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Coding and decoding method for voice frequency signals and coding and decoding device

An audio signal and coding method technology, applied in the field of signal processing, can solve the problem of waste of coding and decoding resources, etc.

Inactive Publication Date: 2009-09-02
HUAWEI TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

However, in most cases, the audio signal is relatively stable, and its time-domain envelope information is also relatively stable. Therefore, if a high time resolution is still used, additional codec resources will be wasted

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  • Coding and decoding method for voice frequency signals and coding and decoding device
  • Coding and decoding method for voice frequency signals and coding and decoding device
  • Coding and decoding method for voice frequency signals and coding and decoding device

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Embodiment Construction

[0042] The specific implementation manners of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0043] An audio signal encoding method disclosed in an embodiment of the present invention is: according to the stability degree of the audio signal, extracting time-domain envelope information corresponding to the degree of stability from the audio signal, for example, for the degree of stability of the audio signal For a higher signal, a lower time resolution can be used to extract a smaller number of time-domain envelope information; for an unstable audio signal (such as a transient signal), a higher time resolution can be used to extract a smaller number of Multi-number time-domain envelope information to eliminate the adverse effects of transient signals. Then, the extracted time-domain envelope information is quantized and coded to obtain codewords of the time-domain envelope. And the quantizati...

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Abstract

The embodiment of the invention discloses a coding method for voice frequency signals, which includes the steps of: obtaining the stability parameter of a current frame voice frequency signal and extracting time domain envelope information with the corresponding number from the current frame voice frequency signal according to the stability parameter of the signal; carrying out quantization coding on the extracted time domain envelope information and obtaining the coding code word of the time domain envelope; obtaining the quantization value of the time domain envelope information and utilizing the quantization value to carry out normalization processing on the current frame voice frequency signal; and carrying out transformation coding on the current frame voice frequency signal after normalization processing and a previous frame voice frequency signal. Besides, the invention also discloses a decoding method for voice frequency signals and a coding and decoding device. While getting rid of noise leakage problem caused by a transient signal, the invention also saves the resource of coding and decoding.

Description

technical field [0001] The present invention relates to signal processing technology, in particular to an audio signal encoding and decoding method and device. Background technique [0002] In the coding and decoding of signals such as wideband or ultra-wideband speech and music (collectively referred to as "audio signals"), the transform domain coding based on MDCT (Modified Discrete Cosine Transform) is widely used. The main method is Transform the audio signal of a certain length into the transform domain, and then quantize and encode the coefficients in the transform domain according to a specific quantization strategy. However, the signal obtained by MDCT often has a pre-echo (pre-echo) effect due to the sudden transition of the signal from a relatively small energy to a large energy, that is, the quantization error of the frame with a larger energy in the next frame passes through the MDCT at the decoding end. The overlap-add leaks into previous frames with relatively...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/02G10L19/14H04B1/66G10L19/022
CPCG10L19/022
Inventor 张德明张琦
Owner HUAWEI TECH CO LTD
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