CN108882216A - A kind of audio data transmission method and system based on bluetooth BLE technology - Google Patents
A kind of audio data transmission method and system based on bluetooth BLE technology Download PDFInfo
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- CN108882216A CN108882216A CN201810943122.2A CN201810943122A CN108882216A CN 108882216 A CN108882216 A CN 108882216A CN 201810943122 A CN201810943122 A CN 201810943122A CN 108882216 A CN108882216 A CN 108882216A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
Abstract
The present invention relates to a kind of audio data transmission method and system based on bluetooth BLE technology, a kind of audio data transmission method and system based on bluetooth BLE technology, including smart machine, data analyzing and processing software APP and bluetooth equipment BLE.Wherein smart machine is mobile phone, tablet computer etc.；Bluetooth equipment BLE externally carries out bluetooth communication；Wherein installation data interpretation software APP on smart machine；Smart machine passes through the short-range communication between bluetooth communication；To receive the communication of bluetooth equipment BLE；Data analyzing and processing software APP and bluetooth equipment BLE realizes data exchange after establishing connection.Solve the problems, such as it is existing in the related technology because equipment compatibility cause upgrading fail, the cumbersome and time-consuming technical problem of escalation process, improve transmission data reliability, significantly facilitate user use.
Description
Technical field
The present invention relates to bluetooth low energy consumption technologies application field, in particular to a kind of audio number based on bluetooth BLE technology
According to transmission method and system.
Background technique
With the progress of science and technology, bluetooth equipment sets easy to carry, the blue-tooth intelligence terminal with voice interactive system
It increasingly popularizes, brings very big convenience to our life.For example, as long as user tells certain to blue-tooth intelligence terminal
Item requires, such as wants to look into weather or be intended to make a phone call, and system will be taken corresponding according to the voice signal of user
Movement.
Currently, since blue-tooth intelligence terminal does not have the Internet capability generally, but the function of the mobile interchange by mobile phone
Can, realize interactive voice.Process：Blue-tooth intelligence terminal acquires audio, then passes through bluetooth SCO（Synchronous
Connection Oriented link, synchronous connection oriented link）Cell phone application is given delivery of audio data, then by mobile phone
APP is submitted to cloud processing, and cloud is disposed, and returns result to cell phone application, then by cell phone application by audio signal from
Blue-tooth intelligence terminal is broadcasted.It is solved however, the prior art also faces some problems demands：
The channel Bluetooth of mobile phone SCO only one, during voice data transmission, incoming call or other systems grade request, SCO
Channel will be occupied, causes voice data to submit failure, influences user experience；
Because the producer of mobile phone is numerous, batch is also more, and there is bluetooth compatibility issues, in actual measurement, finds often to carry out voice
The channel Bluetooth of mobile phone SCO that interaction will lead to can not establish connection or the SCO channel abnormal that can not restore occurs, thus shadow
The normal function for ringing blue-tooth intelligence terminal uses.
Therefore, it is necessary to a kind of audio data transmission method and system based on bluetooth BLE technology be provided, to solve bluetooth
Intelligent terminal and cell phone application audio data transmission channel single and simple the problem of being postponed by BLE biography voice data, raising is
The stability of system effectively transmits more audio datas, improves user experience.
Summary of the invention
The technical problem to be solved by the present invention is to：A kind of audio data transmission method based on bluetooth BLE technology is provided
And system, above-mentioned drawback can be overcome, be the widely applied trend of the industries such as current bluetooth equipment firmware upgrade.
In order to solve the above technical problems, the present invention provide a kind of audio data transmission method based on bluetooth BLE technology and
System, including smart machine and blue-tooth intelligence terminal.Data analyzing and processing software APP is installed on the smart machine；It is described
Smart machine is equipped with network module and bluetooth BLE module；The blue-tooth intelligence terminal is equipped with peripheral equipment, bluetooth BLE mould
Block and MIC speech ciphering equipment；
Wherein smart machine is mobile phone, tablet computer etc.；
The bluetooth BLE module externally carries out bluetooth communication；
It advanced optimizes, the smart machine receives the indigo plant of blue-tooth intelligence terminal by the short-range communication of bluetooth BLE module
The communication of tooth BLE module；
It advanced optimizes, the blue-tooth intelligence terminal passes through MIC speech ciphering equipment recording acquisition data.
It advanced optimizes, the data of acquisition are generated PCM data by the blue-tooth intelligence terminal；The blue-tooth intelligence terminal is simultaneously
PCM data is subjected to sub-frame processing；The blue-tooth intelligence terminal carries out SBC algorithm coding to every frame PCM data；
160 byte datas of each frame are passed through SBC algorithm coding by the blue-tooth intelligence terminal, by 8：1 is compressed into 20 bytes
Data.The audio data of generation is put into data pool.
It advanced optimizes, the blue-tooth intelligence terminal distributes each bag data by BLU bluetooth module, and pending datas is waited to analyze
Processing software APP is responded, and is received the reply of 0x01, is then sent next packet, if receiving 0x00 or confiscating back more than 300ms
It answers, then it is assumed that transmission failure needs retransmission data；Data one are wrapped according to above-mentioned rule and issue hand by blue-tooth intelligence terminal
Machine data analyzing and processing software APP, until not having voice data in data pool.
It advanced optimizes, the number that the mobile phone interpretation software APP is received BLE module by preset parsing specification
According to reduction SBC original audio；The mobile phone interpretation software APP is decoded by SBC, and each frame data obtain 160 audio frequency of byte
Data are simultaneously stored in buffer area；By being compared with initial data：By the optimization of calibration parameter, initial data and SBC are decoded
Data afterwards are consistent up to 97%.
It advanced optimizes, carries out SBC algorithm after the data of the data analyzing and processing software APP acquisition blue-tooth intelligence terminal
Decoding；Decoded audio data is issued application service by network module by the data analyzing and processing software APP.
It advanced optimizes, the audio data after the processing software APP synchronous decoding, is issued by network module using clothes
Business processing；By the timeliness of actual measurement verifying voice transfer, delay time is in 500ms.
It advanced optimizes, a kind of work step of audio data transmission method and system based on bluetooth BLE technology is as follows：
A, the BLE bluetooth module of the data analyzing and processing software APP search blue-tooth intelligence terminal in smart machine, and establish BLE
Bluetooth connection；
B, the MIC speech ciphering equipment recording for starting blue-tooth intelligence terminal acquires and generates PCM data；
C, blue-tooth intelligence terminal carries out sub-frame processing to PCM data；
D, blue-tooth intelligence terminal carries out SBC algorithm coding to every frame PCM data；
E, the data after coding are transmitted to the data in smart machine by blue-tooth intelligence terminal by the bluetooth communication of BLE bluetooth module
Interpretation software APP；
F, smart machine receives the data of blue-tooth intelligence terminal transmission by BLE bluetooth module；Then APP pairs of interpretation software
The data of BLE bluetooth module transmission carry out the decoding of SBC algorithm；
H, the audio data after the interpretation software APP synchronous decoding of smart machine and application service is issued.
After above-mentioned technical proposal, the beneficial effects of the invention are as follows：
Scheme compared with the prior art provides a kind of audio data transmission method and system based on bluetooth BLE technology, solves
Existing blue-tooth intelligence terminal in the related technology passes voice number with the single and simple BLE of cell phone application audio data transmission channel
The problem of according to delay, the stability of system is improved, effectively transmit more audio datas, improves user experience.
Detailed description of the invention
Fig. 1 is bluetooth equipment firmware upgrade method and system operational module figure based on software APP technology
Fig. 2 is bluetooth equipment firmware upgrade method and working-flow figure based on software APP technology
Specific embodiment
1 to attached drawing 2 and specific embodiment, the present invention will be described in detail with reference to the accompanying drawing, but not as to the present invention
Restriction.
As shown in attached drawing 1 to attached drawing 2, a kind of audio data transmission method and system based on bluetooth BLE technology, including intelligence
It can equipment and blue-tooth intelligence terminal.Data analyzing and processing software APP is installed on the smart machine；It is set on the smart machine
There are network module and bluetooth BLE module；The blue-tooth intelligence terminal is equipped with peripheral equipment, bluetooth BLE module and MIC voice and sets
It is standby；Wherein smart machine is mobile phone, tablet computer etc.；The bluetooth BLE module externally carries out bluetooth communication；The intelligence is set
The communication of the standby bluetooth BLE module that blue-tooth intelligence terminal is received by the short-range communication of bluetooth BLE module；The bluetooth intelligence
Energy terminal passes through MIC speech ciphering equipment recording acquisition data.The data of acquisition are generated PCM data by the blue-tooth intelligence terminal；Institute
It states blue-tooth intelligence terminal and PCM data is subjected to sub-frame processing；The blue-tooth intelligence terminal carries out SBC calculation to every frame PCM data
Method coding.The decoding of SBC algorithm is carried out after the data of the data analyzing and processing software APP acquisition blue-tooth intelligence terminal；The number
By decoded audio data and application service is issued according to interpretation software APP.
A kind of audio data transmission method and system based on bluetooth BLE technology as shown in Fig. 1 and Fig. 2, with an intelligence
For energy mobile phone and a smart bluetooth equipment BLE speaker.
It is mainly included the following steps that：
The BLE bluetooth module of data analyzing and processing software APP search blue-tooth intelligence terminal in S101 smart machine, and establish
BLE bluetooth connection；
In embodiments of the present invention, the blue-tooth intelligence terminal can be blue-tooth intelligence earphone, blue-tooth intelligence speaker etc., pass through hand
Machine APP opens bluetooth, searches for blue-tooth intelligence terminal, according to preset UUID and title automatic fitration UUID and bluetooth title and builds
Vertical BLE bluetooth connection, data in mobile phone interpretation software APP and blue-tooth intelligence terminal are logical by the bluetooth between BLE bluetooth module
The achievable data interaction of letter.
The mic module recording of S102 starting blue-tooth intelligence terminal acquires and generates PCM data；
In embodiments of the present invention, blue-tooth intelligence speaker presses the button starting mic module by key wakeup interactive voice
Recording acquisition, unclamps key, stops the recording acquisition of mic module；Start audio collection and uses single channel, sample rate 16KHZ, essence
The PCM audio data that degree is 16, the audio data of generation is put into data pool.
S103 blue-tooth intelligence terminal carries out sub-frame processing to PCM data；
In embodiments of the present invention, in order to reduce error rate and BLE be facilitated to transmit data, blue-tooth intelligence speaker is by every 160 words
Joint number evidence is divided into a frame, and the audio data after segmentation is passed to the SBC algorithm coding of next step, and whether program cyclic query has
Coded audio data needs to send, and if having data, data processing is just taken from data pool, until not having data to be in data pool
Only.
S104 blue-tooth intelligence terminal carries out SBC algorithm coding to every frame PCM data；
In embodiments of the present invention, 160 byte datas of each frame are passed through SBC algorithm coding by blue-tooth intelligence speaker, by 8：1 pressure
Shorten 20 byte datas into, but in fact, only 19 bytes valid data, sbc audio coding uses following parameter：
#define MSBC_SYNCWORD 0xAD // synchronization character is 0xAD
frame->blocks = 10; //10
frame->sample_rate_index = 0;// sample rate 16K
frame->channel_mode = 0;// single channel
frame->allocation_method = 0; //loudness
frame->subbands = 8;// 8 subbands
frame->bitpool = 12; //26bit
Source data after SBC coding is generally：First 3 byte (0xAD310C)+CRC (1 byte)+data (19 byte)：
| SBC format header | CRC check | Audio data |
| 3Byte is fixed as 0xAD310C | 1Byte | 19Byte |
Since in every frame SBC coded data, real data only has 19 bytes after coding, as long as so send this 19 numbers can
With, by the data transmission format appointed, reduce transmission data, compressed 3 byte-headers of SBC removed, only retain CRC and
The audio data of 19 bytes：
| CRC check | Audio data |
| 1Byte | 19Byte |
Data after coding are transmitted in smart machine by S105 blue-tooth intelligence terminal by the bluetooth communication of BLE bluetooth module
Data analyzing and processing software APP；
In embodiments of the present invention, blue-tooth intelligence equipment by the data after coding by BLE be transmitted to data in mobile phone analysis processing it is soft
Part APP is related to blue-tooth intelligence equipment and data is issued data in mobile phone interpretation software APP and data in mobile phone interpretation software
APP gives blue-tooth intelligence equipment response.
Firstly, the transmission of BLE data needs to appoint each UUID, such as：
The UUID of BLE service:
public String UUID_SERVICE = "0000ff00-0000-1000-8000-00805f9b34fb";
The UUID in data transmission characteristics channel：
public String UUID_CHARATERISTIC_VOICE = "0000ff01-0000-1000-8000-
00805f9b34fb";
Then, audio data is sent by the data format appointed, in order to guarantee data normal transmission, and considers Bluetooth of mobile phone
Version it is inconsistent, if any mobile phone support BLE4.0, some mobile phones to support BLE4.2, some support BLE5.0, although version
Higher, the data volume of every packet transmission is bigger, but most mobile phone only supports BLE4.0 at this stage, so the unified rule for pressing BLE4.0
Model docking, the corresponding packet BLE data of a just frame audio original data, 20 bytes of every packet are 19+1 words of audio frequency of byte data
Save CRC check：
| Audio data | CRC check |
| 19Byte | 1Byte |
After data in mobile phone interpretation software APP receives the data packet of BLE bluetooth module transmission, the validity of audio data is carried out
Verifying calculates check value using general CRC8：
public byte calcCrc8 (byte[] data, int len){
……
crc = SBC_CRC_TABLE[crc ^ data[0]];
crc = SBC_CRC_TABLE[crc ^ data[1]];
data++; //Skip CRC byte
for(i = 2; i < len / 8; i++)
{
crc = SBC_CRC_TABLE[crc ^ data[i]];
}
octet = data[i];
for(i = 0; i < (len & 7); i++)
{
byte bit = ((octet ^ crc) & 0x80) >> 7;
crc = ((crc & 0x7f) << 1) ^ (bit 0x1d : 0);
octet = octet << 1;
}
return crc;
}
Data in mobile phone interpretation software APP is according to the crc value ratio carried in the above-mentioned CRC check value and data packet calculated
Compared with, if unanimously, illustrating that data are effective, 0x01 is replied, if inconsistent, is illustrated in vain, reply 0x00, cell phone application reply bluetooth intelligence
Can the BLE data format of equipment be：
| Protocol header | Data field | CRC check |
| 1Byte is fixed as 0x81 | 1Byte (0x00 or 0x01) | 1Byte |
Blue-tooth intelligence speaker distributes each bag data, awaits a response, and receives the reply of 0x01, then sends next packet, if receiving
0x00 confiscates response more than 300ms, then it is assumed that transmission failure needs retransmission data.Blue-tooth intelligence equipment is according to above-mentioned
Data one are wrapped and issue data in mobile phone interpretation software APP, until not having voice data in data pool by rule.
S106 smart machine receives the data of blue-tooth intelligence terminal transmission by BLE bluetooth module；Then analysis processing is soft
Part APP carries out the decoding of SBC algorithm to the data that BLE bluetooth module transmits；
In embodiments of the present invention, mobile phone interpretation software APP presses preset parsing specification for BLE data convert SBC original sound
Frequently.
Firstly, addition data head：
public static void create(byte[] source, Handler handler) {
mPcmPacket = new PcmPacket();
mPcmPacket.mDatas = new byte[source.length + 4];
mPcmPacket.mDatas[0] = (byte) 0xAD;
mPcmPacket.mDatas[1] = (byte) 0x31;
mPcmPacket.mDatas[2] = (byte) 0x0C;
System.arraycopy(source, 0, mPcmPacket.mDatas, 4, source.length);
}
Then, SBC algorithm decoding parametric is initialized：
public class SbcDecoderContext { SbcCommonContext frame = new
SbcCommonContext();
byte num_channels = 1;// channels number
byte pcm_length = 8 * 10; // PCM length
short sample_rate = 16000; // sample rate
int pcm_sample[][] = new int[2][128]; // PCM frame buffer
int vfifo[][] = new int[2][170]; // FIFOint offset[][] = new int[2]
[16];
}
Then, SBC algorithm decoding interface is called to be decoded：
public byte[] sbc_decoder_frame_decode(byte[] data, int length) {
The initialization of ... // compensating parameter
for (ch = 0; ch < sbc.num_channels; ch++) {
for (sb = 0; sb < frame.subbands; sb++) {
frame.scale_factor[ch][sb] = (byte) ((data[consumed >> 3] >> (4 -
(consumed & 0x7))) & 0x0F);
consumed += 4;
}}
The reduction of //SBC data is all
for (blk = 0; blk < frame.blocks; blk++) {
for (ch = 0; ch < sbc.num_channels; ch++) {
for (sb = 0; sb < frame.subbands; sb++) {
if (frame.mem[ch][sb] > 0) {
…… sbc.pcm_sample[ch][blk * frame.subbands + sb] =
(((value << 1) | 1) << frame.scale_factor[ch][sb]) / frame.mem[ch][sb]
- (1 << frame.scale_factor[ch][sb]);
} else {
sbc.pcm_sample[ch][blk * frame.subbands + sb] = 0;
} }}}
}
Finally, being decoded by SBC, each frame data obtain 160 audio frequency of byte data and are stored in buffer area.By with it is original
Data comparison：By the optimization of calibration parameter, initial data and the decoded data of SBC are consistent up to 97%.
Audio data after the interpretation software APP synchronous decoding of S107 smart machine simultaneously issues application service；
In embodiments of the present invention, the audio data after mobile phone interpretation software APP synchronous decoding, is issued at application service
Reason；By the timeliness of actual measurement verifying voice transfer, delay time in 500ms, in the need for meeting the application of daily interactive voice
It asks down, moreover it is possible to obtain preferable acoustical quality.
As known by the technical knowledge, the technical program can pass through other essence without departing from its spirit or the reality of essential feature
Scheme is applied to realize.Therefore, embodiment disclosed above, in all respects are merely illustrative, and are not only
's.All changes within the scope of the invention or within the scope equivalent to the present invention are included in the invention.
Claims (9)
1. a kind of audio data transmission method and system based on bluetooth BLE technology, including smart machine and blue-tooth intelligence terminal；
Data analyzing and processing software APP is installed on the smart machine；The smart machine is equipped with network module and bluetooth
BLE module；The blue-tooth intelligence terminal is equipped with peripheral equipment, bluetooth BLE module and MIC speech ciphering equipment；
Wherein smart machine is mobile phone, tablet computer etc.；The bluetooth BLE module externally carries out bluetooth communication.
2. a kind of audio data transmission method and system based on bluetooth BLE technology according to claim 1, feature exist
In：The smart machine receives the logical of the bluetooth BLE module of blue-tooth intelligence terminal by the short-range communication of bluetooth BLE module
News.
3. a kind of audio data transmission method and system based on bluetooth BLE technology according to claim 1, feature exist
In：The blue-tooth intelligence terminal passes through MIC speech ciphering equipment recording acquisition data.
4. a kind of audio data transmission method and system based on bluetooth BLE technology according to claim 1, feature exist
In：The data of acquisition are generated PCM data by the blue-tooth intelligence terminal；The blue-tooth intelligence terminal is simultaneously divided PCM data
Frame processing；The blue-tooth intelligence terminal carries out SBC algorithm coding to every frame PCM data；
160 byte datas of each frame are passed through SBC algorithm coding by the blue-tooth intelligence terminal, by 8：1 is compressed into 20 bytes
Data；
The audio data of generation is put into data pool.
5. a kind of audio data transmission method and system based on bluetooth BLE technology according to claim 4, feature exist
In：The blue-tooth intelligence terminal distributes each bag data by BLU bluetooth module, and data analyzing and processing software APP is waited to respond,
The reply of 0x01 is received, then sends next packet, if receiving 0x00 or confiscating response more than 300ms, then it is assumed that transmission is lost
It loses, needs retransmission data；Blue-tooth intelligence terminal according to above-mentioned rule, data one are wrapped issue data in mobile phone analysis processing it is soft
Part APP, until not having voice data in data pool.
6. a kind of audio data transmission method and system based on bluetooth BLE technology according to claim 1, feature exist
In：The data convert SBC original audio that the mobile phone interpretation software APP is received BLE module by preset parsing specification；
The mobile phone interpretation software APP is decoded by SBC, and each frame data obtain 160 audio frequency of byte data and are stored in caching
Qu Zhong；By being compared with initial data：By the optimization of calibration parameter, initial data and the decoded data of SBC are up to 97% 1
It causes.
7. a kind of audio data transmission method and system based on bluetooth BLE technology according to claim 1, feature exist
In：The decoding of SBC algorithm is carried out after the data of the data analyzing and processing software APP acquisition blue-tooth intelligence terminal；The data point
It analyses processing software APP and decoded audio data is issued into application service by network module.
8. a kind of audio data transmission method and system based on bluetooth BLE technology according to claim 1, feature exist
In：Audio data after the processing software APP synchronous decoding issues application service processing by network module；Pass through actual measurement
The timeliness of voice transfer is verified, delay time is in 500ms.
9. a kind of audio data transmission method and system based on bluetooth BLE technology according to claim 1, feature exist
In：A kind of work step of audio data transmission method and system based on bluetooth BLE technology is as follows：
A, the BLE bluetooth module of the data analyzing and processing software APP search blue-tooth intelligence terminal in smart machine, and establish BLE
Bluetooth connection；
B, the MIC speech ciphering equipment recording for starting blue-tooth intelligence terminal acquires and generates PCM data；
C, blue-tooth intelligence terminal carries out sub-frame processing to PCM data；
D, blue-tooth intelligence terminal carries out SBC algorithm coding to every frame PCM data；
E, the data after coding are transmitted to the data in smart machine by blue-tooth intelligence terminal by the bluetooth communication of BLE bluetooth module
Interpretation software APP；
F, smart machine receives the data of blue-tooth intelligence terminal transmission by BLE bluetooth module；Then APP pairs of interpretation software
The data of BLE bluetooth module transmission carry out the decoding of SBC algorithm；
H, the audio data after the interpretation software APP synchronous decoding of smart machine and application service is issued.
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