CN101114846A - Bluetooth wireless multimedia transmission device and system and method thereof - Google Patents

Abstract

A kind of bluetooth wireless multimedia transmission device, it adopts Advanced Audio Distribution Profile (A2 DP) to carry on the Audio data transmission, this bluetooth wireless multimedia transmission device includes: a Bluetooth wireless transmission module having a Bluetooth transmitter mode and a Bluetooth receiver mode, transmitting audio data to the outside when it is set to the Bluetooth transmitter mode, and receiving the audio data from the outside when it is set to the Bluetooth receiver mode, and a mode switch for selectively switching the Bluetooth wireless multimedia transmission device to the Bluetooth transmitter mode or the Bluetooth receiver mode; the invention can enable the multimedia playing device to have the function of carrying out Bluetooth wireless transmission by adopting an A2DP protocol, overcomes the defect that the Bluetooth wireless multimedia playing device only has one-way transmission in the prior art, and further improves the use convenience of wireless transmission.

Description

Bluetooth wireless multimedia transmission device and system and method thereof

technical field

The invention relates to a wireless transmission technology, in particular to a Bluetooth (Bluetooth) wireless multimedia transmission technology.

Background technique

With the development of wireless technology, wireless Bluetooth technology has gradually been favored by consumers in recent years, and wireless Bluetooth technology is currently mainly used in the transmission of voice and data on mobile phones and computers. In addition, in wireless Bluetooth transmission technology, in order to support The music playback of the left and right channels defines the stereo specification (Profile), that is, the Advanced Audio Distribution Profile (A2DP), which is different from the HandsFree Profile, which is widely used in mobile phones. HFP), can provide wireless transmission of high-quality music, and maintain extremely high wireless technology quality. However, the transmitting module and receiving module are independent products in the current Bluetooth product design, and the user can only perform one-way transmission during operation. For example, earphones and players with bluetooth transmission functions, or microphones and recorders with bluetooth transmission functions are inconvenient to use.

Please refer to China Taiwan Patent Announcement No. M288753, which discloses a bluetooth playback device, including a playback device, the first and second audio source input units for communicating audio data with the playback device, and an audio playback unit; the playback device It includes a Bluetooth module, an external audio input unit, an audio switch, an audio processor, an audio output/input unit, a control unit, and a power supply unit. The Bluetooth module transmits audio data with the above-mentioned first audio input unit through Bluetooth wireless transmission technology, and the external audio source The input unit is connected to the second audio source input unit for audio transmission. The audio source switch switches one of the two audio source input units as the audio data input path for execution according to the input command of the control unit, and uses the audio output/input unit to transmit the audio data from the input unit. The playback unit plays.

Although the above-mentioned patent provides a function that can automatically switch to mobile communication for voice use when receiving an incoming call signal, and automatically switch back to playing music after the mobile communication mode ends, this switching needs to switch the used communication at the same time. Specifications (for example, Advanced Audio Distribution Protocol (A2DP), Video Remote Control Profile (AVRCP), Headphone Profile (HSP) and Hands-Free Profile (HFP), etc.), the configuration of the switching software is relatively complicated, and the above The Bluetooth playback device cannot use the Advanced Audio Distribution Protocol (A2DP) for audio data transmission, and its external audio source input is transmitted in a wired manner, which is not convenient to use.

Therefore, how to provide a bluetooth wireless multimedia transmission device and system and its method to achieve the purpose of improving the convenience of wireless transmission with simple switching software configuration has become one of the problems to be solved by researchers.

Contents of the invention

The main purpose of the present invention is to provide a bluetooth wireless multimedia transmission device and system and its method, integrate the bluetooth transmitter program with the bluetooth receiver program, and then judge the user's current desire by detecting the general input output (GPIO) signal of the hardware circuit. The operating mode used to improve the convenience of wireless transmission.

To achieve the above purpose, the present invention discloses a Bluetooth wireless multimedia transmission device, which uses the A2DP protocol for audio data transmission, includes a Bluetooth wireless transmission module, has a Bluetooth transmitter mode and a Bluetooth receiver mode, when it is set to When in the bluetooth transmitter mode, the audio data is transmitted to the outside, and when it is set to the bluetooth receiver mode, the audio data is received from the outside; and a mode switching switch is used to selectively switch the bluetooth wireless multimedia transmission device to a bluetooth transmitter mode or Bluetooth receiver mode.

The present invention also discloses a bluetooth wireless multimedia transmission system, which adopts the A2DP protocol for audio data transmission, includes a first bluetooth wireless multimedia transmission device, and has a mode switching switch for setting a bluetooth transmitter mode and a bluetooth receiver mode, When it is set to the bluetooth transmitter mode, transmit audio data to the outside, when it is set to the bluetooth receiver mode, receive audio data from the outside; and the second bluetooth wireless multimedia transmission device, and the first bluetooth wireless multimedia transmission The device communicates.

The present invention also discloses a bluetooth wireless multimedia transmission system, which adopts the A2DP protocol for audio data transmission, including: a first bluetooth wireless multimedia transmission device with a first mode for setting a bluetooth transmitter mode and a bluetooth receiver mode switch, when it is set to bluetooth transmitter mode, transmit audio data to the outside, when it is set to bluetooth receiver mode, receive audio data from the outside; and the second bluetooth wireless multimedia transmission device, and the first bluetooth The wireless multimedia transmission device communicates with the second mode switching switch for setting the Bluetooth transmitter mode and the Bluetooth receiver mode. When the second Bluetooth wireless multimedia transmission device is set to the Bluetooth transmitter mode, it transmits to the first Bluetooth wireless multimedia transmission device. The device sends audio data, and receives the audio data sent by the first Bluetooth wireless multimedia transmission device when the second Bluetooth wireless multimedia transmission device is set to a Bluetooth receiver mode.

In addition, the present invention also discloses a bluetooth wireless multimedia transmission method, which provides a bluetooth wireless multimedia transmission device for audio transmission using the A2DP protocol, which can be selectively switched to a bluetooth transmitter mode or a bluetooth receiver mode, and generates A mode switching signal, first, detect the mode switching signal; when the mode switching signal is in the first state, enable the signal transmission protocol of the A2DP protocol to set the bluetooth wireless multimedia transmission device to the bluetooth transmitter mode; and when the mode When the switching signal is in the second state, the signal receiving protocol of the A2DP protocol is enabled to set the Bluetooth wireless multimedia transmission device as a Bluetooth receiver mode.

Through the aforementioned Bluetooth wireless multimedia transmission device and system and method thereof, the multimedia playback device can have the function of using the A2DP protocol for Bluetooth wireless transmission, which overcomes the disadvantage that the Bluetooth wireless multimedia playback device in the prior art only has one-way transmission, and further improves The convenience of wireless transmission.

Description of drawings

Fig. 1 is the block diagram of bluetooth wireless multimedia transmission device of the present invention;

Fig. 2 is the block diagram of bluetooth wireless multimedia transmission system of the present invention;

3 is a flow chart of the steps of the bluetooth wireless multimedia transmission method according to the first embodiment of the present invention; and

FIG. 4 is a flow chart of the steps of the Bluetooth wireless multimedia transmission method according to the second embodiment of the present invention.

Detailed ways

Please refer to FIG. 1 , which is a block diagram of a Bluetooth wireless multimedia transmission device 10 of the present invention, which uses the A2DP protocol for audio data transmission, and includes a Bluetooth wireless transmission module 11 and a mode switch 12 .

The Bluetooth wireless transmission module 11 has a Bluetooth transmitter mode 11a and a Bluetooth receiver mode 11b. When it is set to the Bluetooth transmitter mode 11a, it is used to transmit audio data to the outside. When it is set to the Bluetooth receiver mode 11b , to receive audio data from the outside, and the Bluetooth wireless transmission module 11 includes a 2.4Ghz antenna circuit, a Bluetooth connection controller (link controller), a Bluetooth connection management (link manager) and a host terminal interface (host terminal interface) in a specific implementation. )wait.

Mode switching switch 12, connected with Bluetooth wireless transmission module 11, in order to selectively switch Bluetooth wireless multimedia transmission device 10 to Bluetooth transmitter mode 11a or Bluetooth receiver mode 11b, wherein the switching of mode switching switch 12 can produce mode switching signal, by judging that the mode switching signal is the first state (such as high level) or the second state (such as low level), it is determined that the Bluetooth wireless multimedia transmission device 10 is set to the Bluetooth transmitter mode 11a or the Bluetooth receiver mode 11b, and the mode switching switch 12 can be realized by a switch circuit such as a button switch or a dip switch in a specific implementation.

Please refer to Fig. 2, which is a block diagram of the Bluetooth wireless multimedia transmission system of the present invention, which adopts the A2DP protocol for audio data transmission, including: a first Bluetooth wireless multimedia transmission device 20, a first multimedia player 40, a first sound source The output device 41 , the second Bluetooth wireless multimedia transmission device 30 , the second multimedia player 50 and the second audio source output device 51 .

The first Bluetooth wireless multimedia transmission device 20 has a first Bluetooth wireless transmission module 21 with a Bluetooth transmitter mode 21a and a Bluetooth receiver mode 21b, and a first mode switching switch for setting the Bluetooth transmitter mode 21a and the Bluetooth receiver mode 21b 22, when it is set to the bluetooth transmitter mode 21a, it is used to transmit audio data to the outside, when it is set to the bluetooth receiver mode 21b, it is used to receive audio data from the outside, and the first bluetooth wireless transmission module 21 The specific implementation includes 2.4Ghz antenna circuit, bluetooth connection controller, bluetooth connection management and host terminal interface, etc.

The first multimedia player 40 is connected with the first bluetooth wireless multimedia transmission device 20 for encoding or decoding the audio data received by the first bluetooth wireless multimedia transmission device 30, and the audio data is output to The second sound source output device 51, in addition, can input audio data into the first multimedia player 40 through the first sound source input device (not shown in the figure), and transmit to the second via the first bluetooth wireless multimedia transmission device 20. Two Bluetooth wireless multimedia transmission devices 30, wherein the operation mode of the first Bluetooth wireless multimedia transmission device 20 needs to be set through the first mode switching switch 22.

The first sound source output device 41 is connected with the first multimedia player 40 to output the sound effect corresponding to the audio data received by the first bluetooth wireless multimedia transmission device 20, and the first sound source output device 41 can be implemented in a specific implementation. For speakers or earphones, etc.

The second multimedia player 50 is connected with the second bluetooth wireless multimedia transmission device 30 for encoding or decoding the audio data received by the second bluetooth wireless multimedia transmission device 30, and the audio source data is output to The second sound source output device 51, in addition, can input the sound source data into the second multimedia player 50 through the second sound source input device (not shown in the figure), and transmit to the second sound source data through the second bluetooth wireless multimedia transmission device 30. A Bluetooth wireless multimedia transmission device 40 , wherein the operation mode of the second Bluetooth wireless multimedia transmission device 30 needs to be set through the second mode switching switch 32 .

The second source of sound output device 51 is connected with the second multimedia player 50, in order to output the sound effect corresponding to the audio data received by the second bluetooth wireless multimedia transmission device 30, and the second source of sound output device 51 can be in specific implementation For speakers or earphones, etc.

The second Bluetooth wireless multimedia transmission device 30 communicates with the first Bluetooth wireless multimedia transmission device 20, including a second Bluetooth wireless transmission module 31 having a Bluetooth transmitter mode 31a and a Bluetooth receiver mode 31b, and setting the Bluetooth transmitter mode 31a and the second mode switching switch 32 of the bluetooth receiver mode 31b, when the second bluetooth wireless multimedia transmission device 30 is set to the bluetooth transmitter mode 31a, in order to send audio data to the first bluetooth wireless multimedia transmission device 20, in When the second Bluetooth wireless multimedia transmission device 30 is set to the Bluetooth receiver mode 31b, it is used to receive the audio data sent by the first Bluetooth wireless multimedia transmission device 20, and the second Bluetooth wireless transmission module 31 includes a 2.4Ghz Antenna circuit, Bluetooth connection controller, Bluetooth connection management and host terminal interface, etc.

In addition, the bluetooth wireless multimedia transmission device disclosed in the present invention can also communicate with common bluetooth wireless transmission devices without the mode switching function, and the description will not be repeated here.

Please refer to Fig. 3, which is a flow chart of the steps of the Bluetooth wireless multimedia transmission method according to the first embodiment of the present invention, providing a Bluetooth wireless multimedia transmission device using the A2DP protocol for sound transmission, which can be selectively switched to Bluetooth transmitter mode or Bluetooth Receiver mode, and produce a mode switching signal, at first, detect this mode switching signal (step 100), in the present embodiment, can be by checking whether the general purpose input output (General Purpose Input Output, GPIO) signal of bluetooth wireless multimedia transmission device Change to confirm whether to trigger the mode switching signal.

When the mode switching signal is detected and confirmed to be the first state (such as high level or low level), the signal transmission protocol of the A2DP protocol is enabled to set the Bluetooth wireless multimedia transmission device to the Bluetooth transmitter mode ( Step 101); when the mode switch signal is in the second state (such as low level or high level), then enable the signal receiving protocol of the A2DP protocol to set the bluetooth wireless multimedia transmission device to the bluetooth receiver mode (step 102).

Please refer to FIG. 4, which is a flow chart of the steps of the Bluetooth wireless multimedia transmission method according to the second embodiment of the present invention, providing a Bluetooth wireless multimedia transmission device for audio transmission using the A2DP protocol, which can be selectively switched to Bluetooth transmitter mode or Bluetooth receiver mode. mode, at first, obtain a mode switching command (step 200); enable the signaling protocol of the A2DP protocol (step 201), in this embodiment, in the program of the application layer, the shareable sub-function formula (for example, a2dpopencfm()) is merged into a sub-function, and shared variables and structure (structure), in order to reduce the length of the program code, that is, enable the signaling protocol of the A2DP protocol.

Then, the Bluetooth wireless multimedia transmission device is set to the Bluetooth transmitter mode, in order to transmit audio data to the outside (for example, adopt sub-band coding (Subband Coding, SBC), MPEG1, MPEG2, AAC or ATRAC audio frequency codec format data) (step 202), in this embodiment, the mode switching variable (for example, Global) can be changed to ^** 1 ^** or ^** 0 ^** to set the mode of operation of the Bluetooth wireless multimedia transmission device; again Obtain a mode switching command (step 203); enable the signal receiving protocol of the A2DP protocol (step 204); finally, set the Bluetooth wireless multimedia transmission device to the Bluetooth receiver mode to receive audio data (step 205).

In addition, the steps 200 and 201 mentioned in the second embodiment of the present invention can also be changed to enable the signal receiving protocol of the A2DP protocol, and the subsequent steps can be modified accordingly, and the description will not be repeated here.

Claims (12)

1. A bluetooth wireless multimedia transmission device, which adopts Advanced Audio Distribution Profile (Advanced Audio Distribution Profile, A2DP protocol) to carry out audio data transmission, is characterized in that, this bluetooth wireless multimedia transmission device includes: A bluetooth wireless transmission module, with a bluetooth transmitter mode and a bluetooth receiver mode, when set to the bluetooth transmitter mode, send audio data to the outside, when set to the bluetooth receiver mode, receive from the outside audio data; and A mode switching switch is used to selectively switch the bluetooth wireless multimedia transmission device to the bluetooth transmitter mode or the bluetooth receiver mode. 2. The bluetooth wireless multimedia transmission device as claimed in claim 1, characterized in that: when the mode switching switch is switched, a mode switching signal is also generated for setting the bluetooth wireless transmission module to the bluetooth transmitter mode or Bluetooth receiver mode. 3. The Bluetooth wireless multimedia transmission device as claimed in claim 1, wherein the mode switching switch is a button switch. 4. The bluetooth wireless multimedia transmission device according to claim 1, wherein the mode switching switch is a dip switch. 5. A bluetooth wireless multimedia transmission system, which adopts the A2DP protocol for audio data transmission, the bluetooth wireless multimedia transmission system at least includes a first bluetooth wireless multimedia transmission device and a second bluetooth wireless multimedia transmission device, characterized in that: The first bluetooth wireless multimedia transmission device has a first bluetooth wireless transmission module with a bluetooth transmitter mode and a bluetooth receiver mode, and a mode switching switch for setting the bluetooth transmitter mode and bluetooth receiver mode; when it When it is set to the bluetooth transmitter mode, it sends audio data to the outside, when it is set to the bluetooth receiver mode, it receives the audio data from the outside; and The second Bluetooth wireless multimedia transmission device communicates with the first Bluetooth wireless multimedia transmission device. 6. The bluetooth wireless multimedia transmission system as claimed in claim 5, characterized in that: when the mode switching switch is switched, a mode switching signal is also generated to set the first bluetooth wireless transmission module as the bluetooth transmitter mode or Bluetooth receiver mode. 7. The Bluetooth wireless multimedia transmission system as claimed in claim 5, wherein the mode switching switch is a button switch. 8. The Bluetooth wireless multimedia transmission system as claimed in claim 5, wherein the mode switching switch is a dip switch. 9. A bluetooth wireless multimedia transmission system, which adopts the A2DP protocol for audio data transmission, the bluetooth wireless multimedia transmission system at least includes a first bluetooth wireless multimedia transmission device and a second bluetooth wireless multimedia transmission device, characterized in that: The first bluetooth wireless multimedia transmission device has a first bluetooth wireless transmission module with a bluetooth transmitter mode and a bluetooth receiver mode, and a first mode switching switch for setting the bluetooth transmitter mode and bluetooth receiver mode , when it is set to the bluetooth transmitter mode, it sends audio data to the outside, when it is set to the bluetooth receiver mode, it receives audio data from the outside; and The second Bluetooth wireless multimedia transmission device communicates with the first Bluetooth wireless multimedia transmission device, has a second Bluetooth wireless transmission module with a Bluetooth transmitter mode and a Bluetooth receiver mode, and sets the Bluetooth transmitter mode and Bluetooth A second mode switching switch of the receiver mode, when the second bluetooth wireless multimedia transmission device is set to the bluetooth transmitter mode, send audio data to the first bluetooth wireless multimedia transmission device, in the second bluetooth wireless multimedia transmission device When the transmission device is set to the bluetooth receiver mode, it receives the audio data sent from the first bluetooth wireless multimedia transmission device. 10. Bluetooth wireless multimedia transmission system as claimed in claim 9, is characterized in that, this first Bluetooth wireless multimedia transmission device also includes: A first multimedia player, encoding/decoding processing the audio data; and A first sound source output device, outputting sound effects corresponding to the audio data received by the first Bluetooth wireless multimedia transmission device. 11. Bluetooth wireless multimedia transmission system as claimed in claim 9, is characterized in that, this second Bluetooth wireless multimedia transmission device also comprises: A second multimedia player, encoding/decoding the audio data; and A second sound source output device, outputting the sound effect corresponding to the audio data received by the second Bluetooth wireless multimedia transmission device. 12. A bluetooth wireless multimedia transmission method, providing a bluetooth wireless multimedia transmission device that adopts the A2DP protocol for sound transmission, characterized in that the bluetooth wireless multimedia device can be selectively switched to a bluetooth transmitter mode or a bluetooth receiver mode, and generate a mode switching signal, the bluetooth wireless multimedia transmission method includes: detecting the mode switching signal; When the mode switch signal is in a first state, enable a signal transmission protocol of the A2DP protocol to set the Bluetooth wireless multimedia transmission device as the Bluetooth transmitter mode; and When the mode switching signal is in a second state, a signal receiving protocol of the A2DP protocol is activated to set the Bluetooth wireless multimedia transmission device as the Bluetooth receiver mode.

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