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Quantization coding method and quantization coding device of prediction residual signal

A technology of prediction residual and quantization coding, applied in the field of signal processing, can solve problems such as limitations, and achieve the effect of good reconstruction quality

Active Publication Date: 2011-11-16
HONOR DEVICE CO LTD
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AI Technical Summary

Problems solved by technology

This approach somewhat limits the ability of prediction-based stereo encoders to improve reconstruction quality by quantizing the residual signal

Method used

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  • Quantization coding method and quantization coding device of prediction residual signal

Examples

Experimental program
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Effect test

example 1

[0025] see Figure 4 , is a schematic diagram of Quantization Coding Example 1 of the prediction residual signal according to the embodiment of the present invention. The implementation process is described as follows:

[0026] (1) Downmix the left channel signal L and the right channel signal R to obtain two signals, namely the mono signal M and the sideband signal S:

[0027] M=(L+R) / 2; S=(L-R) / 2

[0028] (2) The mono signal M is decoded locally after passing through the mono encoder, and the decoded M signal is transformed into the frequency domain through MDCT (Modified Discrete Cosine Transform, improved discrete cosine transform); the sideband signal S is passed through the delay Afterwards, the MDCT transformation to the frequency domain is also carried out.

[0029] (3) Calculate the channel level difference of the left and right channel signals in the frequency domain according to the signal M and the signal S, specifically including the following substeps:

[003...

example 2

[0059] see Figure 5 , is a schematic diagram of Example 2 of quantization coding of the predicted residual signal according to the embodiment of the present invention. The main difference from Example 1 is that one of the two signals in Example 2 is a monophonic signal M, and the other is one of the left and right channel signals. In Example 2, the left channel signal L is taken as an example. The main process of its implementation is introduced as follows:

[0060] (1) The left channel signal L and the right channel signal R are mixed down to obtain a mono signal M: M=(L+R) / 2;

[0061] Determine the two signals as the signal M and the left channel signal L.

[0062] (2) The mono signal M is decoded locally after passing through the mono encoder, and the decoded M signal is transformed into the frequency domain through MDCT; after the left channel signal L is delayed, it is also transformed into the frequency domain through MDCT.

[0063] (3) Calculate the channel level di...

example 3

[0091] see Image 6 , is a schematic diagram of example 3 of quantization coding of the prediction residual signal according to the embodiment of the present invention, and its implementation process is introduced as follows:

[0092] (1) Downmix the left channel signal L and the right channel signal R to obtain two signals, namely the mono signal M and the sideband signal S:

[0093] M=(L+R) / 2; S=(L-R) / 2

[0094] (2) The mono signal M is decoded locally after passing through the mono encoder, and the decoded M signal is transformed into the frequency domain through MDCT; after the sideband signal S is delayed, it is also transformed into the frequency domain through MDCT.

[0095] (3) Using the frequency domain correlation prediction algorithm to obtain the prediction residual signal.

[0096] In this step, any frequency-domain correlation prediction algorithm can be used for calculation, and details will not be repeated here.

[0097] (4) Calculate the correlation value o...

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Abstract

The invention discloses a quantization coding method and a quantization coding device of a prediction residual signal. The method comprises the following steps of: acquiring two paths of signals according to left and right sound channel signals, respectively converting the two paths of signals to a frequency domain, and carrying out prediction residual coding by using the two paths of signals of the frequency domain to obtain the prediction residual signal; calculating characteristic parameters of the left and right sound channel signals in the frequency domain according to the two paths of signals; and comparing the characteristic parameters with set threshold values, selecting different quantization algorithms according to a comparison result, and carrying out quantization coding on theprediction residual signal. By the embodiment of the invention, a reconstructed stereo signal can provide better balance between the stability of a sound field and an expanded spectral range, and better stereo reconstruction quality is obtained.

Description

technical field [0001] The present invention relates to the technical field of signal processing, in particular to a method and device for quantization and encoding of a prediction residual signal. Background technique [0002] In various stereo encoders using inter-channel prediction algorithms, in order to enhance the stereo sound field effect, it is often necessary to quantize and encode the prediction residual signal, wherein, in order to achieve the scalability of the stereo encoder, the prediction residual signal Quantization coding is generally performed in the enhancement layer. [0003] see figure 1 , is a schematic diagram of the quantization coding of the prediction residual signal in the prior art. Wherein, L represents the left channel signal, and R represents the right channel signal. First, the mono signal (mono) M and the sideband signal S are obtained by down-mixing the left and right channel signals. Specifically, M=(L+ R) / 2, S=(L-R) / 2; Predict the sideb...

Claims

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Application Information

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IPC IPC(8): G10L19/04G10L19/08H04S1/00H04S5/00G10L19/032
Inventor 郎玥吴文海苗磊
Owner HONOR DEVICE CO LTD
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