CN116866760A

CN116866760A - Sound extension playing system

Info

Publication number: CN116866760A
Application number: CN202210311087.9A
Authority: CN
Inventors: 陈冠宏
Original assignee: C & M Audio Co ltd
Current assignee: C & M Audio Co ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2023-10-10

Abstract

The invention provides a sound extension playing system, which comprises an outer shell, at least one Bluetooth earphone and a control circuit. Because of special signal contact and circuit design, after any audio playing equipment is installed with the system, the Bluetooth earphone meeting the requirements of the system can be charged and Bluetooth connection can be converted. Compared with the traditional Bluetooth earphone which needs to carry out more complex operations of Bluetooth disconnection and reconnection, the Bluetooth earphone can easily switch sound source hardware. In addition, be equipped with independent sound regulation interface on the bluetooth headset for it is more convenient in operation.

Description

Sound extension playing system

Technical Field

The present invention relates to a sound extension playing system, and more particularly, to a sound extension playing system capable of being embedded in an existing audio playing device to serve as a second audio playing pipeline.

Background

The bluetooth specification is the most widely used industry standard for short-range point-to-point wireless signal transmission. The devices conforming to the Bluetooth specification can be connected with each other by signals so as to execute specific tasks. For example, the bluetooth headset can be connected with a computer with a bluetooth communication module in a wireless way, and the computer can provide audio signals to be played by the bluetooth headset. The bluetooth devices need to be paired before the connection operation starts, typically by the master bluetooth device detecting the slave bluetooth devices available around the connection, at least one of which is selected. When the slave bluetooth device is turned on after being turned off, for example, after charging is completed, and the slave bluetooth device is required to be connected again, whether the master bluetooth device is still in a connectable state (turned on and performing connection searching) can be finally determined whether pairing and connection can be completed. Such a situation often results in a disconnection that is not known to the user, and even erroneously connects to other unrelated bluetooth devices, which can be annoying to the user in using the bluetooth device.

A bluetooth headset is further described as an example. In addition to the problem of power-on connection, the most common problem with bluetooth headsets is insufficient power, and the bluetooth headsets need to be charged in time to cope with the use requirement. However, bluetooth headsets generally have corresponding charging devices, but these charging devices are not necessarily carried by users, and are troublesome when charging is required. If the Bluetooth headset can be charged from a corresponding master Bluetooth device, such as a notebook computer, it is very convenient for the user of the Bluetooth headset. In addition, the conventional bluetooth headset is not designed with a remote sound control mechanism, and often needs to be operated and adjusted by the main bluetooth device when the volume is required to be adjusted or the equalizer function is performed, which is another inconvenience.

In order to solve the above-mentioned trouble faced by bluetooth earphone, there is a proposal of the sound extension playing system of the present invention.

Disclosure of Invention

This paragraph of text extracts and compiles certain features of the invention. Other features will be disclosed in subsequent paragraphs. It is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims.

In order to solve the foregoing problems, the present invention discloses a sound extension playing system installed in a receiving space of an audio playing device. The sound extension playing system comprises: at least one Bluetooth earphone which is arranged in the accommodating space in a removable way and comprises a first Bluetooth module, a pair of first signal contacts and a first charging interface; and a control circuit, which is arranged in the accommodating space, is connected with a main control unit and a second Bluetooth module signal of the audio playing equipment, and is electrically connected with a power module of the audio playing equipment to execute the following operations: is connected with the pair of first signal contacts and is electrified to form an electric loop; when the electric loop is formed, charging the at least one Bluetooth headset through the first charging interface; when the electric loop disappears, stopping charging the at least one Bluetooth headset and controlling the second Bluetooth module to actively connect with the first Bluetooth module in a signal manner; and when the second Bluetooth module is in signal connection with the first Bluetooth module, the main control unit is controlled to transmit an audio signal to the at least one Bluetooth headset for playing.

Preferably, if the second bluetooth module is in signal connection with the first bluetooth module when the electrical loop is formed, the control circuit controls the main control unit to interrupt signal connection.

According to the present invention, the control circuit may further include: a power management module electrically connected to the power module for providing the power required by the operation of the electrical connection element; the Bluetooth headset charging module is electrically connected with the power management module and can be electrically connected with the first charging interface to charge the at least one Bluetooth headset; the second signal contact is electrically connected with the power management module, and when the second signal contact is electrically connected with the first signal contact, the electric loop is formed by the power from the power management module; an internal communication interface connected with the main control unit and the second Bluetooth module in a signal manner; and a second control module electrically connected with the power management module and connected with the Bluetooth headset charging module, the pair of second signal contacts and the internal communication interface signal, detecting whether the electric loop is formed or not, controlling the Bluetooth headset charging module to charge the at least one Bluetooth headset through the first charging interface when the electric loop is formed, controlling the Bluetooth headset charging module to stop charging the at least one Bluetooth headset when the electric loop is eliminated, controlling the second Bluetooth headset to actively connect with the first Bluetooth module through the internal communication interface, controlling the master control unit to play the audio through the at least one Bluetooth headset through the internal communication interface when the second Bluetooth headset is connected with the first Bluetooth module signal, and controlling the master control unit to interrupt signal connection through the internal communication interface when the electric loop is formed and the second Bluetooth headset is connected with the first Bluetooth module signal. The internal communication interface can be an RS-232 standard interface, an RS-422 standard interface, an RS-423 standard interface, an RS-485 standard interface or an I-C standard interface.

In an embodiment, the bluetooth headset charging module is a wireless charging module.

In another embodiment, the bluetooth headset charging module may further include: the second charging interface can be connected with the first charging interface to perform charging operation; and a charging control unit electrically connected with the power management module, selectively electrically connected with the second charging interface and in signal connection with the second control module, and controlled by the second control module to selectively transmit power from the power management module to the second charging interface.

Preferably, the second charging interface is two metal contacts.

According to the present invention, the bluetooth headset further comprises: the power receiving module can be electrically connected with the first charging interface to receive power from the first charging interface; the power supply module is electrically connected with the power receiving module to receive and temporarily store the power from the power receiving module and provide the required power for the operation of the electric connection elements outside the power receiving module; an audio playing module electrically connected to the power supply module for playing the audio; a first control module electrically connected with the power supply module and connected with the first Bluetooth module, the audio playing module and the pair of first signal contacts for controlling the first Bluetooth module to receive the audio and transmit the audio to the audio playing module for playing, and detecting whether the electric loop is formed by the pair of first signal contacts; an antenna module; the radio frequency module is electrically connected with the power supply module and the antenna module, is in signal connection with the first Bluetooth module and the first control module, and receives the audio signal from the main control unit through the antenna module and transmits the audio signal to the first Bluetooth module; and a earphone shell partially covering and protecting the pair of first signal contacts, the first charging interface, the first Bluetooth module, the power receiving module, the power supplying module, the audio playing module, the first control module, the antenna module and the radio frequency module. The first Bluetooth module is electrically connected with the power supply module, and the pair of first signal contacts and the first charging interface part expose the earphone shell.

The power supply module may further include: a secondary battery unit for receiving and temporarily storing the power from the power receiving module; and a battery management unit electrically connected with the secondary battery unit for providing the electric power required by the operation of the electric connection elements outside the power receiving module.

The Bluetooth headset can further comprise a sound adjusting interface which is electrically connected with the power receiving module and is connected with the first control module in a signal way, the Bluetooth headset is arranged on the headset shell and is operated to send a control signal to the first control module, and the first control module controls the audio playing module to adjust the volume and the audio frequency when the audio playing module plays the audio according to the control signal and perform equalization processing. The sound adjustment interface may include at least one of the following elements: a touch pad, a touch panel, a key or a knob.

According to the invention, the audio playing device can be a personal computer, a notebook computer, a vehicular audio-video playing module, a television, a screen with playing function, a smart phone, a tablet personal computer, a bar sound box or a loudspeaker.

Because of special signal contact and circuit design, any audio playing equipment is provided with the system, and the Bluetooth headset meeting the requirements of the system can be charged and Bluetooth connection can be converted. Compared with the traditional Bluetooth earphone which needs to carry out more complex operations of Bluetooth disconnection and reconnection, the Bluetooth earphone can easily switch sound source hardware, and can be used for listening to music when the user walks to the place. In addition, be equipped with independent sound regulation interface on the bluetooth headset for it is more convenient in operation.

Drawings

Fig. 1 is an external view of an audio extension playing system according to an embodiment of the invention;

FIG. 2 is a schematic diagram of the audio extension playback system installed in a notebook computer;

FIG. 3 is a circuit block diagram of a control circuit according to an embodiment of the present invention;

fig. 4 is a circuit block diagram of a bluetooth headset according to an embodiment of the invention.

Description of the reference numerals

1. Sound extension playing system

2. Notebook computer

21. Main control unit

22. Second Bluetooth module

23. Power module

10. Outer casing

11. Control circuit space

12. Bluetooth earphone installation space

20. Bluetooth earphone

201. First Bluetooth module

202. First signal contact

203. First charging interface

204. Power receiving module

205. Power supply module

2051. Secondary battery cell

2052. Battery management unit

206. Audio playing module

207. First control module

208. Antenna module

209. Radio frequency module

210. Earphone shell

211. Sound adjusting interface

211a key

30. Control circuit

301. Power management module

302. Bluetooth headset module that charges

3021. Second charging interface

3022. Charging control unit

303. Second signal contact

304. Internal communication interface

305. And a second control module.

Detailed Description

The present invention will be described more specifically by referring to the following embodiments.

Please refer to fig. 1, which is a schematic diagram illustrating an external appearance of an audio extension playback system 1 according to an embodiment of the present invention. The audio extension playing system 1 can be installed in the accommodating space of the audio playing device with various existing audio playing functions as a second audio playing pipeline of the audio playing device. That is, the audio playback apparatus must have enough space to accommodate before the system is installed. The audio playing device may include, but is not limited to, a personal computer, a notebook computer, a vehicular audio/video playing module, a television, a screen with playing function, a smart phone, a tablet computer, a sound bar and a speaker. In the present embodiment, please refer to fig. 2 (which is a schematic diagram of the audio extension playing system 1 installed in a notebook computer), which illustrates a notebook computer 2 as the audio playing device. The audio of the notebook computer 2 is played by a pair of speakers, and the Bluetooth headset can be used for creating a playing pipeline because the audio extension playing system 1 is installed. In the present embodiment, the audio extension playing system 1 includes an outer housing 10, at least one bluetooth headset 20 and a control circuit 30, which are described in detail below.

The outer casing 10 is installed in a receiving space of an audio playing device (notebook computer 2) to form a control circuit space 11 and a bluetooth headset installation space 12. The bluetooth headset installation space 12 is a space for installing when the bluetooth headset is to be charged, and the control circuit space 11 is a space for accommodating related circuits. In fig. 1, the control circuit space 11 is shown with a dotted line (because it cannot be seen from the outside), and the control circuit space 11 and the bluetooth headset mounting space 12 are respectively located at the inner and outer sides of the outer case 10. In addition, as shown in fig. 2, the bluetooth headset installation space 12 can be communicated with the external environment of the audio playing device, so that people can take the device at hand when the device needs to be used. However, in other embodiments, the bluetooth headset housing space 12 may also be separated from the external environment of the audio playback device by a partition, such as a cover of a housing, for protecting the bluetooth headset 20, and the bluetooth headset 20 may be accessed by removing or disposing of the partition when necessary. In practice, the outer housing 10 may be unnecessary, so long as there is enough supporting structure in the accommodating space of the audio playing device, so as to stabilize and protect the at least one bluetooth headset 20 and the control circuit 30.

The number of bluetooth headset 20 is at least one according to the present invention, so that one single-ear-to-ear bluetooth headset is applied in this patent. In the present embodiment, the number of bluetooth headsets 20 is two, and is a pair of true bluetooth headsets having left and right channels. The two bluetooth headsets 20 are removably installed in the bluetooth headset installation space 12 (or in the accommodation space of the audio playback apparatus without the outer case 10). Each bluetooth headset has the same hardware equipment except that it is responsible for different sound channels, and includes a first bluetooth module 201, an external pair of first signal contacts 202, a first charging interface 203, a power receiving module 204, a power supplying module 205, an audio playing module 206, a first control module 207, an antenna module 208, a radio frequency module 209, a headset housing 210 and a sound adjusting interface 211.

Please refer to fig. 4, which is a circuit block diagram of the bluetooth headset 20 (including the headset housing 210) according to an embodiment of the present invention. The first bluetooth module 201 is a device for wireless transmission in the bluetooth headset 20, and may be a chip. The first bluetooth module 201 is electrically connected to the power supply module 205 (in fig. 3 and 4, the former is indicated by a thick solid line connection and the latter is indicated by a broken line connection in order to distinguish between the electrical connection and the signal connection). The two first signal contacts 202 are used to form an electrical circuit with a pair of second signal contacts of the control circuit 30, so as to perform charging or connection judgment for the bluetooth headset 20. In accordance with the present invention, the first signal contact 202 is a two metal contact, preferably a copper contact, in any form as long as good electrical conduction characteristics are maintained. The pair of first signal contacts 202 partially expose the earphone housing 210, as shown in fig. 1. The first charging interface 203 may be configured to be charged by a wired method or may be configured to be charged by a wireless method. The former may be a specific charging interface, such as USB-C, or simply two charging terminals; the latter may use a wireless charging architecture such as the QI specification, in this embodiment two metal contacts. Like the first signal contact 202, the first charging interface 203 is partially exposed from the earphone housing 210, so as to facilitate electrical connection with the charging terminal.

The power receiving module 204 may be electrically connected to the first charging interface 203 to receive power from the first charging interface. In addition, the power receiving module 204 has a function of adjusting the voltage of the input power and preventing the surge from damaging the whole circuit. The power supply module 205 is electrically connected to the power receiving module 204 to receive and temporarily store the power from the power receiving module 204 and provide the power required for the operation of the electrical connection elements outside the power receiving module 204. Further, the power supply module 205 includes a secondary battery unit 2051 and a battery management unit 2052. The secondary battery unit 2051 is configured to receive and temporarily store the power from the power receiving module 204, and the battery management unit 2052 is electrically connected to the secondary battery unit 2051 to provide the power required for the operation of the electrical connection elements other than the power receiving module 204.

The audio playing module 206 is electrically connected to the power supply module 205, and plays audio received by the first bluetooth module 201 from the notebook computer 2. In practice, the audio playback module 206 is a single earphone. The first control module 207 is electrically connected to the power supply module 205, and is in signal connection with the first bluetooth module 201, the audio playing module 206 and the pair of first signal contacts 202, which may be a controller of an integrated circuit. The first control module 207 controls the first bluetooth module 201 to receive the audio signal and transmit the audio signal to the audio playing module 206 for playing, and detects whether the electrical circuit is formed through the pair of first signal contacts 202.

The rf module 209 is electrically connected to the power supply module 205 and the antenna module 208, and is in signal connection with the first bluetooth module 201 and the first control module 207, and can receive the audio signal from the main control unit 21 through the antenna module 208 and transmit the audio signal to the first bluetooth module 201.

The earphone housing 210 partially encloses and protects the pair of first signal contacts 202, the first charging interface 203, the first bluetooth module 201, the power receiving module 204, the power supplying module 205, the audio playing module 206, the first control module 207, the antenna module 208, and the rf module 209. The earphone housing 210 in fig. 1 is drawn only schematically. In fact, the shape of the bluetooth headset 20 according to the present invention can be variously designed, and is not limited to that shown in fig. 1.

The voice adjusting interface 211 is electrically connected to the power receiving module 205 and is in signal connection with the first control module 207. The sound adjusting interface 211 is mounted on the earphone housing 210, and receives a user operation to send a control signal to the first control module 207, and the first control module 207 controls the audio playing module 206 to adjust the volume and audio frequency during the audio playing according to the control signal, and performs an equalization process. In accordance with the present invention, the sound adjustment interface 211 may include at least one of the following elements: a touch pad, a touch panel, a key or a knob. Please refer to fig. 1. In this embodiment, the voice adjustment interface 211 is a module, and includes six buttons 211a: sound effects such as play, volume up, volume down, audio up (treble), audio down (bass), and cyclic adjustment. Unlike the conventional bluetooth headset, the bluetooth headset 20 of the present invention has independent sound volume, audio and equalizer sound processing control keys, which can be manipulated independently of the host computer (notebook computer 2). When one of the above-mentioned keys 211a is pressed, a corresponding control signal is sent to the first control module 207.

The control circuit 30 is disposed in the control circuit space 11 (shown in fig. 1 by dotted lines, because it cannot be seen from the outside) or in the accommodating space of the notebook computer 2 without the outer case 10. Referring to fig. 2, the control circuit 30 is in signal connection with a main control unit 21 (shown in dotted line, because it cannot be seen from the exterior) and a second bluetooth module 22 (shown in dotted line, because it cannot be seen from the exterior) of the audio playback apparatus (notebook computer 2), and is electrically connected with a power module 23 (shown in dotted line, because it cannot be seen from the exterior) of the notebook computer 2. The control circuit 30 performs the following operations: is connected to the pair of first signal contacts 202 and is energized to form the aforementioned electrical circuit; when the electric loop is formed, the two bluetooth headsets 20 are charged through the first charging interface 203; when the circuit is lost (the connection with the pair of first signal contacts 202 is interrupted), the two bluetooth headsets 20 are stopped to be charged and the second bluetooth module 22 is controlled to be actively connected with the first bluetooth module 201 in a signal manner; when the second bluetooth module 22 is in signal connection with the first bluetooth module 201, the control main control unit 21 transmits an audio signal to the two bluetooth headphones 20 for playing. Preferably, if the second bluetooth module 22 is in signal connection with the first bluetooth module 201 when the electrical circuit is formed, the control circuit 30 controls the main control unit 21 to interrupt the signal connection.

In operation, when the second bluetooth module 22 is in signal connection with the first bluetooth module 201, the bluetooth headset 20 can hear the audio signal from the notebook computer 2. If the bluetooth headset 20 is to be charged, the bluetooth headset 20 is placed in the bluetooth headset mounting space 12 (or a predetermined position in the receiving space of the notebook computer 2 without the housing 10), and the control circuit 30 is electrically connected to form an electrical loop by using the pair of first signal contacts 202, and the control circuit 30 also cancels the bluetooth connection between the bluetooth headset 20 and the notebook computer 2 in addition to charging the two bluetooth headsets 20. When the bluetooth headset 20 is charged, the electrical loop is removed from the bluetooth headset mounting space 12 (or the predetermined position in the accommodating space of the notebook computer 2) and disappears due to the separation of the pair of first signal contacts 202 from the control circuit 30, and the control circuit 30 remembers that the notebook computer 2 and the bluetooth headset 20 are in bluetooth connection, so that the user can continue listening to the audio. If the same control circuit 30 is also installed on another car audio-visual playing module (not shown), when two bluetooth headsets 20 connected with the notebook computer 2 are moved to the car audio-visual playing module for charging or are temporarily formed into a circuit with the control circuit 30 of the car audio-visual playing module and then separated, the control circuit 30 of the car audio-visual playing module will connect the two bluetooth headsets 20 to the car audio-visual playing module. By way of illustration of this example of operation, a bluetooth headset that meets the requirements of the audio playback system 1 can be charged and a bluetooth connection switched on as long as any audio playback device is equipped with the audio playback system 1. Compared with the traditional Bluetooth earphone which needs to carry out more complex Bluetooth disconnection and reconnection operation, the Bluetooth earphone of the invention can easily and manually switch the audio hardware without switching, and is a breakthrough in practical use.

In order to accomplish the above, the control circuit 30 includes a power management module 301, a bluetooth headset charging module 302, a pair of second signal contacts 303, an internal communication interface 304 and a second control module 305. The power management module 301 is electrically connected to the power module 23 to provide the necessary power for the operation of the electrical connection elements. The bluetooth headset charging module 302 is electrically connected to the power management module 301, and can be electrically connected to the first charging interface 203 to charge the two bluetooth headsets 20. The bluetooth headset charging module 302 further includes a second charging interface 3021 and a charging control unit 3022. The second charging interface 3021 may be connected to the first charging interface 203 for performing a charging operation. In this embodiment, since the first charging interface 203 is two metal contacts, the second charging interface 3021 is also two metal contacts. The charging control unit 3022 is electrically connected to the power management module 301, selectively electrically connected to the second charging interface 3021, and signal-connected to the second control module 305. The charging control unit 3022 may be controlled by the second control module 305 to selectively transfer power from the power management module 301 to the second charging interface 3021. In practice, the power management module 301 may be a switch. In other embodiments, the Bluetooth headset charging module 302 may be a wireless charging module.

The two second signal contacts 303 are electrically connected to the power management module 301. When the pair of second signal contacts 303 are electrically connected to the pair of first signal contacts 202, the power from the power management module 301 is formed into the aforementioned electrical circuit.

The internal communication interface 304 is in signal connection with the main control unit 21 and the second bluetooth module 22. The internal communication interface 304 is to conform to the internal communication specification of the existing electronic device, so that when the control circuit 30 is embedded in the audio playing device such as the notebook computer 2, it can communicate with other components of the notebook computer 2. In accordance with the present invention, internal communication interface 304 may be an RS-232 specification interface, an RS-422 specification interface, an RS-423 specification interface, an RS-485 specification interface, or an I.C specification interface.

The second control module 305 is electrically connected to the power management module 301, and is in signal connection with the bluetooth headset charging module 302, the pair of second signal contacts 303, and the internal communication interface 304. The second control module 305 may be a controller, and has the functions of detecting whether the electric loop is formed, controlling the bluetooth headset charging module 302 to charge the two bluetooth headsets 20 through the first charging interface 203 when the electric loop is formed, controlling the bluetooth headset charging module 302 to stop charging the two bluetooth headsets 20 and controlling the second bluetooth module 22 to actively connect with the first bluetooth module 201 through the internal communication interface 304 when the electric loop is disappeared, controlling the master control unit 21 to play the audio signal through the two bluetooth headsets 20 through the internal communication interface 304 when the second bluetooth module 22 is connected with the first bluetooth module 201 through the internal communication interface 304, and controlling the master control unit 21 to interrupt signal connection through the internal communication interface 304 when the electric loop is formed and the second bluetooth module 22 is connected with the first bluetooth module 201 through the signal connection.

Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, but rather is capable of modification and variation without departing from the spirit and scope of the present invention.

Claims

1. A sound extension playing system installed in a receiving space of an audio playing device, comprising:

at least one Bluetooth earphone which is arranged in the accommodating space in a removable way and comprises a first Bluetooth module, a pair of first signal contacts and a first charging interface; and

The control circuit is arranged in the accommodating space, is in signal connection with a main control unit and a second Bluetooth module of the audio playing equipment, and is electrically connected with a power module of the audio playing equipment to execute the following operations:

is connected with the pair of first signal contacts and is electrified to form an electric loop;

when the electric loop is formed, charging the at least one Bluetooth headset through the first charging interface;

when the electric loop disappears, stopping charging the at least one Bluetooth headset and controlling the second Bluetooth module to actively connect with the first Bluetooth module in a signal manner; and

When the second Bluetooth module is in signal connection with the first Bluetooth module, the main control unit is controlled to transmit an audio signal to the at least one Bluetooth headset for playing.

2. The system of claim 1, wherein the control circuit controls the master control unit to interrupt the signal connection if the second bluetooth module is in signal connection with the first bluetooth module when the electrical loop is formed.

3. The sound extension play system of claim 1, wherein the control circuit further comprises:

a power management module electrically connected to the power module for providing the power required by the operation of the electrical connection element;

the Bluetooth headset charging module is electrically connected with the power management module and can be electrically connected with the first charging interface to charge the at least one Bluetooth headset;

a pair of second signal contacts electrically connected to the power management module, the pair of second signal contacts electrically connected to the pair of first signal contacts forming the electrical loop with power from the power management module;

an internal communication interface connected with the main control unit and the second Bluetooth module in a signal manner; and

The second control module is electrically connected with the electric power management module and is in signal connection with the Bluetooth headset charging module, the pair of second signal contacts and the internal communication interface, whether the electric loop is formed or not is detected, when the electric loop is formed, the Bluetooth headset charging module is controlled to charge the at least one Bluetooth headset through the first charging interface, when the electric loop is eliminated, the Bluetooth headset charging module is controlled to stop charging the at least one Bluetooth headset and is controlled to actively be in signal connection with the first Bluetooth module through the internal communication interface, when the second Bluetooth module is in signal connection with the first Bluetooth module, the master control unit is controlled to play the audio through the at least one Bluetooth headset through the internal communication interface, and when the electric loop is formed and the second Bluetooth module is in signal connection with the first Bluetooth module, the master control unit is controlled to interrupt signal connection through the internal communication interface.

4. The audio extension playback system of claim 3, wherein the internal communication interface is an RS-232 specification interface, an RS-422 specification interface, an RS-423 specification interface, an RS-485 specification interface, or an icy specification interface.

5. The audio extension playback system of claim 3, wherein the bluetooth headset charging module is a wireless charging module.

6. The sound extension play system of claim 3, wherein the bluetooth headset charging module further comprises:

the second charging interface can be connected with the first charging interface to perform charging operation; and

And the charging control unit is electrically connected with the power management module, is selectively electrically connected with the second charging interface and is in signal connection with the second control module, and is controlled by the second control module to selectively transmit the power from the power management module to the second charging interface.

7. The audio extension playback system of claim 6, wherein the second charging interface is two metal contacts.

8. The sound extension play system of claim 1, wherein the bluetooth headset further comprises:

the power receiving module can be electrically connected with the first charging interface to receive power from the first charging interface;

the power supply module is electrically connected with the power receiving module to receive and temporarily store the power from the power receiving module and provide the required power for the operation of the electric connection elements outside the power receiving module;

an audio playing module electrically connected to the power supply module for playing the audio;

a first control module electrically connected with the power supply module and connected with the first Bluetooth module, the audio playing module and the pair of first signal contacts for controlling the first Bluetooth module to receive the audio and transmit the audio to the audio playing module for playing, and detecting whether the electric loop is formed by the pair of first signal contacts;

an antenna module;

the radio frequency module is electrically connected with the power supply module and the antenna module, is in signal connection with the first Bluetooth module and the first control module, and receives the audio signal from the main control unit through the antenna module and transmits the audio signal to the first Bluetooth module; and

An earphone shell partially covering and protecting the pair of first signal contacts, the first charging interface, the first Bluetooth module, the power receiving module, the power supplying module, the audio playing module, the first control module, the antenna module and the RF module,

the first Bluetooth module is electrically connected with the power supply module, and the pair of first signal contacts and the first charging interface part expose the earphone shell.

9. The sound extension playback system of claim 8, wherein the power supply module further comprises:

a secondary battery unit for receiving and temporarily storing the power from the power receiving module; and

And the battery management unit is electrically connected with the secondary battery unit and provides required power for the operation of the electric connection elements outside the power receiving module.

10. The system of claim 8, wherein the bluetooth headset further comprises a sound adjusting interface electrically connected to the power receiving module and signal-connected to the first control module, and mounted on the headset housing, for receiving an operation to send a control signal to the first control module, and the first control module controls the audio playing module to adjust the volume and audio frequency of the audio signal during playing and perform equalization processing according to the control signal.

11. The sound extension play system of claim 10, wherein the sound adjustment interface comprises at least one of the following elements: a touch pad, a touch panel, a key or a knob.

12. The audio playback system of claim 1, wherein the audio playback device is a personal computer, a notebook computer, a vehicular audio playback module, a television, a screen with playback function, a smart phone, a tablet computer, a sound bar, or a speaker.