CN101393743A - Stereo encoding apparatus capable of parameter configuration and encoding method thereof - Google Patents
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Abstract
The invention discloses a stereo coding device with configurable parameters, wherein a preprocessing module is used for converting stereo audio signals into sum/difference sound channel signals and carrying out the linear filtering prediction analysis to acquire the sum sound channel residual signal and the difference sound channel residual signal; a signal estimation module is used for acquiring the estimation signal of the difference sound channel residual through estimating the residual of the difference sound channel by utilizing the residual of the sum sound channel; a coefficient extracting module is used for carrying out the time-frequency transformation and carrying out the low-frequency and high-frequency extraction of the frequency domain coefficient acquired from the time-frequency transformation; a gain calculation module is used for acquiring the original left/right sound channel high-frequency element and the estimated left/right sound channel high-frequency element, and further the gain coefficient of the left/right sound channel; and a data coding module is used for carrying out the quantization coding and forming the code data stream. The invention further discloses a stereo coding method with configurable parameters. The invention can not only maintain the coding quality, but also reduce the coding complexity.
Description
Technical field
The present invention relates to a kind of stereo coding technology, specifically, relate to a kind of stereo encoding apparatus and coding method thereof of configurable parameter.
Background technology
In typical stereo encoding method, for example the AMR-WB+ scrambler has adopted parameter stereo coding (parameter stereo coding) technology.This parameter stereo coding (parameter stereocoding) technology is at first carried out filtering to the difference sound channel signal, and low frequency part and HFS are separated, and then low frequency part and HFS is handled respectively.Wherein low frequency part is carried out transition coding, HFS is then utilized the high frequency that goes to estimate reconstruct difference sound channel residual error with the high frequency of sound channel residual error.
Because the parameter stereo of AMR-WB+ adopts fixing wave filter that low frequency part and HFS are handled, so its structure just is restricted; And owing to resample, cause low frequency part and HFS multiple delay to occur in time domain, and make the encoding and decoding structure become very complicated, hindered new technology motion and made improvements and expand.
Summary of the invention
Technical matters solved by the invention provides a kind of stereo encoding apparatus of configurable parameter, can keep coding quality, can reduce encoder complexity again.
Technical scheme is as follows:
A kind of stereo encoding apparatus of configurable parameter comprises: pretreatment module, signal estimation module, coefficient extracting module, gain calculation module and data coding module, wherein,
Pretreatment module, receive stereo audio signal, be used for described stereo audio signal being converted to and differing from sound channel signal, the line linearity filter forecasting analysis of going forward side by side, obtain and sound channel residual signals and difference sound channel residual signals, described and sound channel residual signals are sent to described signal estimation module and coefficient extracting module with difference sound channel residual signals;
Signal estimation module, receive described and sound channel residual signals and difference sound channel residual signals, be used for obtaining differing from the estimated signal of sound channel residual error, the estimated signal of described poor sound channel residual error is sent to described coefficient extracting module by utilizing and the residual error of the residual error estimated difference sound channel of sound channel;
Coefficient extracting module, receive estimated signal described and sound channel residual signals, difference sound channel residual signals and difference sound channel residual signals, be used to carry out time-frequency conversion, the frequency coefficient that obtains behind the time-frequency conversion is carried out low frequency and high frequency extraction, send to described gain calculation module with that obtain with the high frequency coefficient sound channel residual error, difference sound channel residual error high frequency coefficient, the poor sound channel residual error low frequency coefficient that obtains is sent to described data coding module;
Gain calculation module, receive the poor sound channel residual error high frequency coefficient of high frequency coefficient, difference sound channel residual error high frequency coefficient and the estimation of described and sound channel residual error, be used to obtain the left and right acoustic channels high frequency composition of original left and right acoustic channels high frequency composition and estimation, and then the gain coefficient of left and right acoustic channels, described gain coefficient is sent to described data coding module;
Data coding module receives described poor sound channel residual error low frequency coefficient and gain coefficient, is used to carry out quantization encoding and forms encoded data stream.
Preferably, described coefficient extracting module comprises: first coefficient extracting module, second coefficient extracting module and the tertiary system are counted extraction module, wherein,
First coefficient extracting module receives and the sound channel residual signals, is used to obtain the high frequency coefficient with the sound channel residual error, sends to described gain calculation module with described with the high frequency coefficient sound channel residual error;
Second coefficient extracting module, the estimated signal of reception difference sound channel residual signals is used to obtain difference sound channel residual error high frequency coefficient, and described poor sound channel residual error high frequency coefficient is sent to gain calculation module;
The tertiary system is counted extraction module, receive difference sound channel residual signals, be used to the poor sound channel residual error high frequency coefficient that obtains estimating and differ from sound channel residual error low frequency coefficient, described poor sound channel residual error high frequency coefficient is sent to described gain calculation module, described poor sound channel residual error low frequency coefficient is sent to described data coding module.
Preferably, described signal estimation module utilizes signal estimator to obtain the estimated signal of difference sound channel residual error.
Preferably, described data coding module is used for Wiener filtering coefficient, gain coefficient, difference sound channel residual error low frequency coefficient are carried out quantization encoding, with the signal type sign formation encoded data stream of packing together.
Another technical matters solved by the invention provides a kind of stereo encoding method of configurable parameter, can keep coding quality, can reduce encoder complexity again.
Technical scheme is as follows:
A kind of stereo encoding method of configurable parameter, step comprises:
(1) pretreatment module receives stereo audio signal, described stereo audio signal is converted to and differs from sound channel signal, the line linearity filter forecasting analysis of going forward side by side, obtain and sound channel residual signals and difference sound channel residual signals, described and sound channel residual signals are sent to described signal estimation module and coefficient extracting module with difference sound channel residual signals;
(2) signal estimation module receives described and sound channel residual signals and difference sound channel residual signals, the residual error of the residual error estimated difference sound channel of utilization and sound channel, obtain the estimated signal of difference sound channel residual error, the estimated signal of described poor sound channel residual error is sent to described coefficient extracting module;
(3) coefficient extracting module receives estimated signal described and sound channel residual signals, difference sound channel residual signals and difference sound channel residual signals, carry out time-frequency conversion, the frequency coefficient that obtains behind the time-frequency conversion is carried out low frequency and high frequency extraction, send to gain calculation module with that obtain with the high frequency coefficient sound channel residual error, difference sound channel residual error high frequency coefficient, the poor sound channel residual error low frequency coefficient that obtains is sent to described data coding module;
(4) gain calculation module receives the poor sound channel residual error high frequency coefficient of high frequency coefficient, difference sound channel residual error high frequency coefficient and the estimation of described and sound channel residual error, obtain the left and right acoustic channels high frequency composition of original left and right acoustic channels high frequency composition and estimation, and then the gain coefficient of left and right acoustic channels, described gain coefficient is sent to described data coding module;
(5) data coding module receives described poor sound channel residual error low frequency coefficient and gain coefficient, carries out quantization encoding and forms encoded data stream.
Further, step (3) comprising:
(31) first coefficient extracting module receive and the sound channel residual signals, obtain the high frequency coefficient with the sound channel residual error, send to described gain calculation module with described with the high frequency coefficient sound channel residual error;
(32) second coefficient extracting module receive the estimated signal of difference sound channel residual signals, obtain difference sound channel residual error high frequency coefficient, and described poor sound channel residual error high frequency coefficient is sent to gain calculation module;
(33) tertiary system is counted extraction module and is received difference sound channel residual signals, poor sound channel residual error high frequency coefficient that obtains estimating and difference sound channel residual error low frequency coefficient, described poor sound channel residual error high frequency coefficient is sent to described gain calculation module, described poor sound channel residual error low frequency coefficient is sent to described data coding module.
Further, in the step (5), described data coding module is carried out quantization encoding to Wiener filtering coefficient, gain coefficient, difference sound channel residual error low frequency coefficient, and packing together with the signal type sign forms encoded data stream and transmission.
The present invention can keep coding quality under identical coding bit rate condition, can reduce encoder complexity again, and the function of low frequency bandwidth with the code rate flexible configuration is provided.
Compare with traditional encoder frame, it has following advantage:
(1) provide consistent encoding and decoding framework to make too complicated problems of encoding and decoding structure owing to resampling in time domain to solve AMR-WB+.
(2) can control flexibly according to coding bit rate for the low frequency bandwidth that adopts precision encoding, keep the consistance of codec framework simultaneously.Such as, when available coding bit rate is higher, can enlarge the scope of low frequency, otherwise then reduce the scope of low frequency.
(3) HFS carries out gain control and carries out in frequency domain, so improved frequency resolution.
Description of drawings
Fig. 1 is the structural representation of the stereo encoding apparatus of configurable parameter.
Embodiment
With reference to the accompanying drawings, the preferred embodiments of the present invention are described in detail.
With reference to shown in Figure 1, the stereo encoding apparatus of configurable parameter is described in detail.
The stereo encoding apparatus of configurable parameter comprises pretreatment module 11, signal estimation module 12, coefficient extracting module 13, gain calculation module 14 and data coding module 15.
The input data of pretreatment module 11 are stereo audio signal, for example left and right sound track signals.In pretreatment module 11, stereo audio signal is converted to and differs from sound channel signal, the line linearity filter forecasting analysis of going forward side by side, obtain and sound channel residual signals (residual signals 1) and difference sound channel residual signals (residual signals 2), sound channel residual signals (residual signals 1) is sent to coefficient extracting module 1, will differ from sound channel residual signals (residual signals 2) and send to coefficient extracting module 3.
Signal estimation module 12 receives and sound channel residual signals (residual signals 1) and difference sound channel residual signals (residual signals 2), go the residual error of estimated difference sound channel by the residual error of a certain class signal estimator (for example S filter) utilization and sound channel, obtain the estimated signal of difference sound channel residual error, the estimated signal of this difference sound channel residual error is sent to coefficient extracting module 13.
Coefficient extracting module 13 to carrying out time-frequency conversion with the estimated signal of sound channel residual signals, difference sound channel residual signals and difference sound channel residual signals, is carried out low, high frequency extraction with the frequency coefficient that obtains behind the time-frequency conversion according to different signal types.Coefficient extracting module 13 comprises coefficient extracting module 131 (first coefficient extracting module), coefficient extracting module 132 (second coefficient extracting module) and coefficient extracting module 3 (tertiary system is counted extraction module), wherein coefficient extracting module 131 utilizes residual signals 1 to obtain high frequency coefficient with the sound channel residual error, and the high frequency coefficient of this and sound channel residual error is sent to gain calculation module 14; Coefficient extracting module 132 utilizes the estimated signal of difference sound channel residual signals to obtain difference sound channel residual error high frequency coefficient, should differ from sound channel residual error high frequency coefficient and send to gain calculation module 14; Poor sound channel residual error high frequency coefficient and difference sound channel residual error low frequency coefficient that coefficient extracting module 133 utilizes residual signals 2 to obtain estimating, to differ from sound channel residual error high frequency coefficient and send to gain calculation module 14, difference sound channel residual error low frequency coefficient sends to data coding module 15 and carries out quantization encoding.
Residual signals is carried out time-frequency conversion, and the frequency coefficient that obtains carries out low, high frequency extraction according to formula (1), and formula is as follows:
Wherein:
E
S(k) frequency coefficient of representative difference sound channel residual error;
E
SL(k) low frequency coefficient of representative difference sound channel residual error;
E
SH(k) high frequency coefficient of representative difference sound channel residual error;
L is the cutoff frequency of coding low frequency, and L can determine to fluctuate according to coding bit rate under the frequency (such as 2kHz) one, and for example when coding bit rate was higher, L can be greatly; When coding bit rate was low, L can be smaller.M is the length of time-frequency conversion.
Equally, the poor sound channel residual error frequency coefficient with sound channel residual error frequency coefficient and estimation is carried out the high frequency extraction and obtain E
MH(k) and
The poor sound channel residual error high frequency coefficient of high frequency coefficient, difference sound channel residual error high frequency coefficient and the estimation of gain calculation module 14 receptions and sound channel residual error, obtain the left and right acoustic channels high frequency composition of original left and right acoustic channels high frequency composition and estimation, further try to achieve the gain coefficient (g of L channel
L) and the gain coefficient (g of R channel
R).
The high frequency coefficient E of utilization and sound channel residual error
MH(k), differ from sound channel residual error high frequency coefficient E
SH(k) and the poor sound channel residual error high frequency coefficient of estimating
Obtain original L channel high frequency composition E
LH(k), R channel high frequency composition E
RH(k), the L channel high frequency composition of Gu Jiing
With the R channel high frequency composition of estimating
L≤k＜M wherein, L is identical with formula (1) with M, and then by formula (2) try to achieve the gain coefficient of left and right acoustic channels.
Formula (2) is as follows:
Wherein:
*Representing complex conjugate, k
bInitial spectral line for subband b.Whole high frequency composition can be divided into a plurality of subbands, and each subband has two gain control coefficients.
15 pairs of Wiener filtering coefficients of data coding module, gain coefficient (g
LAnd g
R), difference sound channel residual error low frequency coefficient carries out quantization encoding, packing together with parameters such as signal type signs forms encoded data stream and sends.Wherein, it is carried out precision encoding to the Split multi-rate latticeVQ encoding scheme among the difference sound channel residual error low frequency coefficient employing AMR-WB+.
Claims (7)
1, a kind of stereo encoding apparatus of configurable parameter is characterized in that, comprising: pretreatment module, signal estimation module, coefficient extracting module, gain calculation module and data coding module, wherein,
Pretreatment module, receive stereo audio signal, be used for described stereo audio signal being converted to and differing from sound channel signal, the line linearity filter forecasting analysis of going forward side by side, obtain and sound channel residual signals and difference sound channel residual signals, described and sound channel residual signals are sent to described signal estimation module and coefficient extracting module with difference sound channel residual signals;
Signal estimation module, receive described and sound channel residual signals and difference sound channel residual signals, be used for obtaining differing from the estimated signal of sound channel residual error, the estimated signal of described poor sound channel residual error is sent to described coefficient extracting module by utilizing and the residual error of the residual error estimated difference sound channel of sound channel;
Coefficient extracting module, receive estimated signal described and sound channel residual signals, difference sound channel residual signals and difference sound channel residual signals, be used to carry out time-frequency conversion, the frequency coefficient that obtains behind the time-frequency conversion is carried out low frequency and high frequency extraction, send to described gain calculation module with that obtain with the high frequency coefficient sound channel residual error, difference sound channel residual error high frequency coefficient, the poor sound channel residual error low frequency coefficient that obtains is sent to described data coding module;
Gain calculation module, receive the poor sound channel residual error high frequency coefficient of high frequency coefficient, difference sound channel residual error high frequency coefficient and the estimation of described and sound channel residual error, be used to obtain the left and right acoustic channels high frequency composition of original left and right acoustic channels high frequency composition and estimation, and then the gain coefficient of left and right acoustic channels, described gain coefficient is sent to described data coding module;
Data coding module receives described poor sound channel residual error low frequency coefficient and gain coefficient, is used to carry out quantization encoding and forms encoded data stream.
2, the stereo encoding apparatus of configurable parameter according to claim 1 is characterized in that, described coefficient extracting module comprises: first coefficient extracting module, second coefficient extracting module and the tertiary system are counted extraction module, wherein,
First coefficient extracting module receives and the sound channel residual signals, is used to obtain the high frequency coefficient with the sound channel residual error, sends to described gain calculation module with described with the high frequency coefficient sound channel residual error;
Second coefficient extracting module, the estimated signal of reception difference sound channel residual signals is used to obtain difference sound channel residual error high frequency coefficient, and described poor sound channel residual error high frequency coefficient is sent to gain calculation module;
The tertiary system is counted extraction module, receive difference sound channel residual signals, be used to the poor sound channel residual error high frequency coefficient that obtains estimating and differ from sound channel residual error low frequency coefficient, described poor sound channel residual error high frequency coefficient is sent to described gain calculation module, described poor sound channel residual error low frequency coefficient is sent to described data coding module.
3, the stereo encoding apparatus of configurable parameter according to claim 1 is characterized in that, described signal estimation module utilizes signal estimator to obtain the estimated signal of difference sound channel residual error.
4, the stereo encoding apparatus of configurable parameter according to claim 1, it is characterized in that, described data coding module is used for Wiener filtering coefficient, gain coefficient, difference sound channel residual error low frequency coefficient are carried out quantization encoding, with the signal type sign formation encoded data stream of packing together.
5, a kind of stereo encoding method of configurable parameter, step comprises:
(1) pretreatment module receives stereo audio signal, described stereo audio signal is converted to and differs from sound channel signal, the line linearity filter forecasting analysis of going forward side by side, obtain and sound channel residual signals and difference sound channel residual signals, described and sound channel residual signals are sent to described signal estimation module and coefficient extracting module with difference sound channel residual signals;
(2) signal estimation module receives described and sound channel residual signals and difference sound channel residual signals, the residual error of the residual error estimated difference sound channel of utilization and sound channel, obtain the estimated signal of difference sound channel residual error, the estimated signal of described poor sound channel residual error is sent to described coefficient extracting module;
(3) coefficient extracting module receives estimated signal described and sound channel residual signals, difference sound channel residual signals and difference sound channel residual signals, carry out time-frequency conversion, the frequency coefficient that obtains behind the time-frequency conversion is carried out low frequency and high frequency extraction, send to gain calculation module with that obtain with the high frequency coefficient sound channel residual error, difference sound channel residual error high frequency coefficient, the poor sound channel residual error low frequency coefficient that obtains is sent to described data coding module;
(4) gain calculation module receives the poor sound channel residual error high frequency coefficient of high frequency coefficient, difference sound channel residual error high frequency coefficient and the estimation of described and sound channel residual error, obtain the left and right acoustic channels high frequency composition of original left and right acoustic channels high frequency composition and estimation, and then the gain coefficient of left and right acoustic channels, described gain coefficient is sent to described data coding module;
(5) data coding module receives described poor sound channel residual error low frequency coefficient and gain coefficient, carries out quantization encoding and forms encoded data stream.
6, the stereo encoding method of configurable parameter according to claim 5 is characterized in that, step (3) comprising:
(31) first coefficient extracting module receive and the sound channel residual signals, obtain the high frequency coefficient with the sound channel residual error, send to described gain calculation module with described with the high frequency coefficient sound channel residual error;
(32) second coefficient extracting module receive the estimated signal of difference sound channel residual signals, obtain difference sound channel residual error high frequency coefficient, and described poor sound channel residual error high frequency coefficient is sent to gain calculation module;
(33) tertiary system is counted extraction module and is received difference sound channel residual signals, poor sound channel residual error high frequency coefficient that obtains estimating and difference sound channel residual error low frequency coefficient, described poor sound channel residual error high frequency coefficient is sent to described gain calculation module, described poor sound channel residual error low frequency coefficient is sent to described data coding module.
7, the stereo encoding method of configurable parameter according to claim 5, it is characterized in that, in the step (5), described data coding module is carried out quantization encoding to Wiener filtering coefficient, gain coefficient, difference sound channel residual error low frequency coefficient, and packing together with the signal type sign forms encoded data stream and transmission.
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