CN111385775A - A wireless transmission system and method thereof - Google Patents

Abstract

A wireless transmission system and its method, apply to the bluetooth wireless communication environment, the mobile phone will transmit several compressed data more than user App broadcast speed in user App broadcast initial stage, in order to can set up the compressed data of many for reading in the buffer rapidly; then, the Bluetooth message receiving device reads a plurality of compressed data from the buffer area, decompresses the data and outputs sound, extracts the compressed data from the buffer area and decompresses the sound without filling the compressed data in the buffer area, but only receives a plurality of packets to start playing according to the setting without filling the compressed data in the buffer area, thereby effectively shortening the start playing time of App of a user.

Description

A wireless transmission system and method thereof

technical field

The invention relates to a transmission system and a method thereof, and more particularly, to a wireless transmission system and a method thereof applied to a Bluetooth wireless communication environment, which can reduce the transmission of audio data from a mobile phone to a Bluetooth audio receiving device through the Bluetooth audio transmission model protocol A2DP connection. Delay time between sounds.

Background technique

For existing Bluetooth audio devices (such as mobile phones) to process audio data, the delay time for Android mobile phones to transmit audio data to Bluetooth audio receiving devices (such as headphones) using the Bluetooth audio transmission model protocol A2DP connection is generally 150-200ms. , the user can accept the music when listening to music by using a Bluetooth audio receiving device (eg, earphone), but when watching a video or playing a game, the audio and video may feel out of sync, and the sound response is slow.

The way that the mobile phone transmits the audio data is to divide the block regularly and quantitatively, and transmit it to the earphone according to the audio playback speed.

Since the audio data is transmitted wirelessly, there will be packet errors and loss caused by interference or device movement, so that the headset cannot receive the audio data and the sound will be cut off. In order to reduce the chance of audio interruption, the headphone terminal will store the received audio data in the jitter buffer first, and wait until the buffer is stored to a predetermined size, such as 150ms, before starting to extract the audio data from the buffer and decode the output. sound. The size of this buffer accounts for a large part of the entire delay time. Reducing the buffer and optimizing its application can effectively reduce the delay, and the size of the buffer should not be too small, so as to avoid sound interruptions.

Taiwan Publication/Announcement No. I395442 "Communication technology in a dual-protocol environment" is a communication technology in an environment where interference from a signal associated with one communication protocol may hinder reception of a signal associated with the other communication protocol, and discloses a communication device , which includes: a first communication system for transmitting and/or receiving signals according to a first protocol; a second communication system for transmitting and/or receiving signals according to a second protocol, the second protocol having to enable a receiving The ability of a transmitter to indicate to a transmitter that it is in a non-responsive state, whereby when the transmitter is in the non-responsive state, it is prohibited from transmitting data to the receiver; used to detect the first protocol in the signal a signal activity detector that is active; and a control unit responsive to the signal activity detector for causing the second communication system to indicate that it is in a non-responsive state.

Taiwan Publication/Announcement No. I246265 "Bluetooth Device and Combined Bluetooth Audio Device" is to provide a Bluetooth device suitable for coupling to an audio device, so that users can listen to the sound signal provided by the audio device. Still capable of timely answering incoming calls received by a mobile communication device, a bluetooth device is disclosed, which is suitable for coupling a stereo headset microphone and an audio device, and is suitable for transmitting and receiving signals to a mobile communication device. The bluetooth device mainly includes a female jack, a bluetooth transceiver and an audio source input end. The female jack is used for coupling the stereo headset microphone. The bluetooth transceiver is coupled to the female jack and used for transmitting and receiving signals provided by the mobile communication device. The audio input end is coupled to the female socket and used for coupling to the audio device. Wherein, when the Bluetooth transceiver receives the incoming call signal provided by the mobile communication device, the sound signal transmitted to the stereo headset microphone is switched to the sound signal provided by the mobile communication device. In addition, the above-mentioned Bluetooth device can also be directly used as a Bluetooth headset after adding a microphone and a speaker.

Taiwan Publication/Announcement No. I572155 "Multi-function Bluetooth device and Bluetooth connection method" is a multi-function Bluetooth device that can be connected to electronic devices through different service discovery protocols, so that the multi-function Bluetooth device has multiple functions. The Bluetooth device stores a plurality of service discovery protocols, and can connect with other electronic devices having a Bluetooth interface through one of the stored service discovery protocols. The multifunctional Bluetooth device can be connected with the electronic device through the first service discovery protocol, and can transmit sound signals with the connected electronic device through Bluetooth. In addition, the multi-function Bluetooth device can also connect with the electronic device through the second service discovery protocol, and transmit control signals to the connected electronic device through Bluetooth, so as to control the electronic device to perform a specific function.

China Taiwan Publication/Announcement No. I563859 "Bluetooth audio packet sharing method" is a Bluetooth audio packet sharing method, which enables multiple Bluetooth sound-emitting devices to receive and play audio packets transmitted by electronic devices; the sharing method mainly includes an electronic device, a first bluetooth sounding device and at least one second bluetooth sounding device. The electronic device and the first bluetooth sounding device establish a bluetooth connection between them through a bluetooth connection data, wherein the first bluetooth sounding device can receive the audio packets transmitted by the electronic device and broadcast the bluetooth connection data. The second bluetooth sounding device is adjacent to the electronic device and the first bluetooth sounding device, and can receive the bluetooth connection data broadcast by the first bluetooth sounding device. The second bluetooth sounding device can receive or share the audio packets sent by the electronic device through the bluetooth connection data, thereby enabling multiple bluetooth sounding devices to receive and play the audio packets sent by the electronic device.

China Taiwan Publication/Announcement No. I563806 "Bluetooth device and method for controlling Bluetooth device or wireless device" provides a method for controlling Bluetooth device energy saving, including: establishing a Bluetooth link; controlling the Bluetooth device to enter a listening mode; The listening anchor is processed after preparation and before sleep preparation; and the wakeup operation is processed between the wakeup preparation and the sleep preparation. The wake-up operation is a Bluetooth operation, a Bluetooth Low Energy BLE operation, or a Wi-Fi operation. Correspondingly, a Bluetooth device and a method for controlling a wireless device are also provided. The number of wake-up/sleep preparations can be minimized, thus effectively reducing the power consumption of Bluetooth devices.

Taiwan Publication/Announcement No. I449381 "Communication method and Bluetooth device" is a communication method and Bluetooth device that can optimize the use efficiency of a Bluetooth slot in a scatternet, wherein the communication method uses A Bluetooth device in a scatternet including a first piconet and a second piconet. The communication method includes: transmitting data to a peer-to-peer device in the first piconet; judging whether there is buffered data to be transmitted to the peer-to-peer device in the first piconet to generate a judgment result; and according to the judgment The result allocates slots in the first piconet and the second piconet. The provided communication method can increase or optimize the usage efficiency of the Bluetooth slot in the Bluetooth device.

Therefore, how to solve the problem of how to reduce the time between the mobile phone passing the audio data through the Bluetooth audio transmission model protocol A2DP connection to the Bluetooth audio receiving device (such as the earphone) for the audio data processing for the Bluetooth audio device (for example, the mobile phone) at present How to shorten the delay time (usually 150-200ms) of sending audio data from a mobile phone (using the Bluetooth audio transmission model protocol A2DP connection) to a Bluetooth audio receiving device (such as a headset), and the user uses the Bluetooth audio to receive The device (for example, the headset) will not feel the video and audio out of sync when watching videos or playing games, and the sound response will not be slow; Only then will the audio data be extracted from the buffer and decoded to output the sound, and the buffer can be reduced and its application can be optimized to effectively reduce the delay; in other words, all of the above are problems to be solved.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a wireless transmission system and a method thereof, which are applied in a Bluetooth wireless communication environment. When using the wireless transmission system of the present invention to perform a wireless transmission method process, firstly, a connection operation is performed, and the Bluetooth audio receiving device and the The mobile phone establishes a Bluetooth audio transmission model protocol A2DP connection; then, performs data compression and transmission. The Bluetooth A2DP function module in the mobile phone receives the audio data from the user App and encodes it with PCM (Pulse-Code Modulation). The compressed data will be transmitted to the Bluetooth audio receiving device through the Bluetooth audio transmission model protocol A2DP connection of the mobile phone; then, the receiving operation is performed, and the Bluetooth audio receiving device receives the transmission from the mobile phone. At least one piece of compressed data is put into its buffer (jitterbuffer). Here, the mobile phone will send several pieces of compressed data faster than the playback speed of the user App in the initial stage of the user App, so that it can be buffered. In the area, multiple compressed data that can be read are quickly created; then, the decompression operation is performed. The decompression processing module in the Bluetooth audio receiving device will read multiple compressed data from the buffer, and output after decompression. Here, when performing the decompression operation, the decompression module does not need to wait for the compressed data in the buffer to be filled before extracting the compressed data from the buffer and decompressing the output sound, but according to the setting, it does not need to wait for the compressed data in the buffer to be filled. When it is full, the broadcast can be started as long as a few packets are received, which can effectively shorten the start-up time of the user's App.

Another object of the present invention is to provide a wireless transmission system and method thereof, which can be applied in a Bluetooth wireless communication environment, which can reduce the transmission of audio data from a mobile phone to a Bluetooth audio receiving device (for example, a Bluetooth audio transmission model protocol A2DP connection) In addition, the delay time (usually 150-200ms) of the mobile phone (using the Bluetooth audio transmission model protocol A2DP connection) to transmit audio data to the Bluetooth audio receiving device (such as a headset) is shortened , the user will not feel that the audio and video are out of sync when watching a video or playing a game by using the Bluetooth audio receiving device (eg, earphone), and the sound response will not be slow.

Another object of the present invention is to provide a wireless transmission system and method thereof, which are applied in a Bluetooth wireless communication environment, and the earphone does not need to wait until the buffer (received audio data) is stored in a predetermined size, such as 150ms, before Starting to extract audio data from the buffer and decode the output sound, reducing the buffer and optimizing its application can effectively reduce the delay.

According to the above-mentioned purpose, the present invention provides a wireless transmission system, which is applied in a Bluetooth wireless communication environment. The wireless transmission system includes a Bluetooth A2DP function module and a decompression processing module.

Bluetooth A2DP function module, the Bluetooth audio receiving device and the mobile phone establish a Bluetooth audio transmission model agreement A2DP connection, the Bluetooth A2DP function module in the mobile phone receives the audio data from the user App, and uses PCM (Pulse-Code Modulation, pulse coding) Modulation) coding method to compress the audio data, the compressed data will be transmitted to the Bluetooth audio receiving device through the Bluetooth audio transmission model protocol A2DP connection of the mobile phone.

The decompression processing module, the Bluetooth audio receiving device receives at least one piece of compressed data from the mobile phone and puts it into its jitter buffer. The user App plays several compressed data with high speed, so that multiple compressed data can be quickly created in the buffer for reading; in addition, the decompression processing module in the Bluetooth audio receiving device will be read from the buffer. Take multiple pieces of compressed data, decompress and output sound. Here, when performing decompression, the decompression module does not need to wait for the buffer to be filled with compressed data before extracting the compressed data from the buffer and decompressing it to output the sound. Instead, according to the settings, there is no need to wait for the compressed data in the buffer to fill up, as long as a few packets are received, the broadcast can be started, which can effectively shorten the start-up time of the user's App.

When using the wireless transmission system of the present invention to perform the process of the wireless transmission method, firstly, a connection operation is performed, and the Bluetooth audio receiving device and the mobile phone establish a Bluetooth audio transmission model protocol A2DP connection.

Then, the data compression transmission is performed. The Bluetooth A2DP function module in the mobile phone receives the audio data from the user App, and compresses the audio data by PCM (Pulse-Code Modulation) encoding. The compressed data will be transmitted to the Bluetooth audio receiving device through the Bluetooth audio transmission model protocol A2DP connection of the mobile phone.

Then, the receiving operation is performed, and the Bluetooth audio receiving device receives at least one piece of compressed data from the mobile phone and puts it into its jitter buffer. The user App plays several compressed data with high speed, so that multiple compressed data for reading can be quickly created in the buffer.

Then, the decompression operation is performed, and the decompression processing module in the Bluetooth audio receiving device will read multiple compressed data from the buffer, and output the sound after decompression. Here, when the decompression operation is performed, the decompression module It is not necessary to wait for the compressed data in the buffer to be filled before extracting the compressed data from the buffer and decompressing the output sound, but according to the setting, there is no need to wait for the compressed data in the buffer to fill up, as long as a few packets are received, the broadcast can be started, which is effective Shorten the start-up time of the user's App.

In order to make those skilled in the art understand the purpose, features and technical effects of the present invention, the present invention is described in detail as follows through the following specific embodiments and in conjunction with the accompanying drawings:

Description of drawings

FIG. 1 is a schematic diagram of a system for illustrating the system architecture and operation of the wireless transmission system of the present invention;

FIG. 2 is a flow chart for illustrating the flow steps of a wireless communication method using the wireless transmission system of the present invention as shown in FIG. 1;

FIG. 3 is a schematic diagram for illustrating an embodiment of the wireless transmission system of the present invention and an operation situation; and

FIG. 4 is a flowchart illustrating a process step of a wireless communication method using an embodiment of the wireless transmission system of the present invention as shown in FIG. 3 .

Description of reference numbers:

1 Wireless transmission system

2 Bluetooth A2DP function module

3 Decompression processing module

4 mobile phone

5 Bluetooth audio receiver

101 102 103 104 Steps

201 202 203 204 steps

Detailed ways

FIG. 1 is a schematic diagram of a system for illustrating the system architecture and operation of the wireless transmission system of the present invention. As shown in FIG. 1 , the wireless transmission system 1 includes a Bluetooth A2DP function module 2 and a decompression processing module 3 .

Bluetooth A2DP function module 2, the Bluetooth audio receiving device and the mobile phone establish a Bluetooth audio transmission model protocol A2DP connection, the Bluetooth A2DP function module 2 in the mobile phone receives the audio data from the user App, and uses PCM (Pulse-Code Modulation) , Pulse Code Modulation) encoding method to compress audio data, the compressed data will be transmitted to the Bluetooth audio receiving device through the Bluetooth audio transmission model protocol A2DP connection of the mobile phone.

Decompression processing module 3, the Bluetooth audio receiving device receives at least one piece of compressed data from the mobile phone and puts it into its jitter buffer. The user App plays several compressed data with high speed, so that multiple compressed data that can be read can be quickly created in the buffer; The decompression module 3 does not need to wait for the compressed data in the buffer to be filled before extracting the compressed data from the buffer and decompressing it. To output sound, according to the settings, there is no need to wait for the compressed data in the buffer to fill up, and it can start playing as long as a few packets are received, which can effectively shorten the start-up time of the user's App.

FIG. 2 is a flow chart illustrating the process steps of a wireless transmission method using the wireless transmission system of the present invention as shown in FIG. 1 . As shown in FIG. 2 , first, in step 101 , a connection operation is performed, the Bluetooth audio receiving device and the mobile phone establish a Bluetooth audio transmission model protocol A2DP connection, and the process proceeds to step 102 .

In step 102, a data compression transmission operation is performed; the Bluetooth A2DP function module 2 in the mobile phone receives the audio data from the user App, and compresses the audio data in a PCM (Pulse-Code Modulation, pulse code modulation) encoding method, The compressed compressed data will be transmitted to the Bluetooth audio receiving device through the Bluetooth audio transmission model protocol A2DP connection of the mobile phone, and the process goes to step 103 .

In step 103, a receiving operation is performed; the Bluetooth audio receiving device receives at least one piece of compressed data from the mobile phone and puts it into its jitter buffer. Send several pieces of compressed data faster than the playback speed of the user App, so that multiple pieces of compressed data that can be read can be quickly created in the buffer, and go to step 104 .

In step 104, a decompression operation is performed; the decompression processing module 3 in the Bluetooth audio receiving device will read multiple compressed data from the buffer, decompress and output the sound. Here, when the decompression operation is performed, decompression The compression module does not need to wait for the compressed data in the buffer to be filled before extracting the compressed data from the buffer and decompressing the output sound. Instead, according to the settings, it does not need to wait for the compressed data in the buffer to fill up. It can start broadcasting as long as it receives a few packets. It can effectively shorten the user's App start-up time.

FIG. 3 is a schematic diagram for illustrating an embodiment of the wireless transmission system of the present invention and its operation. As shown in FIG. 3 , the wireless transmission system 1 includes a Bluetooth A2DP function module 2 and a decompression processing module 3 .

A Bluetooth A2DP function module 2, a Bluetooth audio receiving device 5, such as a headset, and a mobile phone 4, such as an Android mobile phone, establish a Bluetooth audio transmission model protocol A2DP connection, the Bluetooth A2DP function module 2 in the mobile phone 4 The audio data of the App, and the audio data is compressed by PCM (Pulse-Code Modulation) encoding method. The compressed compressed data will be transmitted to the mobile phone 4 through the Bluetooth audio transmission model protocol A2DP connection of the mobile phone 4. Bluetooth audio receiver 5.

The decompression processing module 3, the Bluetooth audio receiving device 5, such as an earphone, receives at least one piece of compressed data from the mobile phone 4 and puts it into its jitter buffer. Here, the mobile phone 4 is used for the user In the initial stage of the App, it will transmit several compressed data that is faster than the user App playing speed, so that multiple compressed data can be quickly created for reading in the buffer; in addition, in the Bluetooth audio receiving device 5 The decompression processing module 3 will read multiple compressed data from the buffer, and output sound after decompression. Here, when the decompression is performed, the decompression module 3 does not need to wait for the buffer to be filled with compressed data before performing the decompression. The buffer extracts the compressed data, and decompresses the output sound. According to the settings, there is no need to wait for the compressed data in the buffer to fill up. It only needs to receive a few packets to start the broadcast, which can effectively shorten the start-up time of the user's App.

In this embodiment, for example, taking the buffer size of the Bluetooth audio receiving device 5 (such as a headset) as 60ms, if the mobile phone 4 transmits 10ms more audio data every 20ms in the initial stage of broadcasting, it is equivalent to transmitting 30ms of audio data every 20ms. Audio data, after 6 times (10x6=60), the buffer of the Bluetooth audio receiving device 5 (for example, earphones) can be filled up; the mobile phone 4 will send audio data longer than the playback time to the Bluetooth audio receiving device at the beginning of the broadcast 5 (for example, earphones), the extra data is the buffer size of the Bluetooth audio receiving device 5 (for example, earphones), for example, 60ms.

Furthermore, the Bluetooth audio receiving device 5 (eg, earphones) does not have to wait for the existing buffer (eg, 150ms) to fill up. Taking the buffer size of 60ms as an example, if the mobile phone 4 will transmit more than the playback speed at the initial stage of broadcasting. For example, 10ms of audio data will be transmitted every 20ms, which means 30ms of audio data will be transmitted every 20ms. After 6 times (10x6=60), the Bluetooth audio receiving device 5 (such as a headset) can quickly create a buffer ( 60ms) and can be filled, in other words, the broadcast can be started as long as a few packets are received, which can effectively shorten the start-up time.

In this embodiment, the buffer size of the Bluetooth audio receiving device 5 (eg, earphones) is 60ms. However, the buffer size can be set according to actual needs. In other words, the buffer size in the present invention is not limited to 60ms. The buffers of other values to be set have the same principles and are similar to those described in this embodiment, and therefore are not repeated here.

FIG. 4 is a flowchart illustrating a process step of a wireless transmission method using an embodiment of the wireless transmission system of the present invention as shown in FIG. 3 . As shown in FIG. 4 , first, in step 201 , a connection operation is performed, the Bluetooth audio receiving device 5 and the mobile phone 4 establish a Bluetooth audio transmission model protocol A2DP connection, and the process proceeds to step 202 .

In step 202, a data compression transmission operation is performed; the Bluetooth A2DP function module 2 in the mobile phone 4 receives the audio data from the user App, and compresses the audio data by PCM (Pulse-Code Modulation, pulse code modulation) encoding method, The compressed compressed data will be transmitted to the Bluetooth audio receiving device 5 through the Bluetooth audio transmission profile protocol A2DP connection of the mobile phone 4 , and the process goes to step 203 .

In step 203, a receiving operation is performed; the Bluetooth audio receiving device 5 receives at least one piece of compressed data from the mobile phone 4 and puts it into its jitter buffer. Here, the mobile phone 4 starts broadcasting in the user App In the initial stage, several pieces of compressed data that are faster than the playback speed of the user App will be transmitted, so that multiple pieces of compressed data that can be read can be quickly created in the buffer, and the process goes to step 204 .

In step 204, a decompression operation is performed; the decompression processing module 3 in the Bluetooth audio receiving device 5 will read multiple compressed data from the buffer, decompress and output the sound. Here, when the decompression operation is performed, The decompression module 3 does not need to wait for the compressed data in the buffer to be filled before extracting the compressed data from the buffer and decompressing the output sound, but according to the setting, it does not need to wait for the compressed data in the buffer to fill up, as long as it receives a few packets to start. It can effectively shorten the user's App start-up time.

In this embodiment, for example, taking the buffer size of the Bluetooth audio receiving device 5 (such as a headset) as 60ms, if the mobile phone 4 transmits 10ms more audio data every 20ms in the initial stage of broadcasting, it is equivalent to transmitting 30ms of audio data every 20ms. Audio data, after 6 times (10x6=60), the buffer of the Bluetooth audio receiving device 5 (for example, earphones) can be filled up; the mobile phone 4 will send audio data longer than the playback time to the Bluetooth audio receiving device at the beginning of the broadcast 5 (for example, earphones), the extra data is the buffer size of the Bluetooth audio receiving device 5 (for example, earphones), for example, 60ms.

Furthermore, the Bluetooth audio receiving device 5 (eg, earphones) does not have to wait for the existing buffer (eg, 150ms) to fill up. Taking the buffer size of 60ms as an example, if the mobile phone 4 will transmit more than the playback speed at the initial stage of broadcasting. For example, 10ms of audio data will be transmitted every 20ms, which means 30ms of audio data will be transmitted every 20ms. After 6 times (10x6=60), the Bluetooth audio receiving device 5 (such as a headset) can quickly create a buffer ( 60ms) and can be filled, in other words, the broadcast can be started as long as a few packets are received, which can effectively shorten the start-up time.

In this embodiment, the buffer size of the Bluetooth audio receiving device 5 (eg, earphones) is 60ms. However, the buffer size can be set according to actual needs. In other words, the buffer size in the present invention is not limited to 60ms. The buffers of other values to be set have the same principles and are similar to those described in this embodiment, and therefore are not repeated here.

Combining the above embodiments, we can obtain a wireless transmission system and method of the present invention, which are applied in the Bluetooth wireless communication environment. A Bluetooth audio transmission model protocol A2DP connection is established between the Bluetooth audio receiving device and the mobile phone; then, data compression and transmission are performed. The Bluetooth A2DP function module in the mobile phone receives the audio data from the user App and uses PCM (Pulse-Code Modulation) , Pulse Code Modulation) encoding method to compress audio data, the compressed data will be transmitted to the Bluetooth audio receiving device through the Bluetooth audio transmission model protocol A2DP connection of the mobile phone; then, the receiving operation is performed, and the Bluetooth audio receiving device Receive at least one piece of compressed data from the mobile phone and put it into its jitter buffer. Here, the mobile phone will send several pieces of data that are faster than the user's App playback speed at the initial stage of the user's App. Compress the data, so that multiple compressed data that can be read can be quickly created in the buffer; then, perform decompression, and the decompression processing module in the Bluetooth audio receiving device will read multiple compressed data from the buffer. Compress the data, decompress it and output the sound. Here, when performing the decompression action, the decompression module does not need to wait for the compressed data in the buffer to be filled before extracting the compressed data from the buffer and decompressing and outputting the sound. There is no need to wait for the compressed data in the buffer to fill up, as long as a few packets are received, the broadcast can be started, which can effectively shorten the start-up time of the user's App. The wireless transmission system and method thereof of the present invention include the following advantages:

1. During the decompression operation, the decompression module does not need to wait for the compressed data in the buffer to be filled before extracting the compressed data from the buffer and decompressing the output sound, but according to the setting, it does not need to wait for the compressed data in the buffer to fill up, as long as The broadcast can be started after receiving a few packets, which can effectively shorten the start-up time of the user's App.

2. It can reduce the delay time between the mobile phone transmitting audio data through the Bluetooth audio transmission model protocol A2DP connection to the Bluetooth audio receiving device (for example, earphones) to produce sound; in addition, connecting the mobile phone (using the Bluetooth audio transmission model protocol A2DP connection) The delay time (usually 150-200ms) of transmitting audio data to a Bluetooth audio receiving device (such as a headset) is shortened, and users will not feel the audio and video when watching a video or playing a game using a Bluetooth audio receiving device (such as a headset). Out of sync, the sound response is not sluggish.

3. The headset does not need to wait until the buffer (received audio data) is stored to a predetermined size, such as 150ms, before it starts to extract the audio data from the buffer and decode the output sound. It can reduce the buffer and optimize its application to effectively reduce the delay. .

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention; all other equivalent changes or modifications made without departing from the disclosed spirit of the present invention shall be included in the claims.

Claims (10)

1. A wireless transmission method, applied in a Bluetooth wireless communication environment, comprising the following programs: Carry out the connection action; the Bluetooth audio receiving device and the mobile phone establish a Bluetooth audio transmission model protocol A2DP connection; Perform data compression and transmission; the mobile phone compresses the audio data of the user App by PCM encoding, and the compressed compressed data will be transmitted to the mobile phone through the Bluetooth audio transmission model protocol A2DP connection of the mobile phone. the Bluetooth audio receiving device; performing a receiving action, the Bluetooth audio receiving device receives at least one piece of the compressed data from the mobile phone and puts it into its buffer; and A decompression operation is performed, and the Bluetooth audio receiving device will read multiple pieces of the compressed data from the buffer, and output sound after decompression. 2 . The wireless transmission method of claim 1 , wherein, during the receiving operation, the mobile phone transmits the compressed data with a higher playback speed than the user App at the initial stage of the user App playing, 2 . In order to quickly create multiple pieces of the compressed data that can be read in the buffer. 3. The wireless transmission method as claimed in claim 1 , wherein, when performing the decompression operation, the compressed data is extracted from the buffer without waiting for the buffer to be filled, and the sound is output after decompression, but according to The setting does not need to wait for the buffer to fill up, as long as a few packets are received, the broadcast can be started. 4. The wireless transmission method of claim 1, wherein the Bluetooth audio receiving device is an earphone. 5. The wireless transmission method of claim 1, wherein the mobile phone is an Android mobile phone. 6. A wireless transmission system, applied in a Bluetooth wireless communication environment, comprising: Bluetooth A2DP function module, after the Bluetooth audio receiving device and the mobile phone establish a Bluetooth audio transmission model agreement A2DP connection, the Bluetooth A2DP function module in the mobile phone receives the audio data from the user App and compresses the audio by PCM encoding. data, compressed data, will be transmitted to the Bluetooth audio receiving device through the Bluetooth audio transmission model protocol A2DP connection of the mobile phone; and A decompression processing module, the bluetooth audio receiving device receives at least one piece of the compressed data from the mobile phone and puts it into its buffer; the decompression processing module in the bluetooth audio receiving device will use the buffer Read multiple pieces of the compressed data, and output sound after decompression. 7. The wireless transmission system as claimed in claim 6, wherein the mobile phone transmits the compressed data with a higher playback speed than the user App in the initial stage of the user App, so as to be able to store the compressed data in the buffer. The compressed data is quickly built up for reading in multiples. 8. The wireless transmission system as claimed in claim 6, wherein the compressed data is extracted from the buffer without waiting for the buffer to be filled, and the audio is output after decompression, but according to the setting, there is no need to wait for the buffer When it is full, it can start broadcasting as long as it receives a few packets. 9. The wireless transmission system of claim 6, wherein the Bluetooth audio receiving device is an earphone. 10. The wireless transmission system of claim 6, wherein the mobile phone is an Android mobile phone.

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