CN108847248B - Bluetooth device audio processing method, system, readable storage medium and Bluetooth device - Google Patents

Abstract

The invention relates to a Bluetooth device audio processing method, system, readable storage medium and Bluetooth device, belonging to the technical field of audio processing. When a first audio data packet to be played is received, it is preprocessed to obtain channel independence. The frequency domain data of the independent channel is respectively compressed and encoded to obtain the corresponding second audio data packet. According to the audio playback requirements of the Bluetooth slave device, the first audio data packet of the corresponding channel is selected from the second audio data packet. Three audio data packets, encapsulated into Bluetooth data packets and transmitted to the Bluetooth slave device, the Bluetooth slave device can play the audio of the corresponding channel; the Bluetooth host device compresses and encodes the audio data, and transmits it according to the audio playback requirements of the Bluetooth slave device. The audio data package corresponding to the channel can greatly reduce the amount of audio data transmission, reduce the corresponding buffer space, and at the same time maintain the audio quality when the Bluetooth slave device plays audio with independent channels, thereby improving the performance of the Bluetooth device.

Description

Bluetooth device audio processing method, system, readable storage medium and Bluetooth device

technical field

The present invention relates to the technical field of audio processing, and in particular, to a Bluetooth device audio processing method, system, readable storage medium and Bluetooth device.

Background technique

With the development of audio technology, the application of multi-channel analog stereo technology is becoming more and more extensive. The application of multi-channel analog stereo technology to the advanced audio of Bluetooth devices can truly reproduce the sound of the original sound field, which can bring better listening effects to users.

At present, when the Bluetooth device outputs audio, the Bluetooth host device needs to forward the audio stream to the Bluetooth slave device. When performing multi-channel audio output, the amount of audio data that needs to be forwarded increases greatly, which increases the pressure on data bandwidth and reduces the Performance of Bluetooth devices.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide a Bluetooth device audio processing method, system, readable storage medium and Bluetooth device for the problem that the Bluetooth device is out of synchronization due to audio data packet loss.

A Bluetooth device audio processing method, comprising the following steps:

When receiving the first audio data packet to be played, preprocessing the first audio data packet to obtain channel-independent frequency domain data;

Compressing and encoding the frequency domain data of different channels respectively to obtain the second audio data packet of the corresponding channel;

According to the audio playback requirement of the Bluetooth slave device, a third audio data packet is selected from each second audio data packet, wherein the third audio data packet corresponds to the channel in the audio playback requirement;

The third audio data packet is encapsulated into the Bluetooth data packet, and the Bluetooth data packet is transmitted to the Bluetooth slave device.

According to the above-mentioned audio processing method for a Bluetooth device, when the first audio data packet to be played is received, it is preprocessed to obtain frequency-domain data with independent channels, and the frequency-domain data of the independent channels are respectively compressed and encoded. , obtain the corresponding second audio data packet, select the third audio data packet of the corresponding channel from the second audio data packet according to the audio playback requirements of the Bluetooth slave device, encapsulate it into the Bluetooth data packet, and transmit the Bluetooth data packet To the Bluetooth slave device, the Bluetooth slave device can play the audio of the corresponding channel; the above method can be applied to the Bluetooth host device, the Bluetooth host device compresses and encodes the audio data, and transmits the corresponding sound according to the audio playback requirements of the Bluetooth slave device. It can greatly reduce the amount of audio data transmission, reduce the corresponding buffer space, and at the same time maintain the audio quality when the Bluetooth slave device plays audio with independent channels, thereby improving the performance of the Bluetooth device.

In one of the embodiments, the step of preprocessing the first audio data packet to obtain channel-independent frequency domain data includes the following steps:

Analyze the first audio data packet to obtain the audio frame header and intra-frame data;

CRC check is performed on the audio frame header. If the check is passed, bit stream allocation, inverse quantization and stereo processing are performed on the data in the frame to obtain frequency domain data.

In one of the embodiments, the step of performing CRC check on the audio frame header includes the following steps:

Obtain the target information in the audio frame header, the target information includes channel mode, sampling rate, code rate, block mode, bit stream allocation mode, subband mode, scaling factor and the first CRC check value;

Obtain the second CRC check value according to the channel mode, sampling rate, code rate, block mode, bit stream allocation mode, sub-band mode and scaling factor. If the first CRC check value is consistent with the second CRC check value, determine CRC check passed.

In one of the embodiments, the frequency domain data of different channels are respectively compressed and encoded, and the step of acquiring the second audio data packet of the corresponding channel includes the following steps:

Perform bit stream allocation, quantization and main data encapsulation on the frequency domain data of any channel according to the encoding parameters, to obtain the encoded data of the independent channel;

The encoded data of the independent channel is encapsulated to obtain a second audio data packet.

In one of the embodiments, the step of encapsulating the encoded data of the independent channels includes the following steps:

Obtain audio attribute information according to the encoded data, obtain a third CRC check value according to the audio attribute information, use the audio attribute information and the third CRC check value as packet header information, use the encoded data as main data in the packet, and generate a second audio data packet .

In one of the embodiments, the Bluetooth device audio processing method further includes the following steps:

According to local audio playback requirements, select a fourth audio data packet from each second audio data packet, decode the fourth audio data packet, and obtain the first time-domain PCM data;

Send the first time-domain PCM data to the local DAC device, and play audio synchronously with the Bluetooth slave device, wherein the Bluetooth slave device obtains the third audio data packet from the Bluetooth data packet, decodes the third audio data packet, and obtains The second time domain PCM data is sent to the DAC device of the Bluetooth slave device and audio is played.

An audio processing system for a Bluetooth device, comprising:

an audio preprocessing unit, configured to preprocess the first audio data packet to obtain channel-independent frequency domain data when receiving the first audio data packet to be played;

an audio coding unit, configured to compress and encode the frequency domain data of different channels respectively, and obtain the second audio data packet of the corresponding channel;

The audio distribution unit is used to select the third audio data packet from each second audio data packet according to the audio playback requirement of the Bluetooth slave device, wherein the third audio data packet corresponds to the channel in the audio playback requirement;

The audio transmission unit is used to encapsulate the third audio data packet into the Bluetooth data packet, and transmit the Bluetooth data packet to the Bluetooth slave device.

According to the above-mentioned audio processing system for Bluetooth devices, when the audio preprocessing unit receives the first audio data packet to be played, it preprocesses it to obtain channel-independent frequency domain data. The data is respectively compressed and encoded to obtain the corresponding second audio data packet, the audio distribution unit selects the third audio data packet of the corresponding channel from the second audio data packet according to the audio playback requirements of the Bluetooth slave device, and the audio transmission unit will The third audio data packet is encapsulated into a bluetooth data packet, and the bluetooth data packet is transmitted to the bluetooth slave device, and the bluetooth slave device can play the audio of the corresponding channel; the above system can be applied to the bluetooth host device to compress the audio data Encoding, transmits the audio data packets of the corresponding channel according to the audio playback requirements of the Bluetooth slave device, which can greatly reduce the amount of audio data transmission, reduce the corresponding buffer space, and maintain the audio when the Bluetooth slave device plays independent audio channels. sound quality, thereby improving the performance of your Bluetooth device.

A readable storage medium, on which an executable program is stored, when the executable program is executed by a processor, implements the steps of the above-mentioned Bluetooth device audio processing method.

The above-mentioned readable storage medium, through the executable program stored therein, realizes the compression and coding of audio data, and transmits the audio data packets of the corresponding channel according to the audio playback requirements of the Bluetooth slave device, which can greatly reduce the amount of audio data transmission, The corresponding buffer space is reduced, and the audio quality is maintained when the Bluetooth slave device plays audio, thereby improving the performance of the Bluetooth device.

A Bluetooth host device includes a memory and a processor, the memory stores an executable program, and the processor implements the steps of the above Bluetooth device audio processing method when the executable program is executed.

The above-mentioned Bluetooth host device, by running an executable program on the processor, realizes the compression and encoding of audio data, and transmits the audio data packets of the corresponding channel according to the audio playback requirements of the Bluetooth slave device, which can greatly reduce the amount of audio data transmission. , reduce the corresponding buffer space, and maintain the audio quality when the Bluetooth slave device plays audio, thereby improving the performance of the Bluetooth device.

A Bluetooth device audio processing method, comprising the following steps:

Receive the above-mentioned Bluetooth data packet from the Bluetooth host device, and obtain the third audio data packet from the Bluetooth data packet;

Analyze the third audio data packet to obtain packet header information and data in the packet;

Verify the packet header information, and if the verification passes, parse the data in the packet to obtain the target frequency domain data;

Convert the target frequency domain data into second time domain PCM data, send the second time domain PCM data to the local DAC device, and play audio synchronously with the Bluetooth host device, wherein the Bluetooth host device according to audio playback requirements from each second audio data The fourth audio data packet is selected from the packet, the fourth audio data packet is decoded, the first time domain PCM data is obtained, the first time domain PCM data is sent to the DAC device of the Bluetooth host device, and the audio is played.

According to the above-mentioned Bluetooth device audio processing method, the Bluetooth data packet in the above method is received from the Bluetooth host device, a third audio data packet is obtained therefrom, a checksum is performed on it, and the target frequency domain data is obtained and converted into a second audio data packet. domain PCM data, the second time domain PCM data is played by the local DAC device, and at the same time, the Bluetooth host device selects the fourth audio data packet according to the audio playback requirements, decodes it, obtains the first time domain PCM data, and sends it to the Bluetooth host device. The DAC device plays the first time-domain PCM data, and the local DAC device plays audio synchronously with the DAC device of the Bluetooth host device; the above method can be applied to the Bluetooth slave device, and the Bluetooth slave device receives the Bluetooth containing the independent channel audio data packets. Data, independent channel audio data packets are compressed and encoded data, the amount of audio data is small, which can greatly reduce the amount of audio data transmission, reduce the corresponding buffer space, and maintain the audio quality when the Bluetooth slave device plays audio with independent channels, Thereby improving the performance of the Bluetooth device.

An audio processing system for a Bluetooth device, comprising:

an audio receiving unit, configured to receive the above-mentioned Bluetooth data packet from the Bluetooth host device, and obtain a third audio data packet from the Bluetooth data packet;

a verification parsing unit, configured to parse the third audio data packet to obtain packet header information and data in the packet; verify the packet header information, and if the verification passes, parse the data in the packet to obtain target frequency domain data;

The conversion and transmission unit is used to convert the target frequency domain data into the second time domain PCM data, send the second time domain PCM data to the local DAC device, and play audio synchronously with the Bluetooth host device, wherein the Bluetooth host device is based on audio playback requirements. Select the fourth audio data packet from each second audio data packet, decode the fourth audio data packet, obtain the first time domain PCM data, send the first time domain PCM data to the DAC device of the Bluetooth host device and play the audio .

A readable storage medium, on which an executable program is stored, when the executable program is executed by a processor, implements the steps of the above-mentioned Bluetooth device audio processing method.

The above-mentioned readable storage medium, through the executable program stored therein, realizes receiving Bluetooth data including independent channel audio data packets, independent channel audio data packets are compressed encoded data, and the audio data volume is small, which can greatly reduce the transmission of audio data. The corresponding buffer space is reduced, and the audio quality is maintained when the Bluetooth slave device plays audio with independent channels, thereby improving the performance of the Bluetooth device.

A Bluetooth slave device includes a memory and a processor, the memory stores an executable program, and the processor implements the steps of the audio processing method for a Bluetooth device when the executable program is executed.

The above-mentioned Bluetooth slave device, by running an executable program on the processor, realizes receiving Bluetooth data including independent channel audio data packets. The independent channel audio data packets are compressed and encoded data, and the amount of audio data is small, which can greatly reduce the audio frequency. The data transmission volume reduces the corresponding buffer space, and at the same time maintains the audio quality when the Bluetooth slave device plays audio with independent channels, thereby improving the performance of the Bluetooth device.

A Bluetooth device, including a Bluetooth host device and a Bluetooth slave device;

When the Bluetooth host device receives the first audio data packet to be played, it preprocesses the first audio data packet to obtain channel-independent frequency domain data; compresses and encodes the frequency domain data of different channels to obtain the corresponding frequency domain data. The second audio data packet of the channel; according to the audio playback requirements of the Bluetooth slave device, a third audio data packet is selected from each second audio data packet, wherein the third audio data packet is the same as the channel in the audio playback requirements. Corresponding; encapsulate the third audio data packet into the Bluetooth data packet, and transmit the Bluetooth data packet to the Bluetooth slave device;

The Bluetooth host device selects the fourth audio data packet from the second audio data packets according to the audio playback requirements, decodes the fourth audio data packet, obtains the first time-domain PCM data, and sends the first time-domain PCM data to the Bluetooth host. device's DAC unit.

The Bluetooth slave device obtains the third audio data packet from the received Bluetooth data packet; parses the third audio data packet to obtain the packet header information and the data in the packet; verifies the packet header information, if the verification passes, the packet Analyze the internal data to obtain the target frequency domain data; convert the target frequency domain data into the second time domain PCM data, send the second time domain PCM data to the DAC device of the Bluetooth slave device, and synchronize with the DAC device of the Bluetooth host device Play audio.

Description of drawings

1 is an application scenario diagram of a Bluetooth device audio processing method in one embodiment;

Fig. 2 is a schematic flowchart of a method for audio processing of a Bluetooth device in one embodiment;

3 is a schematic structural diagram of a Bluetooth device audio processing system in one embodiment;

4 is a schematic structural diagram of a Bluetooth device audio processing system in another embodiment;

5 is a schematic flowchart of a Bluetooth device audio processing method in another embodiment;

6 is a schematic structural diagram of a Bluetooth device audio processing system in another embodiment;

7 is a schematic diagram of the relationship of a Bluetooth device in one embodiment;

8 is a schematic flow chart of a Bluetooth host device processing an audio data packet in one embodiment;

9 is a schematic flowchart of a Bluetooth host device processing frequency domain data in one embodiment;

FIG. 10 is a schematic diagram of an audio data packet encapsulation format in one embodiment.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and do not limit the protection scope of the present invention.

It should be noted that the term "first\second\third" involved in the embodiments of the present invention is only to distinguish similar objects, and does not represent a specific ordering of objects. It is understandable that "first\second\" "Third" may interchange a specific order or sequence where permitted. It should be understood that the "first\second\third" distinctions may be interchanged under appropriate circumstances to enable the embodiments of the invention described herein to be practiced in sequences other than those illustrated or described herein.

The audio processing method for a Bluetooth device provided in this application can be applied to the application environment shown in FIG. 1 . Among them, the Bluetooth host device communicates with the Bluetooth slave device. When the Bluetooth host device receives the audio data packet to be played, it processes the audio data packet, selects the audio data packet of the corresponding channel according to the audio playback requirements of the Bluetooth slave device, encapsulates it into the Bluetooth data packet and transmits it. To the Bluetooth slave device, the Bluetooth slave device extracts the audio data in the Bluetooth data packet, processes and plays it. Among them, both the Bluetooth host device and the Bluetooth slave device can be various devices with Bluetooth communication and audio playback functions, such as personal computers, notebook computers, PDAs, smart phones, tablet computers, portable wearable devices, Bluetooth speakers, etc. There can be multiple Bluetooth slave devices.

Referring to FIG. 2 , it is a schematic flowchart of an audio processing method for a Bluetooth device according to an embodiment of the present invention. The Bluetooth device audio processing method in this embodiment includes the following steps:

Step S110: when receiving the first audio data packet to be played, preprocessing the first audio data packet to obtain channel-independent frequency domain data;

In this step, the first audio data packet to be played may be audio data received from the outside world, and the first audio data packet may be stored in the local buffer space; the frequency domain data of different channels are different, and the channels are independent The data volume of the frequency domain data is less than the data volume of the original audio data;

Step S120: compressing and encoding the frequency domain data of different channels respectively, and obtaining the second audio data packet of the corresponding channel;

In this step, the frequency-domain data of different channels is the frequency-domain data corresponding to the channel that needs to be played. When performing two-channel playback, there are two-channel frequency-domain data; when performing four-channel playback , there are four channels of frequency domain data;

Step S130: According to the audio playback requirement of the Bluetooth slave device, select a third audio data packet from each second audio data packet, wherein the third audio data packet corresponds to the channel in the audio playback requirement;

In this step, the Bluetooth slave device uses the corresponding channel for audio playback according to the audio playback requirements;

Step S140: Encapsulate the third audio data packet into a Bluetooth data packet, and transmit the Bluetooth data packet to the Bluetooth slave device.

In this step, the third audio data packet is encapsulated in a Bluetooth data packet and transmitted to the Bluetooth slave device in the form of a Bluetooth signal, and the Bluetooth slave device can play the audio data in the third audio data packet.

In this embodiment, when the first audio data packet to be played is received, it is preprocessed to obtain frequency domain data with independent channels, and the frequency domain data of independent channels are respectively compressed and encoded to obtain the corresponding The second audio data packet, according to the audio playback requirements of the Bluetooth slave device, selects the third audio data packet corresponding to the channel from the second audio data packet, encapsulates it into the Bluetooth data packet, and transmits the Bluetooth data packet to the Bluetooth slave device. device, the bluetooth slave device can play the audio of the corresponding channel; the above method can be applied to the bluetooth host device, the bluetooth host device compresses and encodes the audio data, and transmits the audio data of the corresponding channel according to the audio playback requirements of the bluetooth slave device The package can greatly reduce the amount of audio data transmission, reduce the corresponding buffer space, and maintain the audio quality when the Bluetooth slave device plays audio with independent channels, thereby improving the performance of the Bluetooth device.

It should be noted that, before the Bluetooth data packet is transmitted to the Bluetooth slave device, a Bluetooth connection has been established with the Bluetooth slave device, and the received first audio data packet to be played may be the audio from the mobile phone or other audio data sender. data.

In one embodiment, the step of preprocessing the first audio data packet to obtain channel-independent frequency domain data includes the following steps:

Analyze the first audio data packet to obtain the audio frame header and intra-frame data;

CRC check is performed on the audio frame header. If the check is passed, bit stream allocation, inverse quantization and stereo processing are performed on the data in the frame to obtain frequency domain data.

In this embodiment, when the first audio data packet is preprocessed, the audio frame header and intra-frame data are obtained by parsing, and the audio frame header is first subjected to a CRC check (Cyclic Redundancy Check, cyclic redundancy check), and the Whether the frame header information in the first audio data packet is correct, and under the condition that the CRC check is passed, indicates that the data in the first audio data packet is accurate and has not received interference, and the intra-frame data can be subjected to bit stream allocation, inverse quantization and Stereo processing and other operations to obtain the frequency domain data of the corresponding channel; CRC check can ensure the integrity of the received audio data and obtain accurate independent channel frequency domain data.

Further, if the CRC check fails, it indicates that the data of the first audio data packet is incorrect or that the verification process is wrong, and the audio data may not be subjected to follow-up operations, and the first audio data packet may be parsed again, or, the first audio data packet may be sent to the first audio data packet. The terminal of the audio data packet initiates a retransmission request, and re-receives the first audio data packet.

In one embodiment, the step of performing CRC check on the audio frame header includes the following steps:

Obtain the target information in the audio frame header, the target information includes channel mode, sampling rate, code rate, block mode, bit stream allocation mode, subband mode, scaling factor and the first CRC check value;

Obtain the second CRC check value according to the channel mode, sampling rate, code rate, block mode, bit stream allocation mode, sub-band mode and scaling factor. If the first CRC check value is consistent with the second CRC check value, determine CRC check passed.

In this embodiment, the audio frame header is parsed to obtain information such as channel mode, sampling rate, code rate, block mode, bit stream allocation mode, subband mode, scaling factor, and the first CRC check value, etc., The first CRC check value is originally recorded in the audio frame header for verification and comparison, and is calculated by using the above-mentioned information such as channel mode, sampling rate, code rate, block mode, bit stream allocation mode, subband mode, and scaling factor. The second CRC check value is compared with the first CRC check value. If it is consistent, it indicates that the audio information has not changed and the audio data is normal. It can be determined that the CRC check is passed, and the audio attribute information can be used to verify the data transmission. correctness and completeness.

In one embodiment, the frequency domain data of different channels are respectively compressed and encoded, and the step of acquiring the second audio data packet of the corresponding channel includes the following steps:

Perform bit stream allocation, quantization and main data encapsulation on the frequency domain data of any channel according to the encoding parameters, to obtain the encoded data of the independent channel;

The encoded data of the independent channel is encapsulated to obtain a second audio data packet.

In this embodiment, different coding methods have different processing procedures for frequency domain data. The frequency domain data can be processed with reference to coding parameters, and the coded data of independent channels can be obtained through bit stream allocation, quantization and main data encapsulation. The second audio data packet is obtained, and the encoding of the frequency domain data of the independent channel can be completed by the above method, and the second audio data packet is corresponding to the channel.

In one embodiment, the step of encapsulating the encoded data of the independent channels includes the following steps:

Obtain audio attribute information according to the encoded data, obtain a third CRC check value according to the audio attribute information, use the audio attribute information and the third CRC check value as packet header information, use the encoded data as main data in the packet, and generate a second audio data packet .

In this embodiment, when generating the second audio data packet, necessary header information needs to be added to the data packet, the packet header information mainly includes audio attribute information, and the third CRC check value can be obtained by using the audio attribute information, and It is attached to the packet header information for checking the second audio data packet to ensure that the second audio data packet can be received completely and correctly.

Further, the audio attribute information may include packet synchronization word, audio basic information, energy level, packet number information, frame number information in the packet, etc. The frame number information in the packet corresponds to the frame number of the encoded data in the second audio data packet, and the audio The basic information includes code rate information. The code rate in the same audio data packet is fixed, and the code rate in different audio data packets is variable. Different audio data packets can contain different frame numbers, which are indicated by the frame number information in the packet header information. It should be noted that the second audio data packet corresponds to a channel, and there may be multiple second audio data packets corresponding to an independent channel.

Further, the length of a compressed frame of data can be calculated according to the number of points and the sampling rate of each frame in the audio data packet, and byte alignment processing is performed on each frame of compressed data to save data capacity.

In one embodiment, the Bluetooth device audio processing method further includes the following steps:

According to local audio playback requirements, select a fourth audio data packet from each second audio data packet, decode the fourth audio data packet, and obtain the first time-domain PCM data;

Send the first time-domain PCM data to the local DAC device, and play audio synchronously with the Bluetooth slave device, wherein the Bluetooth slave device obtains the third audio data packet from the Bluetooth data packet, decodes the third audio data packet, and obtains The second time domain PCM data is sent to the DAC device of the Bluetooth slave device and audio is played.

In this embodiment, the fourth audio data packet can be selected locally according to the playback requirements, and decoded to obtain the first time-domain PCM (Pulse Code Modulation, pulse code modulation) data, and sent to the local DAC (Digital toanalog converter) , digital-to-analog conversion) device, the DAC device can directly play the decoded time-domain PCM data; after the Bluetooth slave device obtains the third audio data packet, it decodes to obtain the second time-domain PCM data, and sends it to the DAC of the Bluetooth slave device The device plays audio synchronously with the local DAC device to realize the audio stereo listening effect.

According to the above-mentioned Bluetooth device audio processing method, an embodiment of the present invention further provides a Bluetooth device audio processing system, and the embodiments of the Bluetooth device audio processing system of the present invention are described in detail below.

Referring to FIG. 3 , it is a schematic structural diagram of an audio processing system for a Bluetooth device according to an embodiment of the present invention. The Bluetooth device audio processing system in this embodiment includes:

The audio preprocessing unit 210 is configured to preprocess the first audio data packet to obtain channel-independent frequency domain data when receiving the first audio data packet to be played;

The audio coding unit 220 is used to compress and encode the frequency domain data of different channels respectively, and obtain the second audio data packet of the corresponding channel;

The audio distribution unit 230 is used to select the third audio data packet from each second audio data packet according to the audio playback requirement of the Bluetooth slave device, wherein the third audio data packet corresponds to the channel in the audio playback requirement;

The audio transmission unit 240 is configured to encapsulate the third audio data packet into the Bluetooth data packet, and transmit the Bluetooth data packet to the Bluetooth slave device.

In this embodiment, the audio preprocessing unit preprocesses the to-be-played first audio data packet to obtain channel-independent frequency-domain data, and the audio coding unit separately processes the frequency-domain data of the independent channel Compression coding is performed to obtain the corresponding second audio data packet, the audio distribution unit selects the third audio data packet of the corresponding channel from the second audio data packet according to the audio playback requirements of the Bluetooth slave device, and the audio transmission unit transfers the third audio data packet. The audio data packet is encapsulated into a Bluetooth data packet, and the Bluetooth data packet is transmitted to the Bluetooth slave device, and the Bluetooth slave device can play the audio of the corresponding channel; the above system can be applied to the Bluetooth host device to compress and encode the audio data, According to the audio playback requirements of the Bluetooth slave device, the audio data packets of the corresponding channel can be transmitted, which can greatly reduce the amount of audio data transmission, reduce the corresponding buffer space, and maintain the audio quality when the Bluetooth slave device plays independent audio channels. Thereby improving the performance of the Bluetooth device.

In one embodiment, the audio preprocessing unit 210 parses the first audio data packet to obtain an audio frame header and intra-frame data; performs CRC check on the audio frame header, and if the check is passed, performs a bit stream on the intra-frame data Distribution, inverse quantization and stereo processing to obtain frequency domain data.

In one embodiment, the audio preprocessing unit 210 obtains target information in the audio frame header, and the target information includes channel mode, sampling rate, code rate, block mode, bit stream allocation mode, subband mode, scaling factor and A CRC check value; obtain the second CRC check value according to the channel mode, sampling rate, code rate, block mode, bit stream allocation mode, subband mode and scaling factor, if the first CRC check value and the second CRC check value are If the check value is consistent, it is determined that the CRC check is passed.

In one of the embodiments, the audio coding unit 220 performs bit stream allocation, quantization and main data encapsulation on the frequency domain data of any channel according to the coding parameters to obtain the coded data of the independent channel; encapsulate to obtain a second audio data packet.

In one embodiment, the audio encoding unit 220 obtains audio attribute information according to the encoded data, obtains a third CRC check value according to the audio attribute information, uses the audio attribute information and the third CRC check value as packet header information, and uses the encoded data as The main data in the package generates the second audio data package.

In one of the embodiments, as shown in FIG. 4 , the audio processing system for the Bluetooth device further includes an audio conversion unit 250;

The audio conversion unit 250 is used to select a fourth audio data packet from each second audio data packet according to local audio playback requirements, decode the fourth audio data packet, and obtain the first time domain PCM data; The PCM data is sent to the local DAC device, and the audio is played synchronously with the Bluetooth slave device; wherein, the Bluetooth slave device obtains the third audio data packet from the Bluetooth data packet, decodes the third audio data packet, and obtains the second time domain PCM. data, send the second time-domain PCM data to the DAC device of the Bluetooth slave device and play audio.

The Bluetooth device audio processing system of the present invention corresponds to the Bluetooth device audio processing method of the present invention, and the technical features and beneficial effects described in the above embodiments of the Bluetooth device audio processing method are all applicable to the embodiments of the Bluetooth device audio processing system middle.

According to the above-mentioned audio processing method for a Bluetooth device, an embodiment of the present invention further provides a readable storage medium and a Bluetooth host device.

A readable storage medium on which an executable program is stored, and when the executable program is executed by a processor, implements the steps of the above-mentioned audio processing method for a Bluetooth device.

The above-mentioned readable storage medium, through the executable program stored therein, realizes the compression and coding of audio data, and transmits the audio data packets of the corresponding channel according to the audio playback requirements of the Bluetooth slave device, which can greatly reduce the amount of audio data transmission, The corresponding buffer space is reduced, and the audio quality is maintained when the Bluetooth slave device plays audio, thereby improving the performance of the Bluetooth device.

A Bluetooth host device includes a memory and a processor, the memory stores an executable program, and the processor implements the steps of the above Bluetooth device audio processing method when the executable program is executed.

The above-mentioned Bluetooth host device, by running an executable program on the processor, realizes the compression and encoding of audio data, and transmits the audio data packets of the corresponding channel according to the audio playback requirements of the Bluetooth slave device, which can greatly reduce the amount of audio data transmission. , reduce the corresponding buffer space, and maintain the audio quality when the Bluetooth slave device plays audio, thereby improving the performance of the Bluetooth device.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium, In an embodiment, the program may be stored in a storage medium of a computer system and executed by at least one processor in the computer system to implement the process including the above-mentioned embodiment of the audio processing method for a Bluetooth device. The storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM) or the like.

According to the above-mentioned Bluetooth device audio processing method, the embodiment of the present invention further provides another Bluetooth device audio processing method, and an embodiment of another Bluetooth device audio processing method of the present invention will be described in detail below.

Referring to FIG. 5, it is a schematic flowchart of an audio processing method for a Bluetooth device according to an embodiment of the present invention. The Bluetooth device audio processing method in this embodiment includes the following steps:

Step S310: Receive the above-mentioned Bluetooth data packet from the Bluetooth host device, and obtain a third audio data packet from the Bluetooth data packet;

Step S320: parse the third audio data packet to obtain packet header information and data in the packet;

Step S330: Verify the packet header information, and if the verification passes, parse the data in the packet to obtain target frequency domain data;

Step S340: Convert the target frequency domain data into the second time domain PCM data, send the second time domain PCM data to the local DAC device, and play audio synchronously with the Bluetooth host device, wherein the Bluetooth host device according to the audio playback requirements The fourth audio data packet is selected from the two audio data packets, the fourth audio data packet is decoded, the first time domain PCM data is obtained, the first time domain PCM data is sent to the DAC device of the Bluetooth host device, and the audio is played.

In this embodiment, the Bluetooth data packet in the above method is received from a Bluetooth host device, a third audio data packet is obtained therefrom, a checksum is performed on it, and target frequency domain data is obtained and converted into second time domain PCM data, The second time-domain PCM data is played by the local DAC device, and at the same time, the Bluetooth host device selects the fourth audio data packet according to the audio playback requirements, decodes it, obtains the first time-domain PCM data, and plays it by the DAC device of the Bluetooth host device In the first time-domain PCM data, the local DAC device and the DAC device of the Bluetooth host device play audio synchronously; the above method can be applied to the Bluetooth slave device, and the Bluetooth slave device receives the Bluetooth data including the independent channel audio data packets, and the independent audio The audio data packets are compressed and encoded data, and the audio data volume is small, which can greatly reduce the amount of audio data transmission, reduce the corresponding buffer space, and maintain the audio quality when the Bluetooth slave device plays audio with independent channels, thereby improving the Bluetooth device. performance.

Further, when analyzing the third audio data packet, the synchronization word in the third audio data packet may be checked first, thereby determining the position of the packet header, and obtaining the packet header information and the data in the packet.

It should be noted that, when analyzing the data in the packet, the audio data compressed by several frames in the packet is processed by bit stream allocation, inverse quantization, etc., to obtain frequency domain data.

In one embodiment, the step of verifying the packet header information includes the following steps:

The packet number information is obtained from the packet header information, and when the packet number information is not continuous with the packet number information of the last third audio data packet, a retransmission request or a packet supplement request is initiated to the Bluetooth host device according to audio playback requirements.

In this embodiment, the packet number information is information used to indicate the sequence of the third audio data packet, using the packet number information in the current third audio data packet and the packet number information in the received last third audio data packet, Determine whether the two are continuous. If so, it indicates that the received third audio data packet is not interrupted; otherwise, it indicates that the third audio data packet is lost. You can send a retransmission request or a supplementary packet request to the Bluetooth host device to ensure that The integrity of the third audio data packet, the retransmission request or the supplementary packet request can be selected according to the actual audio playback requirements to meet application needs.

In one embodiment, the step of verifying the packet header information includes the following steps:

Obtain the third CRC check value in the packet header information, and obtain the fourth CRC check value according to other information in the packet header information except the third CRC check value;

If the third CRC check value is consistent with the fourth CRC check value, it is determined that the check is passed.

In this embodiment, the packet header information includes the third CRC check value and the attribute information of the audio data, the fourth CRC check value is calculated by using the audio attribute information, and compared with the third CRC check value, if they are consistent, it indicates that the audio If the information has not changed and the audio data is normal, it can be determined that the CRC check is passed, and the correctness and integrity of the data transmission can be ensured by using the audio attribute information to check.

It should be noted that, the verification process of the packet header information may adopt CRC verification, or may adopt other forms of data verification methods.

According to the above-mentioned Bluetooth device audio processing method, an embodiment of the present invention further provides a Bluetooth device audio processing system, and the embodiments of the Bluetooth device audio processing system of the present invention are described in detail below.

Referring to FIG. 6, it is a schematic structural diagram of an audio processing system for a Bluetooth device according to an embodiment of the present invention. The Bluetooth device audio processing system in this embodiment includes:

The audio receiving unit 410 is configured to receive the above-mentioned Bluetooth data packet from the Bluetooth host device, and obtain the third audio data packet from the Bluetooth data packet;

The verification parsing unit 420 is used to parse the third audio data packet to obtain packet header information and data in the packet; verify the packet header information, and if the verification passes, parse the data in the packet to obtain target frequency domain data;

The conversion and transmission unit 430 is used to convert the target frequency domain data into second time domain PCM data, send the second time domain PCM data to the local DAC device, and play audio synchronously with the Bluetooth host device, wherein the Bluetooth host device plays the audio according to the It is required to select a fourth audio data packet from each second audio data packet, decode the fourth audio data packet, obtain the first time-domain PCM data, and send the first time-domain PCM data to the DAC device of the Bluetooth host device and play audio.

In this embodiment, the audio receiving unit 410 receives the Bluetooth data packet in the above method from the Bluetooth host device, obtains the third audio data packet therefrom, and the verification and parsing unit 420 checks and parses it to obtain the target frequency domain data, The conversion and transmission unit 430 converts it into the second time domain PCM data, and the second time domain PCM data is played by the local DAC device. Meanwhile, the Bluetooth host device selects the fourth audio data packet according to the audio playback requirements, decodes it, and obtains the first One time domain PCM data, and the first time domain PCM data is played by the DAC device of the Bluetooth host device, and the local DAC device and the DAC device of the Bluetooth host device play audio synchronously; the above system can be applied to the Bluetooth slave device, the Bluetooth slave device The device receives Bluetooth data including independent channel audio data packets. The independent channel audio data packets are compressed and encoded data, and the amount of audio data is small, which can greatly reduce the amount of audio data transmission and reduce the corresponding buffer space. Improves the performance of Bluetooth devices by maintaining audio quality when playing channel-independent audio.

In one embodiment, the verification and parsing unit 420 obtains the packet number information from the packet header information, and when the packet number information is not continuous with the packet number information of the last third audio data packet, initiates a replay to the Bluetooth host device according to the audio playback requirement. Send a request or a supplementary request.

The Bluetooth device audio processing system of the present invention corresponds to the Bluetooth device audio processing method of the present invention, and the technical features and beneficial effects described in the above embodiments of the Bluetooth device audio processing method are all applicable to the embodiments of the Bluetooth device audio processing system middle.

According to the above-mentioned audio processing method for a Bluetooth device, an embodiment of the present invention further provides a readable storage medium and a Bluetooth slave device.

A readable storage medium on which an executable program is stored, and when the executable program is executed by a processor, implements the steps of the above-mentioned audio processing method for a Bluetooth device.

The above-mentioned readable storage medium, through the executable program stored therein, realizes receiving Bluetooth data including independent channel audio data packets, independent channel audio data packets are compressed encoded data, and the audio data volume is small, which can greatly reduce the transmission of audio data. The corresponding buffer space is reduced, and the audio quality is maintained when the Bluetooth slave device plays audio with independent channels, thereby improving the performance of the Bluetooth device.

A Bluetooth slave device includes a memory and a processor, the memory stores an executable program, and the processor implements the steps of the audio processing method for a Bluetooth device when the executable program is executed.

The above-mentioned Bluetooth slave device, by running an executable program on the processor, realizes receiving Bluetooth data including independent channel audio data packets. The independent channel audio data packets are compressed and encoded data, and the amount of audio data is small, which can greatly reduce the audio frequency. The data transmission volume reduces the corresponding buffer space, and at the same time maintains the audio quality when the Bluetooth slave device plays audio with independent channels, thereby improving the performance of the Bluetooth device.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium, In an embodiment, the program can be stored in a storage medium of a computer system and executed by at least one processor in the computer system to implement the process including the above-mentioned embodiments of the Bluetooth device audio processing method. The storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), or a random access memory (Random Access Memory, RAM) or the like.

According to the above-mentioned audio processing method of a Bluetooth device, an embodiment of the present invention further provides a Bluetooth device, and an embodiment of a Bluetooth device of the present invention will be described in detail below.

Referring to FIG. 7, it is a schematic structural diagram of a Bluetooth device according to an embodiment of the present invention. The Bluetooth device in this embodiment includes a Bluetooth host device 510 and a Bluetooth slave device 520;

When receiving the first audio data packet to be played, the Bluetooth host device 510 preprocesses the first audio data packet to obtain channel-independent frequency domain data; compresses and encodes the frequency domain data of different channels to obtain The second audio data packet of the corresponding channel; according to the audio playback requirements of the Bluetooth slave device 520, a third audio data packet is selected from each second audio data packet, wherein the third audio data packet and the audio in the audio playback requirements are selected. corresponding to the channel; encapsulate the third audio data packet into a Bluetooth data packet, and transmit the Bluetooth data packet to the Bluetooth slave device 520;

The Bluetooth host device 510 selects a fourth audio data packet from each second audio data packet according to the audio playback requirement, decodes the fourth audio data packet, obtains the first time-domain PCM data, and sends the first time-domain PCM data to the Bluetooth The DAC device of the host device 510 .

The Bluetooth slave device 520 obtains the third audio data packet from the received Bluetooth data packet; parses the third audio data packet to obtain the packet header information and the data in the packet; The data in the packet is analyzed to obtain the target frequency domain data; the target frequency domain data is converted into the second time domain PCM data, and the second time domain PCM data is sent to the DAC device of the Bluetooth slave device 520, and the Bluetooth host device 510. The DAC unit plays the audio synchronously.

In this embodiment, when receiving the first audio data packet to be played, the Bluetooth host device 510 preprocesses it to obtain frequency-domain data with independent channels, and compresses and encodes the frequency-domain data of the independent channels respectively. , obtain the corresponding second audio data packet, according to the audio playback requirements of the Bluetooth slave device 520, select the third audio data packet of the corresponding channel from the second audio data packet, encapsulate it into the Bluetooth data packet, and the Bluetooth data packet It is transmitted to the bluetooth slave device 520, and the bluetooth slave device 520 obtains the third audio data packet from the bluetooth data packet, performs checksum analysis on it, obtains the target frequency domain data and converts it into the second time domain PCM data. The DAC device plays the second time-domain PCM data, and at the same time, the Bluetooth host device 510 selects the fourth audio data packet according to the audio playback requirements, decodes it, obtains the first time-domain PCM data, and is played by the DAC device of the Bluetooth host device 510 In the first time-domain PCM data, the local DAC device and the DAC device of the Bluetooth host device 510 play audio synchronously; Audio playback ensures audio quality and sound effects, and the amount of independent audio data transmitted through compressed and encoded channels is smaller than that of general audio data. Reducing the amount of audio data transmission can effectively reduce the corresponding cache space, thereby improving the performance of Bluetooth devices. .

Further, the Bluetooth host device 510 can access the public network, such as the Internet network, etc. through wired or wireless means, communicate with other terminals or servers, receive and cache audio data, and send the Bluetooth slave device to the Bluetooth slave device after sorting out the audio data packets. 520 to send.

In one embodiment, the audio processing method of a Bluetooth device can be applied to a Bluetooth pairing box.

The Bluetooth pairing box includes a Bluetooth host device and a Bluetooth slave device, and there can be multiple Bluetooth slave devices.

The audio data packets in the advanced audio SBC (Sub Band Code, sub-band coding) format received by the Bluetooth host device are preprocessed by frame, as shown in Figure 8, mainly including audio frame header information analysis, including channel mode, sampling rate, code rate, block mode, bit stream allocation mode, subband mode, SBC scaling factor information and CRC check value C0, and then perform CRC check, that is, calculate channel mode, sampling rate, code rate, block mode, bit The CRC of important information such as stream allocation mode, subband mode, and SBC scaling factor information obtains C1, and compares whether C0 and C1 are consistent. If it is inconsistent, find the synchronization header in the audio data packet to parse the audio frame header information again. If it is consistent, then analyze the bit stream allocation scheme, inverse quantize the frequency domain data, and perform stereo processing to obtain channel-independent frequency domain data.

The frequency domain data is compressed and encoded according to different channels. As shown in Figure 9, it mainly includes bit stream allocation, quantization, and main data encapsulation of frequency domain data according to coding parameters, and then through audio data packet encapsulation, according to the format shown in Figure 10, plus packet synchronization word, audio basic information, energy Level, packet number information, frame number information in the packet, and perform CRC check on the important information of the packet header, attach the CRC check value to it, and add the encoded main frame number corresponding to the frame number information in the packet. data to form channel-independent audio packets. If it is two channels, it forms two independent audio data streams, if it is four channels, it forms four independent audio data streams, and if it is more channels, it forms a corresponding number of independent audio data streams. Then calculate the length of the compressed data according to the number of points and sampling rate of each frame, and perform byte alignment processing on each frame of compressed data. The basic audio information includes the bit rate information, and the bit rate in the same audio data packet is fixed. , the bit rate of different audio packets is variable. Different audio data packets may contain different frame numbers, which are indicated by the variable frame number information in the packet header.

The Bluetooth host device encapsulates the audio data packet of a selected channel into a Bluetooth data packet according to the playback requirements of the Bluetooth slave device, and transmits it to a Bluetooth slave device. The Bluetooth slave device parses the corresponding audio data packet, checks the synchronization word to determine the position of the packet header, and parses out the basic audio information, energy level, packet number information, frame number information in the packet, and CRC check value. By comparing whether the calculated CRC value is consistent with the CRC value of the packet header information or other data verification methods, determine whether the important information of the packet header is correct, whether the packet number information is continuous with the previous packet, and determine whether the audio data transmitted by Bluetooth has lost packets. The application requirements are determined to require retransmission or supplementary packages. The Bluetooth slave device performs the decoding process corresponding to the compression encoding, and processes the compressed audio data stream of several frames in the packet through bit stream allocation, inverse quantization, etc. to obtain frequency domain data, and finally passes through the SBC sub-band synthesis filter bank to decode as Time-domain PCM data that can be played directly is pushed to the DAC.

On the other hand, the Bluetooth host device also selects an audio data packet of a channel according to the playback requirements, directly performs the decoding process, obtains time domain data, and plays synchronously with the Bluetooth slave device.

In this way, while maintaining the high quality of advanced audio, frequency domain compression can be performed on the audio of the independent channel that needs to be forwarded according to the playback requirements, which greatly reduces the amount of audio data transmission on the basis of adding a small number of operations, and can reduce the corresponding cache. space to improve Bluetooth performance.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

Those skilled in the art can understand that all or part of the steps in the method of the above embodiments can be implemented by instructing the relevant hardware through a program. The program can be stored in a computer-readable storage medium. When the program is executed, the steps described in the above method are included. The storage medium includes: ROM/RAM, magnetic disk, optical disk and so on.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims (12)

1. a Bluetooth device audio processing method, is characterized in that, comprises the following steps: When receiving the first audio data packet to be played, preprocessing the first audio data packet to obtain channel-independent frequency domain data; Compressing and encoding the frequency domain data of different channels respectively to obtain the second audio data packet of the corresponding channel; According to the audio playback requirement of the Bluetooth slave device, a third audio data packet is selected from each of the second audio data packets, wherein the third audio data packet corresponds to the channel in the audio playback requirement; The third audio data packet is encapsulated into a Bluetooth data packet, and the Bluetooth data packet is transmitted to the Bluetooth slave device. 2. The Bluetooth device audio processing method according to claim 1, wherein the step of preprocessing the first audio data packet to obtain channel-independent frequency domain data comprises the following steps: The first audio data packet is analyzed to obtain audio frame header and intra-frame data; CRC check is performed on the audio frame header, and if the check is passed, bit stream allocation, inverse quantization and stereo processing are performed on the data in the frame to obtain the frequency domain data. 3. The bluetooth device audio processing method according to claim 2, wherein the step of carrying out a CRC check to the audio frame header comprises the following steps: Acquiring target information in the audio frame header, the target information includes channel mode, sampling rate, code rate, block mode, bit stream allocation mode, subband mode, scaling factor and a first CRC check value; A second CRC check value is obtained according to the channel mode, sampling rate, code rate, block mode, bit stream allocation mode, subband mode and scaling factor, if the first CRC check value is the same as the second CRC check value If the check value is consistent, it is determined that the CRC check is passed. 4. The bluetooth device audio processing method according to claim 1, wherein the frequency domain data of different channels are respectively compressed and encoded, and the step of acquiring the second audio data packet of the corresponding channel comprises the following steps: Perform bit stream allocation, quantization and main data encapsulation on the frequency domain data of any channel according to the encoding parameters, to obtain the encoded data of the independent channel; The encoded data of the independent channel is encapsulated to obtain the second audio data packet. 5. The Bluetooth device audio processing method according to claim 4, wherein the step of encapsulating the encoded data of the independent channel comprises the following steps: Acquire audio attribute information according to the encoded data, obtain a third CRC check value according to the audio attribute information, use the audio attribute information and the third CRC check value as packet header information, and use the encoded data as a packet inner main data to generate the second audio data packet. 6. The Bluetooth device audio processing method according to claim 1, further comprising the steps of: According to local audio playback requirements, select a fourth audio data packet from each of the second audio data packets, decode the fourth audio data packet, and obtain the first time-domain PCM data; sending the first time-domain PCM data to the local DAC device, and playing audio synchronously with the Bluetooth slave device, wherein the Bluetooth slave device obtains the third audio data packet from the Bluetooth data packet, Decode the third audio data packet, obtain second time-domain PCM data, send the second time-domain PCM data to the DAC device of the Bluetooth slave device, and play audio. 7. A Bluetooth device audio processing method, characterized in that, comprising the following steps: Receive the Bluetooth data packet according to any one of claims 1 to 6 from a Bluetooth host device, and obtain the third audio data packet from the Bluetooth data packet; The third audio data packet is analyzed to obtain packet header information and data in the packet; Verifying the packet header information, and if the verification passes, parsing the data in the packet to obtain target frequency domain data; Convert the target frequency domain data into second time domain PCM data, send the second time domain PCM data to the local DAC device, and play audio synchronously with the Bluetooth host device, wherein the Bluetooth host device The playback requirement selects a fourth audio data packet from each of the second audio data packets, decodes the fourth audio data packet, obtains first time-domain PCM data, and sends the first time-domain PCM data to Bluetooth DAC device of the host device and play audio; The step of verifying the packet header information includes the following steps: Obtain the packet number information from the packet header information, and when the packet number information is not continuous with the packet number information of the previous third audio data packet, initiate a retransmission request or supplementary packet to the Bluetooth host device according to audio playback requirements ask. 8. A Bluetooth device audio processing system, characterized in that, comprising: an audio preprocessing unit, configured to preprocess the first audio data packet to obtain channel-independent frequency domain data when receiving the first audio data packet to be played; an audio coding unit, configured to compress and encode the frequency domain data of different channels respectively, and obtain the second audio data packet of the corresponding channel; The audio distribution unit is used to select a third audio data packet from each of the second audio data packets according to the audio playback requirements of the Bluetooth slave device, wherein the third audio data packet and the audio playback requirements Corresponding to the channel; An audio transmission unit, configured to encapsulate the third audio data packet into a Bluetooth data packet, and transmit the Bluetooth data packet to the Bluetooth slave device. 9. A Bluetooth host device, comprising a memory and a processor, wherein the memory stores an executable program, wherein the processor implements the execution of any one of claims 1 to 6 when the executable program is executed. The steps of the Bluetooth device audio processing method. 10. A Bluetooth device audio processing system, comprising: an audio receiving unit, configured to receive the Bluetooth data packet according to claim 9 from a Bluetooth host device, and obtain the third audio data packet from the Bluetooth data packet; a verification parsing unit, configured to parse the third audio data packet to obtain packet header information and data in the packet; verify the packet header information, and if the verification passes, parse the data in the packet to obtain target frequency domain data; A conversion and transmission unit, configured to convert the target frequency domain data into second time domain PCM data, send the second time domain PCM data to a local DAC device, and play audio synchronously with the Bluetooth host device, wherein the The bluetooth host device selects a fourth audio data packet from each of the second audio data packets according to audio playback requirements, decodes the fourth audio data packet, obtains the first time domain PCM data, and converts the first time domain PCM data. Domain PCM data is sent to the DAC unit of the Bluetooth host device and audio is played. 11. A Bluetooth slave device, comprising a memory and a processor, wherein the memory stores a computer program, wherein the processor implements the audio processing method of the Bluetooth device according to claim 7 when the processor executes the computer program. step. 12. A Bluetooth device, comprising a Bluetooth host device and a Bluetooth slave device; When receiving the first audio data packet to be played, the Bluetooth host device preprocesses the first audio data packet to obtain channel-independent frequency-domain data; and compresses the frequency-domain data of different channels respectively encoding, and obtain the second audio data packet of the corresponding channel; according to the audio playback requirements of the Bluetooth slave device, select a third audio data packet from each of the second audio data packets, wherein the third audio data The package corresponds to the channel in the audio playback requirement; the third audio data package is encapsulated into a Bluetooth data package, and the Bluetooth data package is transmitted to the Bluetooth slave device; The Bluetooth host device selects a fourth audio data packet from each of the second audio data packets according to audio playback requirements, decodes the fourth audio data packet, obtains first time-domain PCM data, and converts the first sending time-domain PCM data to the DAC device of the Bluetooth host device; The bluetooth slave device obtains the third audio data packet from the received bluetooth data packet; parses the third audio data packet to obtain packet header information and data in the packet; verifies the packet header information , if the verification passes, parse the data in the packet to obtain target frequency domain data; convert the target frequency domain data into second time domain PCM data, and send the second time domain PCM data to the The DAC device of the Bluetooth slave device plays audio synchronously with the DAC device of the Bluetooth host device.

Images