CN106331927B

CN106331927B - Audio equipment

Info

Publication number: CN106331927B
Application number: CN201610818212.XA
Authority: CN
Inventors: 张凯
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Techology Co Ltd
Priority date: 2016-09-09
Filing date: 2016-09-09
Publication date: 2023-03-14
Anticipated expiration: 2036-09-09
Also published as: CN106331927A

Abstract

The invention discloses audio equipment, which comprises a left sound channel loudspeaker, a right sound channel loudspeaker, a 3.5mm socket, a USB socket, a decoding unit, a control unit and a gating unit, wherein the 3.5mm socket is provided with a left sound channel elastic sheet and a right sound channel elastic sheet which are respectively connected to a first input end and a second input end of the gating unit; the decoding unit is configured to perform digital-to-analog conversion processing on the differential digital signals transmitted by the USB socket to obtain analog left channel signals and analog right channel signals, and transmit the analog left channel signals and the analog right channel signals to a third input end and a fourth input end of the gating unit, respectively; the control unit is configured to control the gating state of the gating unit according to a connection state of the 3.5mm socket and the USB socket. The audio equipment realizes the compatibility of the USB interface and the 3.5mm interface on the audio equipment.

Description

Audio equipment

Technical Field

The invention relates to the technical field of audio equipment, in particular to audio equipment provided with a 3.5mm socket and a USB socket.

Background

Along with the cell-phone of taking the Type-C interface increases gradually, the Type-C interface can compatible audio signal, supports the audio equipment of Type-C interface also more and more, but Type-C interface audio equipment is different with standard 3.5mm interface audio equipment's interface, can only independent utility separately, mutually incompatible.

Due to the application of the new technology, the defect of universality is caused, and the situation that the Type-C interface earphone and the 3.5mm interface earphone exist simultaneously is caused due to the rapid updating of the new technology and the old technology.

Many audio devices on the market today are not capable of accommodating new Type-C interface electronic devices. However, the latest Type-C interface only with the Type-C interface cannot be compatible with the electronic equipment without the Type-C interface, and cannot be compatible, so that resource waste is formed.

Disclosure of Invention

It is an object of embodiments of the present invention to provide an audio device provided with a 3.5mm socket, a USB socket.

According to a first aspect of the present invention, there is provided an audio device, comprising a left channel speaker, a right channel speaker, a 3.5mm socket, a USB socket, a decoding unit, a control unit, and a gating unit, wherein the 3.5mm socket has a left channel spring and a right channel spring, and the left channel spring and the right channel spring are respectively connected to a first input terminal and a second input terminal of the gating unit; the decoding unit is configured to perform digital-to-analog conversion processing on the differential digital signal transmitted by the USB socket to obtain an analog left channel signal and an analog right channel signal, and transmit the analog left channel signal and the analog right channel signal to a third input end and a fourth input end of the gating unit, respectively; the control unit is configured to control a gating state of the gating unit according to a connection state of the 3.5mm socket and the USB socket to select one input terminal of the gating unit as a left channel input terminal to be connected to the left channel speaker and another input terminal of the gating unit as a right channel input terminal to be connected to the right channel speaker.

Optionally, the audio device further includes a bluetooth chip, the bluetooth chip is configured to demodulate and perform analog-to-digital conversion on the received radio frequency signal to obtain a demodulated left channel signal and a demodulated right channel signal, and transmit the demodulated left channel signal and the demodulated right channel signal to a fifth input end and a sixth input end of the gating unit, respectively, and the control unit is further configured to control the gating state of the gating unit according to a connection state of the bluetooth chip.

Optionally, the audio device further includes a battery and a charging chip, and the charging chip is configured to charge the battery according to a power supply provided by a power pin of the USB socket.

Optionally, the audio device further includes a power amplifier unit, and the power amplifier unit is configured to amplify the signal input by the left channel input end and transmit the amplified signal to the left channel speaker, and amplify the signal input by the right channel input end and transmit the amplified signal to the right channel speaker.

Optionally, the audio device further includes a first filtering unit and a second filtering unit, where the first filtering unit is configured to filter a signal input by the left channel dome and transmit the filtered signal to the first input end; the second filtering unit is configured to filter a signal input by the right channel elastic sheet and transmit the filtered signal to the second input end.

Optionally, the first filtering unit includes a first inductor and a first capacitor connected in series between the left channel elastic piece and the first input terminal, and a first resistor and a second capacitor connected in parallel between a potential point between the first inductor and the first capacitor and a ground terminal.

Optionally, the second filtering unit includes a second inductor and a third capacitor connected in series between the right channel spring and the second input terminal, and a second resistor and a fourth capacitor connected in parallel between a potential point between the second inductor and the third capacitor and a ground terminal.

Optionally, the USB socket at least includes any one of a USB a-Type socket, a micro USB socket, a mini USB socket, and a Type-C socket.

Optionally, the control unit is provided by an MCU.

Optionally, the gating unit is provided by two one-out-of-four selectors.

The inventor of the present invention finds that, in the prior art, there is a problem that the existing USB interface of the audio device and the 3.5mm interface are not compatible. In the embodiment of the invention, the gating state of the gating unit is controlled by detecting the connection state of the 3.5mm socket and the USB socket, so that the compatibility of the USB interface and the 3.5mm interface on the audio equipment is realized. Therefore, the technical task to be achieved or the technical problems to be solved by the present invention are never thought or anticipated by those skilled in the art, so the present invention is a new technical solution.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a block schematic diagram of an implementation structure of an audio device according to the present invention;

FIG. 2 is a schematic circuit diagram of an embodiment of a 3.5mm connection status detection circuit of an audio device according to the present invention;

fig. 3 is a block schematic diagram of another implementation structure of an audio device according to the present invention.

Description of the reference numerals:

u1: a control unit; u2: a gating unit;

u3: a decoding unit; U4-Bluetooth chip;

u5: a charging chip; u6: a power amplifier unit;

u7: a first filtering unit; u8: a second filtering unit;

j1: a 3.5mm socket; j2: a USB socket;

l: a left sound channel spring plate of a 3.5mm socket; r: a right channel spring plate of a 3.5mm socket;

f: a fixed spring plate of a 3.5mm socket; u9: a detection circuit;

d + and D-: a differential pin of the USB socket; VBUS: a power pin of the USB socket;

GND1: a grounding pin of the USB socket; GND: a ground terminal;

LE: a left ear piece; RE: a right ear piece;

battery: a battery; VDD: a power supply terminal;

LEFT1: a left channel signal; RIGHT1: a right channel signal;

LEFT2: simulating a left channel signal; RIGHT2: simulating a right channel signal;

LEFT3: demodulating the left channel signal; RIGHT3: demodulating the right channel signal;

s1: connecting a signal; l1, L2, L3: an inductance;

c1, C2, C3, C4, C5: a capacitor; r1, R2, R3, R4, R5, R6: a resistance;

in1, in2, in3, in4, in5, in6: an input terminal of the gating unit.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

In order to solve the problem that the USB interface and the 3.5mm interface in the prior art cannot be compatible with each other on an audio device, an audio device is provided, as shown in fig. 1, including a left channel speaker LE, a right channel speaker RE, a 3.5mm socket J1, a USB socket J2, a decoding unit U3, a control unit U1, and a gating unit U2; the 3.5mm socket J1 is provided with a LEFT sound channel shrapnel L and a RIGHT sound channel shrapnel R, and further comprises a grounding shrapnel G and a fixed shrapnel for being in contact connection with the LEFT sound channel shrapnel L and/or the RIGHT sound channel shrapnel R, wherein the LEFT sound channel shrapnel L is used for transmitting a LEFT sound channel signal LEFT1, the RIGHT sound channel shrapnel R is used for transmitting a RIGHT sound channel signal RIGHT1, when a matched 3.5mm plug is inserted into the 3.5mm socket J1, the LEFT sound channel shrapnel L and/or the RIGHT sound channel shrapnel R with the fixed shrapnel in contact connection are separated from the corresponding fixed shrapnel, and the LEFT sound channel shrapnel L and the RIGHT sound channel shrapnel R are respectively connected to a first input end in1 and a second input end in2 of the gating unit U2; the USB socket J2 at least includes a pair of differential pins D +, D-, a power pin VBUS and a ground pin GND1, wherein the pair of differential signal pins D +, D-is used for transmitting differential digital signals, the decoding unit U3 is configured to perform digital-to-analog conversion processing on the differential digital signals transmitted by the pair of differential pins D +, D-of the USB socket J2 to obtain an analog LEFT channel signal LEFT2 and an analog RIGHT channel signal RIGHT2, and transmit the analog LEFT channel signal LEFT2 and the analog RIGHT channel signal RIGHT2 to a third input terminal in3 and a fourth input terminal in4 of the gating unit U2, respectively; the control unit U1 is configured to control the gating state of the gating unit U2 according to the connection state of the 3.5mm jack J1 and the USB jack J2 to select one input terminal of the gating unit U2 as a left channel input terminal to be connected to the left channel speaker LE and to select the other input terminal of the gating unit U2 as a right channel input terminal to be connected to the right channel speaker RE.

Wherein, USB socket J2 includes any one in USB A Type socket, micro USB socket, mini USB socket, the Type-C socket at least, and decoding unit U3 can be provided by the coding and decoding chip.

Determining the source of the content played by the speaker according to the connection state of the 3.5mm socket J1 and the USB socket J2, for example, when the 3.5mm socket J1 is plugged into a corresponding plug, no matter whether the USB socket J2 is plugged into a corresponding USB data line to establish connection with the electronic device, the control unit U1 may control the gating state of the gating unit U2, so as to select the input end in1 of the gating unit U2 as the LEFT channel input end to be connected to the LEFT channel speaker LE, and select the input end in2 of the gating unit U2 as the RIGHT channel input end to be connected to the RIGHT channel speaker RE, so that the LEFT channel speaker LE plays the content of the LEFT channel signal LEFT1 transmitted by the LEFT channel dome L, and the RIGHT channel speaker RE plays the content of the RIGHT channel signal RIGHT1 transmitted by the RIGHT channel R; under the condition that the 3.5mm socket J1 is not plugged with a corresponding plug, and the USB socket J2 is plugged with a corresponding USB data line to establish connection with the electronic device, the control unit U1 may both control the gating state of the gating unit U2 to select the input end in3 of the gating unit U2 as the LEFT channel input end to be connected to the LEFT channel speaker LE, and select the input end in4 of the gating unit U2 as the RIGHT channel input end to be connected to the RIGHT channel speaker RE, so that the LEFT channel speaker LE plays the content of the analog LEFT channel signal LEFT2, and the RIGHT channel speaker RE plays the content of the analog RIGHT channel signal RIGHT 2. Thus, the compatibility of the USB interface and the 3.5mm interface on the audio equipment is realized.

In a specific embodiment of the present invention, the audio device further includes a bluetooth chip U4, the bluetooth chip U4 receives a modulated digital signal sent by a connected electronic device, and therefore, the bluetooth chip U4 is configured to demodulate and perform analog-to-digital conversion on the received radio frequency signal to obtain a demodulated LEFT channel signal LEFT3 and a demodulated RIGHT channel signal RIGHT3, and transmit the demodulated LEFT channel signal LEFT3 and the demodulated RIGHT channel signal RIGHT3 to a fifth input terminal in5 and a sixth input terminal in6 of the gating unit U2, respectively, on the basis of which the control unit U1 is configured to control the gating state of the gating unit U2 according to the connection states of the 3.5mm socket J1, the USB socket J2 and the bluetooth chip.

For example, in a case where the 3.5mm socket J1 is plugged into a corresponding plug, regardless of whether the USB socket J2 is plugged into a corresponding USB data line to establish a connection with the electronic device or not, and whether the bluetooth chip U4 is plugged into the electronic device or not, the control unit U1 may control the gating state of the gating unit U2 to select the input terminal in1 of the gating unit U2 as a LEFT channel input terminal to be connected to the LEFT channel speaker LE, and select the input terminal in2 of the gating unit U2 as a RIGHT channel input terminal to be connected to the RIGHT channel speaker RE, so that the LEFT channel speaker LE plays the content of the LEFT channel signal LEFT1 transmitted by the LEFT channel dome L, and the RIGHT channel speaker RE plays the content of the RIGHT channel signal RIGHT1 transmitted by the RIGHT channel R; under the condition that the corresponding plug is not inserted into the 3.5mm socket J1 and the connection between the bluetooth chip U4 and the electronic device is established, no matter whether the socket J2 is inserted into the corresponding USB data line to establish the connection with the electronic device or not, the control unit U1 may control the gating state of the gating unit U2, so as to select the input end in5 of the gating unit U2 as the LEFT channel input end to be connected to the LEFT channel speaker LE and select the input end in6 of the gating unit U2 as the RIGHT channel input end to be connected to the RIGHT channel speaker RE, so that the LEFT channel speaker LE plays and demodulates the content of the LEFT channel signal LEFT3, and the RIGHT channel speaker RE plays and demodulates the content of the RIGHT channel signal RIGHT 3; under the condition that the 3.5mm socket J1 is not inserted with a corresponding plug, the bluetooth chip U4 is not connected with the electronic device, and the USB socket J2 is inserted with a corresponding USB data line and is connected with the electronic device, the control unit U1 may control the gating state of the gating unit U2, so as to select the input terminal in3 of the gating unit U2 as the LEFT channel input terminal to be connected to the LEFT channel speaker LE, and select the input terminal in4 of the gating unit U2 as the RIGHT channel input terminal to be connected to the RIGHT channel speaker RE, so that the LEFT channel speaker LE plays the content of the analog LEFT channel signal LEFT2, and the RIGHT channel speaker RE plays the content of the analog RIGHT channel signal RIGHT 2.

Like this, this audio equipment still possesses the bluetooth function when having realized that USB interface and 3.5mm interface are compatible on audio equipment, and then has improved audio equipment's mobility.

The control unit U1 may be provided by an MCU, the gating unit U2 may be provided by, but not limited to, two one-out-of-four selectors, one selector may select an input terminal as a left channel input terminal, and the other selector may select an input terminal as a right channel input terminal, specifically, the input terminals in1, in3, and in5 may be input terminals of one selector, and the input terminals in2, in4, and in6 may be input terminals of the other selector.

On this basis, in an embodiment of the present invention, the audio device further includes a battery and a charging chip U5, wherein the charging chip U5 is configured to charge the battery according to the power provided by the power pin VBUS of the USB socket J2. Therefore, as long as the USB socket J2 is plugged into the corresponding USB data line to establish connection with the electronic device or the power adapter, the charging chip U5 can charge the battery according to the power provided by the power pin VBUS of the USB socket.

Since the power of the LEFT channel signal LEFT1, the RIGHT channel signal RIGHT1, the analog LEFT channel signal LEFT2, the analog RIGHT channel signal RIGHT2, the demodulated LEFT channel signal LEFT3, and the demodulated RIGHT channel signal RIGHT3 input by the input end of the gating unit U2 are all small and may not be enough to drive the corresponding speakers, in a specific embodiment of the present invention, the audio device further includes a power amplification unit U6, and the power amplification unit U6 is configured to amplify the signal input by the LEFT channel input end and transmit the amplified signal to the LEFT channel speaker, and amplify the signal input by the RIGHT channel input end and transmit the amplified signal to the RIGHT channel speaker.

Therefore, in an embodiment of the present invention, the audio device further includes a first filtering unit U7 and a second filtering unit U8, where the first filtering unit U7 is configured to filter the LEFT channel signal LEFT1 input by the LEFT channel dome L and transmit the filtered LEFT channel signal LEFT1 to the first input end in1; the second filtering unit U8 is configured to filter the signal input by the right channel dome R and transmit the filtered signal to the second input terminal in2.

Further, the first filtering unit U7 includes a first inductor L1 and a first capacitor C1 connected in series between the left channel clip L and the first input terminal in1, and a first resistor R1 and a second capacitor C2 connected in parallel between a potential point between the first inductor L1 and the first capacitor C1 and the ground terminal GND.

In order to make the filtering effects of the first filtering unit U7 and the second filtering unit U8 the same, the circuit structures of the first filtering unit U7 and the second filtering unit U8 may be the same, and the second filtering unit U8 includes a second inductor L2 and a third capacitor C3 connected in series between the right channel spring R and the second input terminal in2, and a second resistor R2 and a fourth capacitor C4 connected in parallel between a potential point between the second inductor L2 and the third capacitor C3 and the ground terminal GND.

The capacitor C1 and the capacitor C3 are mainly used for blocking direct current, the capacitor C2 and the resistor R1, and the capacitor R4 and the resistor R2 form a low-pass filter circuit, and the first inductor L1 and the second inductor L2 are magnetic beads and can be used for filtering noise signals with specific frequency, such as 100-200 MHz.

On this basis, when the right channel shrapnel R has the fixed shrapnel F corresponding to the contact connection, the control unit U1 may detect the connection state of the 3.5mm socket J1 by detecting whether the right channel shrapnel R is connected with the fixed shrapnel F, specifically, if the right channel shrapnel R is connected with the fixed shrapnel F, it indicates that the 3.5mm socket J1 is not inserted with the corresponding plug, and if the right channel shrapnel R is not connected with the fixed shrapnel F, it indicates that the 3.5mm socket J1 is inserted with the corresponding plug. The detection circuit U9 may be as shown in fig. 2, and includes a single-pole double-throw switch, such as a PNP type triode or a P-channel MOS transistor, or an NPN type triode or an N-channel MOS transistor, in this embodiment, the PNP type triode Q1 is used, a base of the triode Q1 is connected to a power supply terminal VDD through a resistor R4 and a resistor R6, the power supply terminal VDD may be, for example, a discharge voltage output terminal of a battery or a power supply voltage input terminal of the control unit U1, the base of the triode Q1 is further connected to a fixed elastic piece F through a resistor R4 and a resistor R3 connected in series, a capacitor C5 is further connected between a potential point between the resistor R3 and the resistor R4 and a ground terminal GND, wherein a resistance value of the resistor R3 is much smaller than a resistance value of the resistor R6, so that when the right channel elastic piece R is connected in contact with the fixed elastic piece F, the resistor R3 and the potential point of the resistor R6 support output a low level; an emitting electrode of the triode Q1 is connected to a power supply end VDD, a collecting electrode is grounded through a resistor R5, and the collecting electrode outputs a connection signal S1 of a 3.5mm socket J1, so that when a corresponding plug is not inserted into the 3.5mm socket J1, the right sound channel elastic sheet R is in contact connection with the fixed elastic sheet F, and the right sound channel elastic sheet R is grounded through a resistor R2, therefore, a base electrode of the triode Q1 is in a low level, the triode Q1 is conducted, and the connection signal S1 is in a high level; when the 3.5mm socket J1 is plugged with a corresponding plug, the right channel elastic sheet R is disconnected from the fixed elastic sheet F, so that the base of the triode Q1 is at a high level, the triode Q1 is cut off, and the connection signal S1 is at a low level, so that the connection signal S1 is input to the control unit U1 through the GPIO interface, and the control unit U1 can obtain the connection state of the 3.5mm socket J1 according to the level of the connection signal S1, specifically, when the connection signal S1 is detected to be at the high level, it indicates that the 3.5mm socket J1 is not plugged with the corresponding plug; when the connection signal S1 is detected to be low, it indicates that the 3.5mm socket J1 is plugged in the corresponding plug.

Because the D + and/or D-pin of the USB interface of the electronic device is connected to the power pin through the pull-up resistor, when the decoding unit U3 detects a high level on the D + and/or D-pin of the USB socket J2, it may be considered that the USB socket J2 is connected to the electronic device through the corresponding USB data line, otherwise, it may be considered that the USB socket J2 is not connected to the electronic device, the decoding unit U3 may send the detection result to the control unit U1 through the I2C interface, for example, and the control unit U1 determines the connection state of the USB socket J2 according to the received detection result.

The bluetooth chip U4 may also be set to send a result of whether the bluetooth connection with the electronic device is established to the control unit U1, for example, the connection result may be sent through a UART interface, an I2C interface, an SPI interface, or a GPIO interface, and the control unit U1 determines the connection state of the bluetooth chip U4 according to the received result.

The audio device may be, for example, a headphone, a sound box, or the like. The audio equipment realizes the compatibility among various audio inputs, greatly increases the use occasions of the audio equipment and improves the applicability of the audio equipment.

The above embodiments mainly focus on differences from other embodiments, but it should be clear to those skilled in the art that the above embodiments can be used alone or in combination with each other as needed.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. The audio equipment is characterized by comprising a left sound channel Loudspeaker (LE), a right sound channel loudspeaker (RE), a 3.5mm socket (J1), a USB socket (J2), a decoding unit (U3), a control unit (U1) and a gating unit (U2), wherein the 3.5mm socket (J1) is provided with a left sound channel elastic sheet (L) and a right sound channel elastic sheet (R), and the left sound channel elastic sheet (L) and the right sound channel elastic sheet (R) are respectively connected to a first input end (in 1) and a second input end (in 2) of the gating unit (U2); the decoding unit (U3) is configured to perform digital-to-analog conversion processing on the differential digital signal transmitted by the USB socket (J2) to obtain an analog LEFT channel signal (LEFT 2) and an analog RIGHT channel signal (RIGHT 2), and transmit the analog LEFT channel signal (LEFT 2) and the analog RIGHT channel signal (RIGHT 2) to a third input terminal (in 3) and a fourth input terminal (in 4) of the gating unit (U2), respectively; the control unit (U1) is arranged to control the gating state of the gating unit (U2) in dependence on the connection state of the 3.5mm socket (J1) and the USB socket (J2) to select the first input (in 1) of the gating unit (U2) as a left channel input to be connected to the left channel Loudspeaker (LE) and the second input (in 2) of the gating unit (U2) as a right channel input to be connected to the right channel loudspeaker (RE), or to select the third input (in 3) of the gating unit (U2) as a left channel input to be connected to the left channel Loudspeaker (LE) and the fourth input (in 4) of the gating unit (U2) as a right channel input to be connected to the right channel loudspeaker (RE),

the audio equipment further comprises a first filtering unit (U7) and a second filtering unit (U8), wherein the first filtering unit (U7) is used for filtering a signal input by the left channel shrapnel (L) and then transmitting the signal to the first input end (in 1); the second filtering unit (U8) is configured to filter the signal input by the right channel shrapnel (R) and transmit the filtered signal to the second input end (in 2),

the first filtering unit (U7) comprises a first inductor (L1) and a first capacitor (C1) which are connected in series between the left channel elastic sheet (L) and the first input end (in 1), and a first resistor (R1) and a second capacitor (R2) which are connected in parallel between a potential point between the first inductor (L1) and the first capacitor (C1) and a ground end (GND),

the second filtering unit (U8) comprises a second inductor (L2) and a third capacitor (C3) which are connected between the right channel elastic sheet (R) and the second input end (in 2) in series, and a second resistor (R2) and a fourth capacitor (C4) which are connected between a potential point between the second inductor (L2) and the third capacitor (C3) and a ground end (GND) in parallel.

2. The audio device according to claim 1, characterized in that the audio device further comprises a bluetooth chip (U4), the bluetooth chip (U4) being arranged to demodulate and analog-to-digital convert the received radio frequency signal, obtain a demodulated LEFT channel signal (LEFT 3) and a demodulated RIGHT channel signal (RIGHT 3), and to transfer the demodulated LEFT channel signal (LEFT 3) and the demodulated RIGHT channel signal (RIGHT 3) to a fifth input (in 5) and a sixth input (in 6) of the gating unit (U2), respectively, the control unit (U1) being further arranged to control the gating state of the gating unit (U2) depending on the connection state of the bluetooth chip (U4).

3. Audio device according to claim 1, characterized in that the audio device further comprises a battery (battery) and a charging chip (U5), the charging chip (U5) being arranged to charge the battery (battery) according to a power supply provided by a power supply pin (VBUS) of the USB socket (J2).

4. Audio device according to claim 1, characterized in that the audio device further comprises a power amplifier unit (U6), wherein the power amplifier unit (U6) is configured to amplify the signal inputted from the left channel input terminal and transmit the amplified signal to the left channel speaker (LE), and to amplify the signal inputted from the right channel input terminal and transmit the amplified signal to the right channel speaker (RE).

5. The audio device according to claim 1, wherein the USB socket (J2) comprises at least any one of a USB Type a socket, a micro USB socket, a mini USB socket, a Type-C socket.

6. Audio device according to claim 1, characterized in that the control unit (U1) is provided by an MCU.

7. Audio device according to claim 1, characterized in that the gating unit (U2) is provided by two one-out-of-four selectors.