the established master / slave channel and user requirements. The processing module is used for converting the audio signal into an analog signal required by an earphone amplifier.

Description

Technical Field

[0001] The present invention relates to the technical field of earphones, and in particular to an earphone circuit and an earphone. Background Art

[0002] People express their feelings and vent emotions through singing, which helps to improve people's negative emotions. As the demand increases, the number of mini KTVs increases accordingly. Because the internal area of ​​mini KTV is relatively small, the wired connection of headphones and microphones when two people sing together will bring inconvenience to users when using it, and the existing wired / wireless connections cannot adjust the singing mode according to user needs during karaoke. Therefore, a headphone circuit and headphone are proposed, which can automatically establish a master / slave channel when two headphones are used, and can process the audio signals fed back by the audio playback device, microphone, and Bluetooth module based on the established master / slave channel and user needs, replacing the external speaker to achieve green and environmental protection in terms of noise, increasing the applicability of the scene while allowing users to independently adjust the singing mode according to their needs. Summary of the invention

[0003] In view of the above technical problems, the purpose of the present invention is to provide a headphone circuit, including a Bluetooth module, a main control module, and a processing module. The Bluetooth module is used to send and receive audio signals fed back by an audio playback device and a microphone. The main control module is used to establish a master / slave channel and perform corresponding processing on the audio signals fed back by the audio playback device, the microphone, and the Bluetooth module based on the established master / slave channel and user requirements. The processing module is used to convert the audio signal into an analog signal required by the headphone amplifier.

[0004] Further, the main control module includes a first resistor R1, a second resistor R2, a third resistor R3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first operational amplifier U1, a second operational amplifier U2, a first MOS tube Q1, a second MOS tube Q2, a third triode Q3, a first connection terminal P1, a second connection terminal P2, a third connection terminal P3, and a fourth connection terminal P4 / 1, the first operational amplifier U1 in-phase terminal is connected to the first connection terminal P1, the first operational amplifier U1 inverting terminal and the second operational amplifier U2 inverting terminal, one end of the third resistor R3, and one end of the eighth resistor R8 are connected, the other end of the eighth resistor R8 is connected to the power supply, and the output end of the first operational amplifier U1 is connected to the first MO The gate of the S tube Q1, the in-phase end of the second operational amplifier U2, one end of the second resistor R2, and the fourth first connection end P4 / 1 are connected; the source of the first MOS tube Q1 is connected to one end of the first resistor R1 and the second connection end P2; the output end of the second operational amplifier U2 is connected to the gate of the second MOS tube Q2; the source of the second MOS tube Q2 is connected to the emitter of the third triode Q3 and one end of the fifth resistor R5; the base of the third triode Q3 is connected to one end of the seventh resistor R7 and the third connection end P3; the gate of the third triode Q3 is connected to one end of the sixth resistor R6; the other end of the first resistor R1, the other end of the second resistor R2, the other end of the third resistor R3, the other end of the fifth resistor R5, the other end of the sixth resistor R6, the other end of the seventh resistor R7 and the ground end are connected.

[0005] Furthermore, the main control module also includes a fourth operational amplifier U4, a fifth operational amplifier U5, a fourth MOS tube Q4, a fifth MOS tube Q5, a first input terminal IN / 1, a first output terminal OUT / 1, a fourth second connection terminal P4 / 2, a fifth first connection terminal P5 / 1, a fifth second connection terminal P5 / 2, and a sixth connection terminal P6. The fourth operational amplifier U4 is connected to the fifth second connection terminal P5 / 2, and the fourth operational amplifier U4 inverting terminal is connected to the first operational amplifier U1 inverting terminal and the fifth operational amplifier U5 inverting terminal. The fifth operational amplifier U5 is connected, the in-phase terminal of the fifth operational amplifier U5 is connected to the fourth second connection terminal P4 / 2, the output terminal of the fifth operational amplifier U5 is connected to the gate of the fourth MOS tube Q4 and the fifth first connection terminal P5 / 1, the source of the fourth MOS tube Q4 is connected to the sixth connection terminal P6, the drain of the fourth MOS tube Q4 is connected to the first input terminal IN / 1, the output terminal of the fourth operational amplifier U4 is connected to the gate of the fifth MOS tube Q5, the drain of the fifth MOS tube Q5 is connected to the second connection terminal P2, and the source of the fifth MOS tube Q5 is connected to the first output terminal OUT / 1.

[0006] Furthermore, the main control module also includes a third operational amplifier U3, a sixth MOS tube Q6, a seventh MOS tube Q7, an eighth MOS tube Q8, a ninth MOS tube Q9, a second input terminal IN / 2, a second output terminal OUT / 2, a seventh connection terminal P7, an eighth connection terminal P8, a ninth connection terminal P9, a tenth connection terminal P10, and a second diode D2. The third operational amplifier U3 in-phase terminal is connected to the tenth connection terminal P10, the third operational amplifier U3 inverting terminal is connected to the fourth operational amplifier U4 inverting terminal, the third operational amplifier U3 output terminal is connected to the second diode D2 anode, the second diode D2 cathode and the third triode Q3 base The gate of the sixth MOS tube Q6 is connected to the gate of the fifth MOS tube Q5, the source of the sixth MOS tube Q6 is connected to the second output terminal OUT / 2, the gate of the seventh MOS tube Q7 is connected to the gate of the fourth MOS tube Q4, the drain of the seventh MOS tube Q7 is connected to the drain of the ninth MOS tube Q9 and the second input terminal IN / 2, the source of the seventh MOS tube Q7 is connected to the source of the second MOS tube Q2 and the drain of the eighth MOS tube Q8, the source of the eighth MOS tube Q8 is connected to the eighth connection terminal P8, the gate of the eighth MOS tube Q8 is connected to the gate of the ninth MOS tube Q9 and the seventh connection terminal P7, and the source of the ninth MOS tube Q9 is connected to the ninth connection terminal P9.

[0007] Furthermore, the main control module further includes a ninth resistor R9, one end of the ninth resistor R9 is connected to the gate of the fifth MOS tube Q5, and the other end of the ninth resistor R9 is connected to the ground.

[0008] Furthermore, the main control module further includes a tenth resistor R10, one end of the tenth resistor R10 is connected to the gate of the seventh MOS tube Q7, and the other end of the tenth resistor R10 is connected to the ground.

[0009] Furthermore, the main control module also includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the gate of the second MOS tube Q2, and the other end of the fourth resistor R4 is connected to the ground.

[0010] Furthermore, the main control module further includes an eleventh resistor R11, one end of the eleventh resistor R11 is connected to the gate of the eighth MOS transistor Q8, and the other end of the eleventh resistor R11 is connected to the ground.

[0011] Furthermore, the main control module further includes a first light emitting diode D1, wherein an anode of the first light emitting diode D1 is connected to an anode of the second diode D2, and a cathode of the first light emitting diode D1 is connected to a ground terminal.

[0012] Furthermore, the earphone includes the above-mentioned earphone circuit.

[0013] The beneficial effects of the present invention compared with the prior art are:

[0014] The present invention can automatically establish a master / slave channel when two pairs of headphones are used, and can process the audio signals fed back by the audio playback device, microphone, and Bluetooth module based on the established master / slave channel and the user's needs, thereby replacing the external speakers to achieve green and environmental protection in terms of noise, increasing the applicability of scenes while allowing the user to independently adjust the singing mode according to needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure of the earphone circuit provided by the present invention.

[0017] Figure 2 This is a schematic diagram of the circuit structure of the main control module provided by the present invention. DETAILED DESCRIPTION

[0018] In order to make the objects and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0019] The present invention discloses an earphone circuit, comprising a Bluetooth module, a main control module and a processing module. The Bluetooth module is used for sending and receiving audio signals fed back by an audio playback device and a microphone. The main control module is used for establishing a master / slave channel and performing corresponding processing on the audio signals fed back by the audio playback device, the microphone and the Bluetooth module based on the established master / slave channel and user requirements. The processing module is used for converting the audio signal into an analog signal required by an earphone amplifier.

[0020] Specifically, the main control module includes a first resistor R1, a second resistor R2, a third resistor R3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first operational amplifier U1, a second operational amplifier U2, a first MOS tube Q1, a second MOS tube Q2, a third triode Q3, a first connection terminal P1, a second connection terminal P2, a third connection terminal P3, and a fourth connection terminal P4 / 1, wherein the first operational amplifier U1 in-phase terminal is connected to the first connection terminal P1, the first operational amplifier U1 inverting terminal is connected to the second operational amplifier U2 inverting terminal, one end of the third resistor R3, and one end of the eighth resistor R8 are connected, and the other end of the eighth resistor R8 is connected to the power supply, and the output end of the first operational amplifier U1 is connected to the first MOS tube The gate of Q1, the in-phase terminal of the second operational amplifier U2, one end of the second resistor R2, and the fourth first connection terminal P4 / 1 are connected; the source of the first MOS tube Q1 is connected to one end of the first resistor R1 and the second connection terminal P2; the output end of the second operational amplifier U2 is connected to the gate of the second MOS tube Q2; the source of the second MOS tube Q2 is connected to the emitter of the third triode Q3 and one end of the fifth resistor R5; the base of the third triode Q3 is connected to one end of the seventh resistor R7 and the third connection terminal P3; the gate of the third triode Q3 is connected to one end of the sixth resistor R6; the other end of the first resistor R1, the other end of the second resistor R2, the other end of the third resistor R3, the other end of the fifth resistor R5, the other end of the sixth resistor R6, and the other end of the seventh resistor R7 are connected to the ground terminal.

[0021] Specifically, the main control module also includes a fourth operational amplifier U4, a fifth operational amplifier U5, a fourth MOS tube Q4, a fifth MOS tube Q5, a first input terminal IN / 1, a first output terminal OUT / 1, a fourth second connection terminal P4 / 2, a fifth first connection terminal P5 / 1, a fifth second connection terminal P5 / 2, and a sixth connection terminal P6. The fourth operational amplifier U4 is connected to the fifth second connection terminal P5 / 2, and the fourth operational amplifier U4 inverting terminal is connected to the inverting terminal of the first operational amplifier U1 and the inverting terminal of the fifth operational amplifier U5. The in-phase terminal of the fifth operational amplifier U5 is connected to the fourth second connection terminal P4 / 2, the output terminal of the fifth operational amplifier U5 is connected to the gate of the fourth MOS tube Q4 and the fifth first connection terminal P5 / 1, the source of the fourth MOS tube Q4 is connected to the sixth connection terminal P6, the drain of the fourth MOS tube Q4 is connected to the first input terminal IN / 1, the output terminal of the fourth operational amplifier U4 is connected to the gate of the fifth MOS tube Q5, the drain of the fifth MOS tube Q5 is connected to the second connection terminal P2, and the source of the fifth MOS tube Q5 is connected to the first output terminal OUT / 1.

[0022] Specifically, the main control module also includes a third operational amplifier U3, a sixth MOS tube Q6, a seventh MOS tube Q7, an eighth MOS tube Q8, a ninth MOS tube Q9, a second input terminal IN / 2, a second output terminal OUT / 2, a seventh connection terminal P7, an eighth connection terminal P8, a ninth connection terminal P9, a tenth connection terminal P10, and a second diode D2. The third operational amplifier U3 in-phase terminal is connected to the tenth connection terminal P10, the third operational amplifier U3 inverting terminal is connected to the fourth operational amplifier U4 inverting terminal, the third operational amplifier U3 output terminal is connected to the second diode D2 anode, the second diode D2 cathode and the third transistor Q3 base The gate of the sixth MOS tube Q6 is connected to the gate of the fifth MOS tube Q5, the source of the sixth MOS tube Q6 is connected to the second output terminal OUT / 2, the gate of the seventh MOS tube Q7 is connected to the gate of the fourth MOS tube Q4, the drain of the seventh MOS tube Q7 is connected to the drain of the ninth MOS tube Q9 and the second input terminal IN / 2, the source of the seventh MOS tube Q7 is connected to the source of the second MOS tube Q2 and the drain of the eighth MOS tube Q8, the source of the eighth MOS tube Q8 is connected to the eighth connection terminal P8, the gate of the eighth MOS tube Q8 is connected to the gate of the ninth MOS tube Q9 and the seventh connection terminal P7, and the source of the ninth MOS tube Q9 is connected to the ninth connection terminal P9.

[0023] Specifically, the main control module further includes a ninth resistor R9, one end of the ninth resistor R9 is connected to the gate of the fifth MOS tube Q5, and the other end of the ninth resistor R9 is connected to the ground end.

[0024] Specifically, the main control module further includes a tenth resistor R10, one end of the tenth resistor R10 is connected to the gate of the seventh MOS tube Q7, and the other end of the tenth resistor R10 is connected to the ground end.

[0025] Specifically, the main control module further includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the gate of the second MOS tube Q2, and the other end of the fourth resistor R4 is connected to the ground end.

[0026] Specifically, the main control module further includes an eleventh resistor R11, one end of the eleventh resistor R11 is connected to the gate of the eighth MOS transistor Q8, and the other end of the eleventh resistor R11 is connected to the ground.

[0027] Specifically, the main control module further includes a first light emitting diode D1, wherein the anode of the first light emitting diode D1 is connected to the anode of the second diode D2, and the cathode of the first light emitting diode D1 is connected to the ground terminal.

[0028] Specifically, the earphone includes the earphone circuit provided by any embodiment of the present invention.

[0029] The specific working principle of the present invention is as follows: when any earphone is turned on and connected to an audio device through a Bluetooth module, the audio playback device and the microphone feed back an audio signal to the Bluetooth module in the earphone, and at the same time, the Bluetooth module feeds back an audio device connection signal to the first connection terminal P1 on the main control module, the power signal passes through the eighth resistor R8 and the third resistor R3 to the grounding terminal loop, the third resistor R3 terminal signal is fed back to the inverting terminal of the first operational amplifier U1, the first operational amplifier U1 outputs, the first operational amplifier U1 output terminal signal table is the audio playback device main channel start signal, the first operational amplifier U1 output terminal signal is fed back to the first MOS tube Q1 gate, the second resistor R2 discharges the first MOS tube Q1 gate parasitic capacitance, the first MOS tube Q1 is turned on, the first MOS tube Q1 is turned on to turn on the channel, the audio signal fed back by the audio playback device is fed back to the main control module after passing through the Bluetooth module, the signal passes through the first MOS tube Q1 drain, the first MOS tube Q1 source, and the first resistor R1 to the grounding terminal loop, the first resistor R1 terminal signal is fed back to the processing module through the second connection terminal P2, the processing module processes the audio signal and then feeds it back to the ear amplifier, and at the same time The output signal of the first operational amplifier U1 is fed back to the in-phase terminal of the second operational amplifier U2, and the signal of the third resistor R3 is fed back to the inverting terminal of the second operational amplifier U2. The output signal of the second operational amplifier U2 is the main channel opening signal of the first microphone audio signal. The signal is fed back to the gate of the second MOS tube Q2, and the second MOS tube Q2 is turned on. The second MOS tube Q2 is turned on to open the channel. The audio signal fed back by the microphone is fed back to the main control module after passing through the Bluetooth module. The signal is fed back through the drain of the second MOS tube Q2, the source of the second MOS tube Q2, and the fifth resistor R3. R5 to the grounding loop, the signal at the end of the fifth resistor R5 is connected to the grounding loop via the emitter of the third transistor Q3, the base of the third transistor Q3, and the sixth resistor R6, the third transistor Q3 is turned on, the emitter signal of the third transistor Q3 is connected to the grounding loop via the collector of the third transistor Q3 and the seventh resistor R7, the signal at the end of the seventh resistor R7 is fed back to the processing module via the third connecting terminal P3, the processing module processes it and then feeds it back to the headphone amplifier, thereby opening the channel channels of the two groups of audio signals when only one pair of headphones is connected to the audio playback device and the microphone, so that the user can sing independently.

[0030] When the other headset is turned on, the two groups of Bluetooth modules establish an internal channel connection, and the signal at the fourth first connection terminal P4 / 1 is fed back to the fourth second connection terminal P4 / 2 on the main control module through the internal channel. When the two groups of Bluetooth modules establish an internal channel, any Bluetooth module obtains the signal feedback from the fourth first connection terminal P4 / 1 and limits the establishment authority of other channels on the Bluetooth module so that the Bluetooth module can only communicate in the internal channel. The signal at the fourth second connection terminal P4 / 2 is fed back to the in-phase terminal of the fifth operational amplifier U5, and the signal at the third resistor R3 is fed back to the inverting terminal of the fifth operational amplifier U5, and the fifth operational amplifier U5 outputs. The signal at the output terminal of the fifth operational amplifier U5 is a slave channel start signal, and the signal is fed back to the gate of the fourth MOS tube Q4, and the fourth MOS tube Q4 is turned on. The fourth MOS tube Q4 is turned on to start the slave channel. At the same time, the slave channel start signal passes through the fifth first connection terminal P5 / 1 and then passes through the internal signal The signal of the main channel is fed back to the fifth second connection terminal P5 / 2 on the main control module, the signal of the fifth second connection terminal P5 / 2 is fed back to the non-inverting terminal of the fourth operational amplifier U4, the signal of the third resistor R3 is fed back to the inverting terminal of the fourth operational amplifier U4, the fourth operational amplifier U4 outputs, the signal of the output terminal of the fourth operational amplifier U4 is fed back to the gate of the fifth MOS tube Q5, the fifth MOS tube Q5 is turned on, the main channel signal passes through the first resistor R1 end signal, the fifth MOS tube Q5 drain, the fifth MOS tube Q5 source, and the first output terminal OUT / 1, and then is fed back to the first input terminal IN / 1 on the other main control module through the internal channel, and the signal of the first input terminal IN / 1 is fed back to the processing module on the earphone through the fourth MOS tube Q4 drain, the fourth MOS tube Q4 source, and the sixth connection terminal P6, so that when the two sets of earphones are turned on, the master / slave channel is established so that the two sets of earphones can obtain the audio signal fed back by the audio device.

[0031] The output signal of the fourth operational amplifier U4 is synchronously fed back to the gate of the sixth MOS tube Q6. When the fourth operational amplifier U4 outputs, the sixth MOS tube Q6 is turned on, and the sixth MOS tube Q6 is turned on to start the main channel opening channel of the second microphone. The output signal of the fifth operational amplifier U5 is synchronously fed back to the gate of the seventh MOS tube Q7. When the fifth operational amplifier U5 outputs, the seventh MOS tube Q7 is turned on, and the seventh MOS tube Q7 is turned on to start the slave channel opening channel of the second microphone. When the Bluetooth module with the channel establishment authority establishes a channel connection with the second microphone, the audio signal fed back by the second microphone is fed back to the main control module through the Bluetooth module. The signal is fed back to the second input terminal IN / 2 on the other main control module through the internal channel after passing through the drain of the sixth MOS tube Q6, the source of the sixth MOS tube Q6, and the second output terminal OUT / 2. The signal of the second input terminal IN / 2 is fed back to the processing module through the drain of the seventh MOS tube Q7, the source of the seventh MOS tube Q7, the emitter of the third triode Q3, and the third connection terminal P3, so that the two headphones can obtain the audio signal fed back by the same audio playback device while enabling the user to perform independent singing in a competitive manner.

[0032] The chorus mode signal is fed back by the user, and the signal is fed back to the seventh connection terminal P7 of the main control module. The signal at the seventh connection terminal P7 is fed back to the gate of the eighth MOS tube Q8 and the gate of the ninth MOS tube Q9, and the eighth MOS tube Q8 and the ninth MOS tube Q9 are turned on. When the two headphones start the chorus mode, the signal at the end of the fifth resistor R5 is fed back to the processing module through the internal channel after passing through the drain of the eighth MOS tube Q8, the source of the eighth MOS tube Q8, and the eighth connection terminal P8. The signal at the drain end of the seventh MOS tube Q7 is fed back to the processing module through the internal channel after passing through the drain of the ninth MOS tube Q9, the source of the ninth MOS tube Q9, and the ninth connection terminal P9. In this way, in the chorus mode, the two headphones can obtain the audio signals fed back by the two microphones so that the users can sing in chorus.

[0033] The earphone return off signal is fed back by the user, and the signal is fed back to the tenth connection terminal P10 on the main control module. The signal at the third resistor R3 end is fed back to the inverting end of the third operational amplifier U3. When the tenth connection terminal P10 obtains the earphone return off signal, the third operational amplifier U3 outputs, and the output terminal signal of the third operational amplifier U3 is looped to the ground terminal through the second diode D2 and the sixth resistor R6. The third transistor Q3 is cut off and cuts off the signal feedback of the third connection terminal P3, so as to shield the audio signal fed back by itself in the solo / chorus mode. At the same time, the output terminal signal of the third operational amplifier U3 is looped to the ground terminal through the first light-emitting diode D1, and the first light-emitting diode D1 is turned on. The conduction indicator of the first light-emitting diode D1 is the signal indicator of the earphone return off, so as to replace the external speaker to achieve green environmental protection in terms of noise, increase the applicability of the scene, and enable the user to adjust the singing mode according to their needs.

[0034] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A headphone circuit, It is characterized in that It includes a Bluetooth module, a main control module, and a processing module. The Bluetooth module is used to send and receive audio signals fed back by an audio playback device and a microphone. The main control module is used to establish a master channel and a slave channel and to process the audio signals fed back by the audio playback device, the microphone, and the Bluetooth module based on the established master channel and slave channel and user requirements. The processing module is used to convert the audio signal into an analog signal required by the headphone amplifier. The main control module includes a first resistor, a second resistor, a third resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first operational amplifier, a second operational amplifier, a first MOS tube, a second MOS tube, a third triode, a first connection end, a second connection end, a third connection end, and a fourth first connection end, wherein the in-phase end of the first operational amplifier is connected to the first connection end, the inverting end of the first operational amplifier and the inverting end of the second operational amplifier, one end of the third resistor, and one end of the eighth resistor are connected, and the other end of the eighth resistor is connected to a power supply, the output end of the first operational amplifier is connected to the gate of the first MOS tube, the in-phase end of the second operational amplifier, one end of the second resistor, and the fourth first connection end, the source of the first MOS tube is connected to one end of the first resistor and the second connection end, the output end of the second operational amplifier is connected to the gate of the second MOS tube, the source of the second MOS tube is connected to the emitter of the third triode and one end of the fifth resistor, the base of the third triode is connected to one end of the seventh resistor and the third connection end, the gate of the third triode is connected to one end of the sixth resistor, and the other end of the first resistor, the other end of the second resistor, the other end of the third resistor, the other end of the fifth resistor, the other end of the sixth resistor, and the other end of the seventh resistor are connected to the ground end; When any earphone is turned on and connected to the audio device through the Bluetooth module, the audio playback device and the microphone feed back the audio signal to the Bluetooth module in the earphone, and at the same time, the Bluetooth module feeds back the audio device connection signal to the first connection end on the main control module, the first operational amplifier outputs, the first operational amplifier output end signal table is the audio playback device main channel start signal, the second operational amplifier output end signal table is the first microphone audio signal main channel channel start signal, the seventh resistor end signal is fed back to the processing module via the third connection end, the processing module processes it and then feeds back to the headphone amplifier, after the other earphone is turned on, when the two groups of Bluetooth modules establish an internal channel, any Bluetooth module obtains the fourth connection end signal feedback while limiting the remaining channel establishment authority on the Bluetooth module so that the Bluetooth module can only communicate in the internal channel; The main control module also includes a fourth operational amplifier, a fifth operational amplifier, a fourth MOS tube, a fifth MOS tube, a first input terminal, a first output terminal, a fourth second connection terminal, a fifth first connection terminal, a fifth second connection terminal, and a sixth connection terminal. The fourth operational amplifier in-phase terminal is connected to the fifth second connection terminal, the fourth operational amplifier inverting terminal is connected to the first operational amplifier inverting terminal and the fifth operational amplifier inverting terminal, the fifth operational amplifier in-phase terminal is connected to the fourth second connection terminal, the fifth operational amplifier output terminal is connected to the fourth MOS tube grid and the fifth first connection terminal, the fourth MOS tube source is connected to the sixth connection terminal, the fourth MOS tube drain is connected to the first input terminal, the fourth operational amplifier output terminal is connected to the fifth MOS tube grid, the fifth MOS tube drain is connected to the second connection terminal, and the fifth MOS tube source is connected to the first output terminal; The main channel signal is fed back to the first input terminal of another main control module through the internal channel after passing through the first output terminal, and the first input terminal signal is fed back to the processing module on the earphone through the sixth connection terminal, so that when the two sets of earphones are turned on, the main channel and the slave channel are established so that the two sets of earphones can obtain the audio signal fed back by the audio device; When the Bluetooth module with channel establishment authority establishes a channel connection with the second microphone, the audio signal fed back by the second microphone is fed back to the main control module via the Bluetooth module, and the signal is fed back to the second input terminal on the other main control module via the internal channel. The second input terminal signal is fed back to the processing module via the third connection terminal, so that the two headphones can obtain the audio signal fed back by the same audio playback device while enabling the user to perform independent singing in a competitive manner. The chorus mode signal is fed back by the user, and the signal is fed back to the seventh connection terminal of the main control module. When the two headphones turn on the chorus mode, the fifth resistor terminal signal is fed back to the processing module through the internal channel after the eighth connection terminal, and the seventh MOS tube drain terminal signal is fed back to the processing module through the internal channel after the ninth connection terminal. In this way, in the chorus mode, both headphones can obtain the audio signals fed back by the two microphones so that the user can sing in chorus. The headphone amplifier off signal is fed back by the user, and the signal is fed back to the tenth connection terminal on the main control module. The third transistor is cut off and cuts off the signal feedback of the third connection terminal, so as to shield the audio signal fed back by itself in the solo or chorus mode.

2. The earphone circuit according to claim 1, It is characterized in that The main control module also includes a third operational amplifier, a sixth MOS tube, a seventh MOS tube, an eighth MOS tube, a ninth MOS tube, a second input end, a second output end, a seventh connection end, an eighth connection end, a ninth connection end, a tenth connection end, and a second diode. The third operational amplifier in-phase end is connected to the tenth connection end, the third operational amplifier inverting end is connected to the fourth operational amplifier inverting end, the third operational amplifier output end is connected to the anode of the second diode, the cathode of the second diode is connected to the base of the third triode, the sixth MOS tube grid is connected to the fifth MOS tube grid, the sixth MOS tube source is connected to the second output end, the seventh MOS tube grid is connected to the fourth MOS tube grid, the seventh MOS tube drain is connected to the ninth MOS tube drain and the second input end, the seventh MOS tube source is connected to the second MOS tube source and the eighth MOS tube drain, the eighth MOS tube source is connected to the eighth connection end, the eighth MOS tube grid is connected to the ninth MOS tube grid and the seventh connection end, and the ninth MOS tube source is connected to the ninth connection end.

3. The earphone circuit according to claim 1, It is characterized in that The main control module also includes a ninth resistor, one end of the ninth resistor is connected to the gate of the fifth MOS tube, and the other end of the ninth resistor is connected to the ground end.

4. The earphone circuit according to claim 2, It is characterized in that The main control module also includes a tenth resistor, one end of the tenth resistor is connected to the gate of the seventh MOS tube, and the other end of the tenth resistor is connected to the ground end.

5. The earphone circuit according to claim 1, It is characterized in that The main control module also includes a fourth resistor, one end of the fourth resistor is connected to the gate of the second MOS tube, and the other end of the fourth resistor is connected to the ground.

6. The earphone circuit according to claim 2, It is characterized in that The main control module also includes an eleventh resistor, one end of the eleventh resistor is connected to the gate of the eighth MOS tube, and the other end of the eleventh resistor is connected to the ground end.

7. The earphone circuit according to claim 2, It is characterized in that The main control module further includes a first light emitting diode, wherein the anode of the first light emitting diode is connected to the anode of the second diode, and the cathode of the first light emitting diode is connected to the ground terminal.

8. An earphone, comprising the earphone circuit according to any one of claims 1 to 7.

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