CN101222793B - Method and system for regulating bluetooth stereo acoustic quality - Google Patents
Method and system for regulating bluetooth stereo acoustic quality Download PDFInfo
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- CN101222793B CN101222793B CN2008100568921A CN200810056892A CN101222793B CN 101222793 B CN101222793 B CN 101222793B CN 2008100568921 A CN2008100568921 A CN 2008100568921A CN 200810056892 A CN200810056892 A CN 200810056892A CN 101222793 B CN101222793 B CN 101222793B
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Abstract
The present invention discloses a method for adjusting the tone quality of Bluetooth stereo, comprising the following: step 1, decoding an audio document, outputting pulse code modulation audio data; step 2, receiving the pulse code modulation audio data; configuring the bit reservoir in subband compression algorithm according to audio document parameters; coding the pulse code modulation audio data with the subband compression algorithm to adjust the tone quality of Bluetooth stereo; step 3, combining the data coded according to the subband compression algorithm into advanced audio transmission specification frames to send to a Bluetooth stereo playing device. Therefore, the bit reservoir value can be configured automatically to aim at the audio document with different sample rates, and to dynamically adapt to the currently played audio document to adjust the tone quality performance of Bluetooth stereo to obtain better tone quality.
Description
Technical field
The present invention relates to the speech processes field, relate in particular to a kind of method and system of regulating Bluetooth stereo acoustic quality.
Background technology
When audio frequency PCM (Pulse Code Modulation, pulse code modulation) data go up transmission at serial UART (Universal Asynchronous Receiver/Transmitter, UART Universal Asynchronous Receiver Transmitter), need bigger bandwidth.For under the finite bandwidth situation, transmit more voice data effectively.Therefore, will carry out compressed encoding, and adopt SBC (SubBandCoding, sub-band coding) algorithm that voice data is carried out compressed encoding in the method audio frequency PCM uncorrected data.But this algorithm is a lossy compression method, can lose original tonequality to a certain extent.
The prior art scheme is provided with bit pond value in the SBC algorithm for the user according to self-perception.Such as, it is 30 that bit pond value is set earlier, plays the Bluetooth stereo music, and acoustical quality is bad, thereby it is 48 that the user is provided with bit pond value once more, plays the Bluetooth stereo music, and acoustical quality is all right, thereby determines that bit pond value is 48.The problem that the user sets bit pond value scheme comprises: bit pond value in can not automatic setting SBC algorithm; Can not cooperate with intelligent terminal is fine, be worth when excessive, intelligent terminal may occur and use too much system CPU resource, thereby influence the acoustical quality of Bluetooth stereo when setting the bit pond; Can't dynamically arrange bit pond value at the audio file of different sample rates, thus bit pond value can not with the audio file dynamic adaptation of current broadcast, thereby influence the acoustical quality of Bluetooth stereo.
Summary of the invention
In order to address the above problem, the invention provides and disclose a kind of method and system of regulating Bluetooth stereo acoustic quality, its purpose is, by the bit pond value in the SBC algorithm is set, comes to regulate Bluetooth stereo acoustic quality according to actual conditions.
The invention discloses a kind of method of regulating Bluetooth stereo acoustic quality, comprising:
Step 1, with the audio file decoding, output pulse code modulation voice data;
Step 2, received pulse coded modulation voice data is provided with bit pond in the sub-band coding algorithm according to the audio file parameter, and described pulse code modulation voice data is carried out described sub-band coding algorithm coding, thereby regulates Bluetooth stereo acoustic quality;
Step 3 transmits the specification frame with the synthetic advanced audio frequency of the data set behind the described sub-band coding algorithm coding, sends to the Bluetooth stereo playing device;
Described step 1 and step 2 also comprise step 61, described pulse code modulation voice data is divided into specified bytes after, transmit.
Described audio file parameter comprises sample rate, channel pattern, transmission rate, sub band number and the quantizer number of audio file.
When described audio file channel mode was monophony, bit pond method to set up further comprised the steps: in the described step 2
Step 31 is according to formula
((transmission rate * sub band number * quantizer number/sample rate)-8 * sub band number-32)/quantizer number
Calculate quotient and the remainder, the unit of transmission rate is a bits per second in the described formula, and the unit of sample rate is a KHz;
Step 32, judge described remainder in-scope, if described remainder is more than or equal to 3/4ths of described quantizer number, described bit pond value then is set adds one for described merchant, if remainder is greater than four of quantizer number/in the lump less than 3/4ths of quantizer number, then described bit pond preference value is described merchant, bit pond value by turns adds one for described merchant, by rotational cycle described bit pond value is set and is described preference value or described value by turns, if, then being provided with described bit pond value more than or equal to zero and smaller or equal to 1/4th of quantizer number, remainder is described merchant.
In described audio file channel mode is dual track or when stereo, bit pond method to set up further comprises the steps: in the described step 2
Step 41 is according to formula
((transmission rate * sub band number * quantizer number/sample rate)-4 * sub band number-32)/(quantizer number * 2)
Calculate quotient and the remainder, the unit of transmission rate is a bits per second in the described formula, and the unit of sample rate is a KHz;
Step 42, judge described remainder in-scope, if described remainder is more than or equal to 3/2nds of described quantizer number, described bit pond value then is set adds one for described merchant, if remainder is greater than two of quantizer number/in the lump less than 3/2nds of quantizer number, then described bit pond preference value is described merchant, described bit pond value by turns adds one for described merchant, by rotational cycle described bit pond value is set and is described preference value or described value by turns, if, then being provided with described bit pond value more than or equal to zero and smaller or equal to 1/2nd of quantizer number, remainder is described merchant.
The invention also discloses a kind of system that regulates Bluetooth stereo acoustic quality, comprise that audio decoder, sub-band coding module, frame composite module and frame cut apart module,
Described audio decoder is used for the decoded audio file, output pulse code modulation voice data;
Described sub-band coding module, be used for received pulse coded modulation voice data, according to the audio file parameter bit pond in the sub-band coding algorithm is set, described pulse code modulation voice data is carried out described sub-band coding algorithm coding, thereby regulate Bluetooth stereo acoustic quality;
Described frame composite module is used for the synthetic advanced audio frequency of the data set behind the described sub-band coding algorithm coding is transmitted the specification frame, sends to the Bluetooth stereo playing device;
Described frame is cut apart module, after being used for the pulse code modulation voice data is divided into specified bytes, is transferred to described sub-band coding module.
Described audio file parameter comprises sample rate, channel pattern, transmission rate, sub band number and the quantizer number of audio file.
When described audio file channel mode was monophony, described sub-band coding module was further used for according to formula
((transmission rate * sub band number * quantizer number/sample rate)-8 * sub band number-32)/quantizer number
Calculate quotient and the remainder, the unit of transmission rate is a bits per second in the described formula, the unit of sample rate is a KHz, judge described remainder in-scope, if described remainder is more than or equal to 3/4ths of described quantizer number, described bit pond value then is set adds one for described merchant, if remainder is greater than four of quantizer number/in the lump less than 3/4ths of quantizer number, then described bit pond preference value is described merchant, bit pond value by turns adds one for described merchant, described bit pond value is set for described preference value or described value by turns by rotational cycle, is described merchant if remainder, then is provided with described bit pond value more than or equal to zero and smaller or equal to 1/4th of quantizer number.
In described audio file channel mode is dual track or when stereo, described sub-band coding module is further used for according to formula
((transmission rate * sub band number * quantizer number/sample rate)-4 * sub band number-32)/(quantizer number * 2)
Calculate quotient and the remainder, the unit of transmission rate is a bits per second in the described formula, the unit of sample rate is a KHz, judge described remainder in-scope, if described remainder is more than or equal to 3/2nds of described quantizer number, described bit pond value then is set adds one for described merchant, if remainder is greater than two of quantizer number/in the lump less than 3/2nds of quantizer number, then described bit pond preference value is described merchant, the value by turns in described bit pond adds one for described merchant, by rotational cycle described bit pond value is set and is described preference value or described value by turns, if, then being provided with described bit pond value more than or equal to zero and smaller or equal to 1/2nd of quantizer number, remainder is described merchant.
Beneficial effect of the present invention is, uses the present invention, and bit pond value can be set automatically at the audio file of different sample rates, and is dynamically adaptive with the audio file of current broadcast, regulates the acoustical quality of Bluetooth stereo, obtains better tonequality.
Description of drawings
Fig. 1 is SBC algorithm coding subsystem structure figure.
Embodiment
Now propose a kind of embodiment, but the invention is not restricted to this concrete scheme based on the present invention.
Structure for system of the present invention, adoptable hardware plan is, primary processor adopts the chip based on the IntelXscale framework, Bluetooth chip adopts CSR company the 4th generation Bluetooth chip, adopt UART (UART Universal Asynchronous Receiver Transmitter) transmission means rather than USB (USB) transmission means, thereby primary processor and Bluetooth chip can pass through three holding wire (UART_TX, UART_RX, GND) realize communication, its Bluetooth chip maximum transmission rate can reach 3Mbps, and the supported peak transfer rate of primary processor is 900Kbps, therefore, cooperation UART transmission rate between the two can reach 900Kbps, can satisfy the bandwidth of transmission Bluetooth stereo voice data.
As shown in Figure 1, system of the present invention comprises:
Audio decoder is used for the decoded audio file, output pcm audio data;
Frame is cut apart module, is used for the pcm audio data are divided into 512 bytes, is transferred to the SBC encoder;
The SBC coding module is used to receive the pcm audio data after cutting apart, and according to the audio file parameter bit pond in the SBC algorithm is set, and described pcm audio data are carried out described SBC algorithm coding, thereby regulates Bluetooth stereo acoustic quality;
The frame composite module is used for the data accumulation behind the SBC algorithm coding when the maximum transfer unit, is combined into A2DP (Advanced Audio Distribution Profile, advanced audio frequency transmits specification) frame, sends to the Bluetooth stereo playback equipment.
The inventive method is,
The audio file of different sample rates of step 1 and different-format is exported the pcm audio data through audio decoder decode;
Step 2, frame are cut apart module one frame pcm audio data are cut apart according to 512 bytes, input to SBC algorithm coding module;
Step 3, SBC algorithm coding module is provided with bit pond in the SBC algorithm according to the audio file parameter, carries out the SBC algorithm coding;
Step 4, the frame composite module voice data after with the SBC algorithm coding is added to maximum transfer unit, and the voice data behind the SBC coding is combined as the A2DP frame, is sent to the Bluetooth stereo playing device.
Bit pond value method to set up is as described below in the SBC algorithm.
Carry out in the SBC algorithm coding process at voice data, regulate tonequality according to actual conditions by the bit pond is set, thereby when playing the Bluetooth stereo music, can obtain acoustical quality preferably.Usually, in the SBC algorithm bit pond value scope is set is between 24～64.Bit pond value grade classification is in the SBC algorithm, and 30 are expressed as difference tone matter, and 40 are expressed as medium tonequality, and 48 are expressed as better tonequality, and 58 are expressed as best tonequality.Generally speaking, default settings is 32.Be provided with for bit pond value, realize dynamic auto adjusting according to the running environment parameter.Adjusting tonequality mainly is the parameter according to audio file, and sample rate (16000Hz/32000Hz/44100Hz/48000Hz), channel pattern (monophony/dual track/stereo), transmission rate, subband (4/8) and quantizer (4/8/12/16) are provided with.
Its concrete computational methods are:
When described audio file channel mode is monophony, according to formula
((transmission rate * sub band number * quantizer number/sample rate)-8 * sub band number-32)/quantizer number
Calculate quotient and the remainder, the unit of transmission rate is bps (bits per second) in the formula, and the unit of sample rate is KHz.
Judge described remainder in-scope;
If described remainder is non-vanishing and more than or equal to 3/4ths of described quantizer number, described bit pond value then is set adds one for described merchant;
If remainder is non-vanishing and greater than four of quantizer number/in the lump less than 3/4ths of quantizer number, then described bit pond preference value is described merchant, bit pond value by turns adds one for described merchant, by rotational cycle described bit pond value is set and is described preference value or described value by turns, rotational cycle is 2, a frame voice data adopts bit pond preference value in the SBC algorithm when playing current music, and then the next frame voice data adopts bit pond value by turns, and bit pond value is set successively by turns;
If, then being provided with bit pond value more than or equal to zero and smaller or equal to 1/4th of quantizer number, remainder is described merchant.
In described audio file channel mode is dual track or when stereo, according to formula
((transmission rate * sub band number * quantizer number/sample rate)-4 * sub band number-32)/(quantizer number * 2)
Calculate quotient and the remainder, the unit of transmission rate is bps in the described formula, and the unit of sample rate is KHz;
Judge described remainder in-scope;
If described remainder is non-vanishing and more than or equal to 3/2nds of described quantizer number, described bit pond value then is set adds one for described merchant;
If remainder is non-vanishing and greater than two of quantizer number/in the lump less than 3/2nds of quantizer number, then described bit pond preference value is described merchant, bit pond value by turns adds one for described merchant, by rotational cycle described bit pond value is set and is described preference value or described value by turns, rotational cycle is 2, a frame voice data adopts first-selected bit pond value in the SBC algorithm when playing current music, and then the next frame voice data adopts the bit pond value that can use by turns, and bit pond value is set successively by turns;
If remainder is not less than zero and smaller or equal to 1/2nd of quantizer number, it is described merchant that bit pond value then is set.
Claims (8)
1. a method of regulating Bluetooth stereo acoustic quality is characterized in that, comprising:
Step 1, with the audio file decoding, output pulse code modulation voice data;
Step 2, received pulse coded modulation voice data is provided with bit pond in the sub-band coding algorithm according to the audio file parameter, and described pulse code modulation voice data is carried out described sub-band coding algorithm coding, thereby regulates Bluetooth stereo acoustic quality;
Step 3 transmits the specification frame with the synthetic advanced audio frequency of the data set behind the described sub-band coding algorithm coding, sends to the Bluetooth stereo playing device;
Wherein, described step 1 and step 2 also comprise step 61, described pulse code modulation voice data is divided into specified bytes after, transmit.
2. regulate the method for Bluetooth stereo acoustic quality according to claim 1, it is characterized in that, described audio file parameter comprises sample rate, channel pattern, transmission rate, sub band number and the quantizer number of audio file.
3. as the method for adjusting Bluetooth stereo acoustic quality as described in the claim 2, it is characterized in that when described audio file channel mode was monophony, bit pond method to set up further comprised the steps: in the described step 2
Step 31 is according to formula
((transmission rate * sub band number * quantizer number/sample rate)-8 * sub band number-32)/quantizer number
Calculate quotient and the remainder, the unit of transmission rate is a bits per second in the described formula, and the unit of sample rate is a KHz;
Step 32, judge described remainder in-scope, if described remainder is more than or equal to 3/4ths of described quantizer number, described bit pond value then is set adds one for described merchant, if remainder is greater than four of quantizer number/in the lump less than 3/4ths of quantizer number, then described bit pond preference value is described merchant, bit pond value by turns adds one for described merchant, by rotational cycle described bit pond value is set and is described preference value or described value by turns, if, then being provided with described bit pond value more than or equal to zero and smaller or equal to 1/4th of quantizer number, remainder is described merchant.
4. as the method for adjusting Bluetooth stereo acoustic quality as described in claim 2 or 3, it is characterized in that, is dual track or when stereo, bit pond method to set up further comprises the steps: in the described step 2 in described audio file channel mode
Step 41 is according to formula
((transmission rate * sub band number * quantizer number/sample rate)-4 * sub band number-32)/(quantizer number * 2)
Calculate quotient and the remainder, the unit of transmission rate is a bits per second in the described formula, and the unit of sample rate is a KHz;
Step 42, judge described remainder in-scope, if described remainder is more than or equal to 3/2nds of described quantizer number, described bit pond value then is set adds one for described merchant, if remainder is greater than two of quantizer number/in the lump less than 3/2nds of quantizer number, then described bit pond preference value is described merchant, described bit pond value by turns adds one for described merchant, by rotational cycle described bit pond value is set and is described preference value or described value by turns, if, then being provided with described bit pond value more than or equal to zero and smaller or equal to 1/2nd of quantizer number, remainder is described merchant.
5. system that regulates Bluetooth stereo acoustic quality comprises that audio decoder, sub-band coding module frame composite module and frame cut apart module, it is characterized in that,
Described audio decoder is used for the decoded audio file, output pulse code modulation voice data;
Described sub-band coding module, be used for received pulse coded modulation voice data, according to the audio file parameter bit pond in the sub-band coding algorithm is set, described pulse code modulation voice data is carried out described sub-band coding algorithm coding, thereby regulate Bluetooth stereo acoustic quality;
Described frame composite module is used for the synthetic advanced audio frequency of the data set behind the described sub-band coding algorithm coding is transmitted the specification frame, sends to the Bluetooth stereo playing device;
Described frame is cut apart module, after being used for the pulse code modulation voice data is divided into specified bytes, is transferred to described sub-band coding module.
6. as the system of adjusting Bluetooth stereo acoustic quality as described in the claim 5, it is characterized in that described audio file parameter comprises sample rate, channel pattern, transmission rate, sub band number and the quantizer number of audio file.
7. as the system of adjusting Bluetooth stereo acoustic quality as described in the claim 6, it is characterized in that when described audio file channel mode was monophony, described sub-band coding module was further used for according to formula
((transmission rate * sub band number * quantizer number/sample rate)-8 * sub band number-32)/quantizer number
Calculate quotient and the remainder, the unit of transmission rate is a bits per second in the described formula, the unit of sample rate is a KHz, judge described remainder in-scope, if described remainder is more than or equal to 3/4ths of described quantizer number, described bit pond value then is set adds one for described merchant, if remainder is greater than four of quantizer number/in the lump less than 3/4ths of quantizer number, then described bit pond preference value is described merchant, bit pond value by turns adds one for described merchant, described bit pond value is set for described preference value or described value by turns by rotational cycle, is described merchant if remainder, then is provided with described bit pond value more than or equal to zero and smaller or equal to 1/4th of quantizer number.
8. as the system of adjusting Bluetooth stereo acoustic quality as described in claim 6 or 7, it is characterized in that, is dual track or when stereo, described sub-band coding module is further used for according to formula in described audio file channel mode
((transmission rate * sub band number * quantizer number/sample rate)-4 * sub band number-32)/(quantizer number * 2)
Calculate quotient and the remainder, the unit of transmission rate is a bits per second in the described formula, the unit of sample rate is a KHz, judge described remainder in-scope, if described remainder is more than or equal to 3/2nds of described quantizer number, described bit pond value then is set adds one for described merchant, if remainder is greater than two of quantizer number/in the lump less than 3/2nds of quantizer number, then described bit pond preference value is described merchant, the value by turns in described bit pond adds one for described merchant, by rotational cycle described bit pond value is set and is described preference value or described value by turns, if, then being provided with described bit pond value more than or equal to zero and smaller or equal to 1/2nd of quantizer number, remainder is described merchant.
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| CN101453516B (en) * | 2008-11-19 | 2011-01-12 | 闻泰集团有限公司 | Bluetooth MP3 playing method on mobile phone and mobile phone thereof |
| CN102355309A (en) * | 2011-08-09 | 2012-02-15 | 中兴通讯股份有限公司 | Method and apparatus for realization of Bluetooth stereophonic sound with support of a plurality of sampling rates |
| CN102571209B (en) * | 2011-12-20 | 2015-01-28 | 深圳市大族激光科技股份有限公司 | Optical fiber communication device of laser marking control system and coding method |
| CN113489568B (en) | 2018-02-14 | 2022-05-13 | 华为技术有限公司 | Method and device for transmitting audio data at high speed |
| CN108648772A (en) * | 2018-04-19 | 2018-10-12 | 上海康斐信息技术有限公司 | A kind of the Bluetooth audio frequency playback method and electronic equipment of low-power consumption |
| CN109286922B (en) * | 2018-09-27 | 2021-09-17 | 珠海市杰理科技股份有限公司 | Bluetooth prompt tone processing method, system, readable storage medium and Bluetooth device |
| CN114863942B (en) * | 2022-07-05 | 2022-10-21 | 北京百瑞互联技术有限公司 | Model training method for voice quality conversion, method and device for improving voice quality |
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