TWI652949B - Headset apparatus - Google Patents

Abstract

A headphone device includes a headphone body, a C-type universal serial bus bar and a control circuit. The C-type universal serial bus bar is coupled to the main body of the earphone and the external electronic device, and is used as a signal transmission interface between the main body of the earphone and the external electronic device. The control circuit is coupled to the C-type universal sequence bus bar and compares the voltage of the first power source from the external electronic device with the reference voltage. When the voltage of the first power source is greater than the reference voltage, the control circuit sets the C-type universal sequence bus bar to the digital interface mode, so that the earphone body and the external electronic device transmit the digital audio. When the voltage of the first power source is less than or equal to the reference voltage, the control circuit switches the C-type universal sequence bus 埠 to the analog interface mode, so that the headphone body and the external electronic device transmit analog audio.

Description

Earphone device

The present invention relates to an earphone device, and more particularly to an earphone device having a C-type universal serial bus bar with a digital interface mode and an analog interface mode automatic switching mechanism.

In general, the common earphone devices are mostly analog interface mode earphone devices, wherein the signals received or output by the analog interface mode earphone device are analog signals. However, with the development of technology, earphone devices having a digital interface mode and an analog interface mode have been developed, such as a C-type universal serial bus headphone device, in which a headphone device operating in a digital interface mode is received. Or the output signals are all digital signals. In general, the digital interface mode has the advantages of good sound effect and low noise interference, and is convenient for other additional functions (such as heartbeat detection, body data monitoring, active noise cancellation, etc.), but the digital interface mode must transmit better sound quality. The digital signal makes the external electronic device using the digital interface mode very power-hungry. Therefore, how to further improve and improve the consumer-oriented aspect, it is necessary for the relevant industry to constantly think about the important technical issues and objectives.

The invention provides an earphone device capable of supporting an analog interface mode and a digital interface mode, which can monitor the state of charge of an electronic device to which it is coupled, and can automatically and automatically connect the earphone device and the electronic device according to the state of charge of the electronic device. The interface between the devices is switched from the digital interface mode to the analog interface mode to extend the use time of the electronic device.

The earphone device of the present invention includes a headphone body, a C-type universal serial bus bar, and a control circuit. The C-type universal serial bus bar is coupled to the earphone body and is connected to the external electronic device as a signal transmission interface between the earphone body and the external electronic device. The control circuit includes a detection circuit and a switching resistance module. The detecting circuit is coupled to the C-type universal serial bus bar for receiving the first power source from the external electronic device and comparing the voltage of the first power source with the reference voltage. The switching resistor module is coupled to the detection circuit and the C-type universal serial bus. When the voltage of the first power source is greater than the reference voltage, the detecting circuit sets the C-type universal serial bus to the digital interface mode through the switching resistor module, so that the earphone body and the external electronic device transmit the digital audio. When the voltage of the first power source is less than or equal to the reference voltage, the detecting circuit switches the C-type universal sequence bus bar to the analog interface mode through the switching resistor module, so that the earphone body and the external electronic device transmit the analog audio.

In an embodiment of the invention, the detecting circuit changes the configured resistance value between the channel configuration pin of the C-type universal serial bus bar and the ground potential through the switching resistor module, so that the C-type universal sequence convergence Switch between digital interface mode and analog interface mode.

In an embodiment of the invention, when the configured resistance value is 5.1 kilo ohms, the C-type universal sequence bus is configured in a digital interface mode. When the configured resistance value is between 800 ohms and 1.2 kilo ohms, the C-type universal sequence bus 埠 is in the analog interface mode.

In an embodiment of the invention, the detecting circuit compares the voltage of the first power source with a reference voltage to generate a control signal. The switching resistor module is coupled between the channel configuration pin and the ground potential, wherein the resistance value of the switching resistor module is a configured resistance value, and the switching resistor module is controlled by the control signal to change the configured resistance value.

In an embodiment of the invention, when the C-type universal serial bus is set to the digital interface mode, the detecting circuit is connected to the B9 pin, the B4 pin, the A9 pin and the B9 through the C-type universal serial bus. At least one of the feet receives the first power source.

In an embodiment of the invention, when the C-type universal serial bus is set to the analog interface mode, the detecting circuit receives the second power from the external electronic device through the B8 pin of the C-type universal serial bus. The detection circuit includes a Schottky diode, a voltage dividing circuit, a first resistor, a transistor, a first diode, and a second diode. The anode of the Xiaoji diode receives the first power source. The cathode of the Xiaoji diode outputs the first adjustment voltage. The voltage dividing circuit is coupled to the cathode of the Schottky diode to receive the first adjustment voltage, and divides the first adjustment voltage to generate a second adjustment voltage. The first end of the first resistor is coupled to the cathode of the Schottky diode. The first end of the transistor is coupled to the second end of the first resistor. The control end of the transistor is coupled to the voltage dividing circuit to receive the second adjustment voltage, and the second end of the transistor is coupled to the ground potential. The anode of the first diode is coupled to the first end of the transistor. The anode of the second diode receives the second power source. The cathode of the second diode is coupled to the cathode of the first diode to generate a control signal.

In an embodiment of the invention, the channel configuration pin is an A5 pin of the C-type universal sequence bus. The switching resistor module includes a first resistor, a second resistor, and a transistor. The first end of the first resistor is coupled to the channel configuration pin. The second end of the first resistor is coupled to the ground potential. The first end of the second resistor is coupled to the first end of the first resistor. The first end of the transistor is coupled to the second end of the second resistor. The control terminal of the transistor receives the control signal. The second end of the transistor is coupled to a ground potential.

Based on the above, the earphone device of the embodiment of the present invention can monitor the state of charge of the external electronic device to which it is coupled, and can automatically interface the earphone device with the external electronic device in response to the state of charge of the external electronic device. Switch from digital interface mode to analog interface mode to extend the use time of external electronic devices. Since the power of the external electronic device is monitored by the earphone device, and the switching between the digital interface mode and the analog interface mode is controlled by the earphone device, the external electronic device does not need to execute a specific application to monitor its own power, nor does it The switching operation between the digital interface mode and the analog interface mode is performed, so that the electronic device can be prevented from generating additional power consumption due to the resident execution of the above application.

The above described features and advantages of the invention will be apparent from the following description.

In order to make the content of the present invention easier to understand, the following specific embodiments are examples of the invention that can be implemented. In addition, wherever possible, the same reference numerals in the FIGS.

Please refer to FIG. 1 , which is a circuit block diagram of a headset device 100 according to an embodiment of the invention. The earphone device 100 may include a headphone main body 120, a C-type universal serial bus bar 140, and a control circuit 160, but the present invention is not limited thereto. The C-type universal serial bus bar 140 is coupled to the earphone body 120. The C-type universal serial bus bar 140 can be used to connect with the external electronic device 900 as a signal transmission interface between the earphone body 120 and the external electronic device 900. In addition, the external electronic device 900 can provide the power source (for example, the first power source PM1 or the second power source PM2) required for the headphone body 120 to operate normally through the C-type universal serial bus bar 140.

In an embodiment of the present invention, the external electronic device 900 can be, for example, a mobile phone, a tablet computer, or a mobile music player having a C-type universal serial bus and capable of simultaneously supporting digital audio and analog audio output. Mobile electronic device, but the invention is not limited thereto. In an embodiment of the present invention, the earphone body 120 may be a known earphone body, which may include a sounding component for playing sound and/or a sound pickup component for capturing sound, and thus will not be described herein.

The control circuit 160 is coupled to the C-type universal sequence bus bar 140. The control circuit 160 can receive the first power source PM1 from the external electronic device 900 through the C-type universal sequence bus bar 140. In particular, as the external electronic device 900 continues to be used, the voltage variation curve of the first power source PM1 can be, for example, as shown in FIG. 2 (here, a 5 volt power source of a general-purpose serial bus bar is taken as an example, but the present invention does not The vertical axis is the voltage value of the first power source PM1, and the horizontal axis is the usage time of the external electronic device 900. As can be seen from FIG. 2, the voltage of the first power source PM1 decreases as the external electronic device 900 continues to be used. Therefore, the control circuit 160 can monitor the voltage of the first power source PM1 to determine the state of charge of the external electronic device 900.

In detail, the control circuit 160 can compare the voltage of the first power source PM1 with the reference voltage VT. When the voltage of the first power source PM1 is greater than the reference voltage VT, the control circuit 160 can determine that the power of the external electronic device 900 is sufficient, so the control circuit 160 can set the C-type universal sequence bus bar 140 to the digital interface mode. At this time, the earphone main body 120 and the external electronic device 900 can transmit digital audio.

In contrast, when the voltage of the first power source PM1 is less than or equal to the reference voltage VT, the control circuit 160 can determine that the power of the external electronic device 900 is insufficient, so the control circuit 160 can switch the C-type universal sequence bus bar 140 to the analog interface mode. And automatically turning off the additional functions of the digital interface mode (such as heartbeat detection, body data monitoring, active cancellation, etc.), thereby saving power consumption of the external electronic device 900, thereby extending the use of the external electronic device 900. time. At this time, the earphone main body 120 and the external electronic device 900 will transmit analog audio.

In an embodiment of the invention, the control circuit 160 can change the configured resistance value between the channel configuration pin C_PIN of the C-type universal sequence bus bar 140 and the ground potential GND, so that the C-type universal sequence bus bar 140 Switch between digital interface mode and analog interface mode.

Furthermore, the C-type universal serial bus 埠 140 of the present embodiment can be an existing C-type universal serial bus, and the biggest feature is that it can support the "positive and backward insertion" function that can be inserted on both sides. . Further, the existing C-type universal serial bus bar includes A side and B side, and each of the A side and the B side has 12 pins (ie, A1~A12 pins and B1~B12 pins). For a detailed description of the A1~A12 pin and the B1~B12 pin, refer to the existing C-type universal serial bus bar standard, and details are not described herein.

Please refer to Table 1 below. Table 1 lists the pins of the C-type universal serial bus 埠 140 of the earphone device 100 in the digital interface mode and the pin interface definition in the analog interface mode. In detail, in the digital interface mode, the A4 pin, the B4 pin, the A9 pin and the B9 pin of the C-type universal serial bus bar 140 are power pins; the A6 pin and the A7 pin are digital audio connections. Foot; A1 pin, B1 pin, A12 pin and B12 pin are ground pins; and A5 pin is the channel configuration pin C_PIN shown in Figure 1, used as digital interface mode and analog interface Mode switching pin. In addition, in the analog interface mode, the A6 pin and the A7 pin of the C-type universal serial bus 埠 140 are analog audio pins; the A5 pin is still the channel configuration pin C_PIN; the A8 pin is the ground pin; The B8 pin can be used as an analog audio pin and a power pin. Table 1

Therefore, when the C-type universal serial bus 140 is set to the digital interface mode, the earphone body 120 can pass through at least one of the A4 pin, the B4 pin, the A9 pin and the B9 pin of the C-type universal serial bus. The first power source PM1 from the external electronic device 900 is received as a power source for the earphone body 120. In addition, the earphone body 120 and the external electronic device 900 can transmit digital audio through the A6 pin and the A7 pin of the C-type universal serial bus bar 140.

In contrast, when the C-type universal sequence bus bar 140 is set to the analog interface mode, the earphone body 120 can receive the second power source PM2 from the external electronic device 900 through the B8 pin of the C-type universal serial bus bar 140. A source of power for the headphone body 120. In addition, the earphone body 120 and the external electronic device 900 can transmit analog audio through the A6 pin, the A7 pin and the B8 pin of the C-type universal serial bus bar 140, wherein the A6 pin can be used to transmit the right channel signal, and the A7 is connected. The foot can be used to transmit the left channel signal and the B8 pin can be used to transmit the microphone signal.

In an embodiment of the present invention, as shown in Table 1, when the A5 pin is grounded through a 5.1 kΩ resistor, it indicates that the C-type universal sequence bus bar 140 is set to the digital interface mode; when the A5 pin transmits 800 ohms When the ~1.2 kΩ resistor is grounded, it means that the C-type universal sequence bus bar 140 is set to the analog interface mode. Therefore, the external electronic device 900 can know whether the current operation mode is the digital interface mode or the analog interface mode according to the ground resistance value of the A5 pin of the C-type general-purpose bus bar 140.

Please refer to FIG. 1 and FIG. 3 simultaneously. FIG. 3 is a schematic block diagram of the control circuit 160 of FIG. The control circuit 160 can include a detection circuit 262 and a switching resistance module 264. The detecting circuit 262 can receive the first power source PM1 and compare the voltage of the first power source PM1 with the reference voltage VT to generate the control signal CS. The switching resistor module 264 is coupled between the channel configuration pin C_PIN and the ground potential GND. In particular, the resistance value of the switching resistor module 264 is the configured resistance value between the channel configuration pin C_PIN and the ground potential GND, and the switching resistor module 264 can be controlled by the control signal CS to change the configured resistance. value.

For example, when the detecting circuit 262 determines that the voltage of the first power source PM1 is greater than the reference voltage VT, the detecting circuit 262 can generate a logic low level control signal CS. The switching resistor module 264 can be controlled by the logic low level control signal CS to set the configured resistance value to 5.1 kilo ohms. In this way, the external electronic device 900 can configure the pin C_PIN (ie, the A5 pin) to have a ground resistance value of 5.1 kohm according to the channel configuration of the C-type universal serial bus bar 140, and know that the current operation mode is digital. Interface mode.

In contrast, once the detecting circuit 262 determines that the voltage of the first power source PM1 is less than or equal to the reference voltage VT, the detecting circuit 262 can generate a logic high level control signal CS. The switching resistor module 264 can be controlled by the logic high level control signal CS to switch the configuration resistance value from 5.1 kilo ohms to 800 ohms to 1.2 kilo ohms. In this way, the external electronic device 900 can be configured according to the channel configuration pin C_PIN (ie, the A5 pin) of the C-type universal serial bus bar 140, and the ground resistance value is between 800 ohms and 1.2 kilo ohms. The current mode of operation is the analog interface mode.

Incidentally, the relationship between the logic level of the control signal CS of the above example and the configured resistance value is only an example and is not intended to limit the present invention. It is well known in the art that the relationship between the logic level of the control signal CS and the configured resistance value can be defined by the designer according to actual needs.

Please refer to FIG. 1 , FIG. 3 and FIG. 4 simultaneously. FIG. 4 is a schematic diagram showing the circuit structure of the detecting circuit 262 and the switching resistor module 264 of FIG. 3 . When the C-type universal serial bus 140 is set to the digital interface mode, the detecting circuit 262 passes through at least one of the A4 pin, the B4 pin, the A9 pin and the B9 pin of the C-type universal serial bus bar 140. The first power source PM1 from the external electronic device 900 is received. When the C-type universal sequence bus bar 140 is set to the analog interface mode, the detecting circuit 262 receives the second power source PM2 from the external electronic device 900 through the B8 pin of the C-type universal sequence bus bar 140. The detecting circuit 262 may include a Schottky diode DS, a voltage dividing circuit 361, a first resistor R11, a transistor Q1, a first diode D1, and a second diode D2, but the invention is not limited thereto.

The anode of the Xiaoji diode DS receives the first power source PM1, and the cathode of the Xiaoji diode DS outputs a first adjustment voltage VD1. The voltage dividing circuit 361 is coupled to the cathode of the Schottky diode DS to receive the first adjustment voltage VD1 and divide the first adjustment voltage VD1 to generate the second adjustment voltage VD2. The first end of the first resistor R11 is coupled to the cathode of the Schottky diode DS. The first end of the transistor Q1 is coupled to the second end of the first resistor R11, the control end of the transistor Q1 is coupled to the voltage dividing circuit 361 to receive the second adjusting voltage VD2, and the second end of the transistor Q1 is coupled to Ground potential GND. The anode of the first diode D1 is coupled to the first end of the transistor Q1. The anode of the second diode D2 receives the second power source PM2, and the cathode of the second diode D2 is coupled to the cathode of the first diode D1 to generate a control signal CS.

In an embodiment of the invention, the transistor Q1 may be an NPN type bipolar junction transistor, but the invention is not limited thereto. In an embodiment of the invention, the voltage dividing circuit 361 may include a capacitor C1, a second resistor R12, a third resistor R13, and a voltage stabilizing diode DZ. The capacitor C1 is coupled between the cathode of the Schottky diode DS and the ground potential GND. The second resistor R12 is coupled between the cathode of the Schottky diode DS and the control terminal of the transistor Q1. The third resistor R13 is coupled between the control terminal of the transistor Q1 and the ground potential GND. The cathode of the Zener diode DZ is coupled to the control terminal of the transistor Q1, and the anode of the Zener diode DZ is coupled to the ground potential GND.

The switching resistor module 264 can include a first resistor R21, a second resistor R22, and a transistor Q2. The first end of the first resistor R21 is coupled to the channel configuration pin C_PIN, and the second end of the first resistor R21 is coupled to the ground potential GND. The first end of the second resistor R22 is coupled to the first end of the first resistor R21. The first end of the transistor Q2 is coupled to the second end of the second resistor R22. The control terminal of the transistor Q2 receives the control signal CS, and the second end of the transistor Q2 is coupled to the ground potential GND. In an embodiment of the present invention, the transistor Q2 may be an N-type MOS field effect transistor, the resistance of the first resistor R21 may be 5.1 kilo ohms, and the resistance of the second resistor R22 may be 1.2 kilo ohms. However, the invention is not limited thereto. The operation of the circuit of Fig. 4 will be described below.

When the voltage of the first power source PM1 is greater than the reference voltage VT, the second adjustment voltage VD2 generated by the first power source PM1 through the Schottky diode DS, the second resistor R12, and the third resistor R13 will be greater than the threshold voltage of the transistor Q1. Therefore, the transistor Q1 can be turned on and accordingly generate a logic low level control signal CS. The logic low level control signal CS can turn off the transistor Q2, so that the configured resistance value between the channel configuration pin C_PIN and the ground potential GND is substantially equal to the resistance value of the first resistor R21 (for example, 5.1 thousand ohm). Therefore, the C-type universal sequence bus 埠 140 is set to the digital interface mode.

The second power source PM1 transmits the second power source PM1, the second resistor R12, and the third resistor R13. The adjustment voltage VD2 will be less than the threshold voltage of the transistor Q1, so the transistor Q1 will be turned off and a logic high level control signal CS will be generated accordingly. The logic high level control signal CS can turn on the transistor Q2, so that the configured resistance value between the channel configuration pin C_PIN and the ground potential GND is substantially equal to the parallel connection of the first resistor R21 and the second resistor R22. Resistance (approximately 971 ohms, between 800 ohms and 1.2 kilo ohms). Therefore, the C-type universal sequence bus 埠 140 is set to the analog interface mode. At this time, the external electronic device 900 stops supplying the first power source PM1, but provides the second power source PM2 through the B8 pin of the C-type universal sequence bus bar 140. The second power source PM2 can provide a logic high level control signal CS to maintain the transistor Q2 in a conducting state, so that the configured resistance value between the channel configuration pin C_PIN and the ground potential GND is maintained at the first resistor R21 and the second The parallel resistance value of resistor R22 is such that the C-type universal sequence bus 埠 140 is maintained in the analog interface mode.

In another embodiment of the present invention, the detection circuit 262 of FIG. 3 can also be implemented by a common comparator or a micro-controller or the like, but the present invention does not. Limited to this, depending on the actual application or design needs.

In summary, the earphone device of the embodiment of the present invention can monitor the state of charge of the external electronic device to which it is coupled, and can automatically synchronize the earphone device with the external electronic device in response to the state of charge of the external electronic device. The interface is switched from digital interface mode to analog interface mode to extend the use time of external electronic devices. Since the power of the external electronic device is monitored by the earphone device, and the switching between the digital interface mode and the analog interface mode is controlled by the earphone device, the external electronic device does not need to execute a specific application to monitor its own power, nor does it The switching operation between the digital interface mode and the analog interface mode is performed, so that the external electronic device can be prevented from generating additional power consumption due to the resident execution of the above application.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧ headphone device

120‧‧‧ headphone body

140‧‧‧C type universal sequence bus arrangement

160‧‧‧Control circuit

262‧‧‧Detection circuit

264‧‧‧Switching resistance module

361‧‧‧voltage circuit

900‧‧‧External electronic devices

C1‧‧‧ capacitor

C_PIN‧‧‧ channel configuration pin

CS‧‧‧Control signal

D1‧‧‧First Diode

D2‧‧‧ second diode

DS‧‧‧Xiaoji diode

DZ‧‧‧ Regulators

GND‧‧‧ Ground potential

PM1‧‧‧First power supply

PM2‧‧‧second power supply

Q1, Q2‧‧‧O crystal

R11, R21‧‧‧ first resistance

R12, R22‧‧‧ second resistor

R13‧‧‧ third resistor

VD1‧‧‧First adjustment voltage

VD2‧‧‧second adjustment voltage

VT‧‧‧reference voltage

FIG. 1 is a circuit block diagram of a headphone device according to an embodiment of the invention. 2 is a schematic diagram showing a voltage variation curve of a first power source in the case where the external electronic device is continuously used according to an embodiment of the invention. 3 is a circuit block diagram of the control circuit of FIG. 1. 4 is a schematic diagram showing the circuit structure of the detecting circuit and the switching resistor module of FIG. 3.

Claims (8)

An earphone device includes: a headphone body; a C-type universal serial bus bar coupled to the earphone body and connected to an external electronic device as a signal between the earphone body and the external electronic device And a control circuit, comprising: a detecting circuit coupled to the C-type universal serial bus bar for receiving a first power source from the external electronic device, and a voltage of the first power source a reference voltage is compared; and a switching resistor module is coupled to the detection circuit and the C-type universal sequence bus, wherein when the voltage of the first power source is greater than the reference voltage, the detecting circuit transmits the The switching resistor module sets the C-type universal serial bus as a digital interface mode, so that the earphone body and the external electronic device transmit a digital audio, wherein when the voltage of the first power source is less than or equal to the reference voltage, The detecting circuit switches the C-type universal serial bus bar to an analog interface mode through the switching resistor module, so that the earphone body and the external electronic device transmit A type of analog audio, wherein the detecting circuit changes a configuration resistance value between a channel configuration pin of the C-type universal serial bus bar and a ground potential through the switching resistor module, so that the C-type universal sequence The bus is connected to the digital interface mode and the analog interface mode Switch between. The earphone device of claim 1, wherein: when the configured resistance value is 5.1 kilo ohms, the C-type universal sequence bus bar is the digital interface mode; and when the configured resistance value is between The C-type universal sequence bus 埠 is the analog interface mode from 800 ohms to 1.2 kilo ohms. The earphone device of claim 1, wherein the detecting circuit compares the voltage of the first power source with the reference voltage to generate a control signal; and the switching resistor module is coupled to the channel Between the configuration pin and the ground potential, wherein a resistance value of the switching resistance module is the configured resistance value, and the switching resistance module is controlled by the control signal to change the configured resistance value. The earphone device of claim 3, wherein: when the C-type universal serial bus is set to the digital interface mode, the detecting circuit transmits the A4 pin of the C-type universal serial bus, At least one of the B4 pin, the A9 pin and the B9 pin receives the first power source. The earphone device of claim 4, wherein when the C-type universal serial bus is set to the analog interface mode, the detecting circuit receives the B8 pin from the C-type universal serial bus. a second power source of the external electronic device, wherein the detecting circuit comprises: a Schottky diode, the anode of the Schottky diode receives the first power source, and the cathode output of the Schottky diode is Adjusting the voltage; a voltage dividing circuit, coupled to the cathode of the Schottky diode to receive the first adjustment voltage, and dividing the first adjustment voltage to generate a second adjustment voltage; a first resistor, the first a first end of a resistor is coupled to the cathode of the Schottky diode; a transistor, a first end of the transistor is coupled to a second end of the first resistor, and a control end of the transistor The voltage dividing circuit is coupled to receive the second adjusting voltage, and a second end of the transistor is coupled to the ground potential; a first diode, an anode of the first diode is coupled to the transistor The first end; and a second diode, the anode of the second diode receives the second power source, and the cathode of the second diode is coupled to the cathode of the first diode This control signal is generated. The earphone device of claim 5, wherein the transistor is an NPN type dual carrier junction transistor, wherein the voltage dividing circuit comprises: a capacitor coupled to the Schottky diode a cathode between the cathode and the control end of the transistor; a third resistor coupled to the transistor Between the control terminal and the ground potential; and a voltage stabilizing diode, the cathode of the voltage stabilizing diode is coupled to the control end of the transistor, and the anode of the voltage stabilizing diode is coupled to the ground potential. The earphone device of claim 3, wherein the channel configuration pin is an A5 pin of the C-type universal serial bus bar, wherein the switching resistor module comprises: a first resistor, the first a first end of the resistor is coupled to the channel configuration pin, and a second end of the first resistor is coupled to the ground potential; a second resistor is coupled to the first end of the second resistor a first end of the resistor; and a transistor, a first end of the transistor is coupled to a second end of the second resistor, a control end of the transistor receives the control signal, and one of the transistors The second end is coupled to the ground potential. The earphone device of claim 1, wherein: when the C-type universal serial bus is set to the digital interface mode, the earphone body transmits the A4 pin and the B4 of the C-type universal serial bus. At least one of the pin, the A9 pin and the B9 pin receives the first power source as a power source of the earphone body, and the earphone body and the external electronic device pass through the C-type universal serial bus. The A6 pin and the A7 pin transmit the digital audio; and when the C-type universal serial bus is set to the analog interface mode, the earphone body receives the B8 pin through the C-type universal serial bus a second power source of the external electronic device as the power supply source of the earphone body, and the earphone body and the external electronic device pass through the A6 pin of the C-type universal serial bus, the A7 pin and the The analog audio is transmitted by the B8 pin, wherein the A6 pin is used for transmitting a right channel signal, and the A7 pin is used for transmitting a left channel signal, and the The B8 pin is used to transmit a microphone signal.