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A superframe audio track parameter smoothing and extract vector quantification method

A vector quantization and parameter smoothing technology, applied in the field of speech coding, can solve the problems of poor quantization efficiency and quantization effect, low quantization accuracy of channel parameters, poor voice quality, etc. The effect of reducing the amount of quantization operations

Inactive Publication Date: 2006-11-08
TSINGHUA UNIV
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AI Technical Summary

Problems solved by technology

For speech parameter coding at a lower bit rate, due to the small number of available bits and the lack of smooth and effective removal of random disturbances in the parameters, the quantization accuracy of the channel parameters is low, the quantization efficiency and quantization effect are poor, and the speech quality is poor.

Method used

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  • A superframe audio track parameter smoothing and extract vector quantification method
  • A superframe audio track parameter smoothing and extract vector quantification method
  • A superframe audio track parameter smoothing and extract vector quantification method

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Embodiment Construction

[0039] The method for vector quantization of superframe channel parameters proposed by the present invention is further described as follows in conjunction with accompanying drawings and embodiments:

[0040] The method process of the present invention is as figure 2 shown, including the following steps:

[0041] (1) Framing the input voice signal sample points in time order, forming a superframe with several consecutive frames;

[0042] (2) extracting channel A parameter to each frame in the current superframe;

[0043] (3) converting each frame channel A parameter in the current superframe into a line spectrum pair parameter;

[0044] (4) smoothing in the time direction by performing low-frequency filtering on the parameters of the current superframe line spectrum;

[0045] (5) Extract unvoiced sound parameters for each frame in the current superframe;

[0046] (6) carry out vector quantization to the unvoiced sound parameter of current superframe, obtain the unvoiced s...

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Abstract

This invention relates to superframe track parameter quantifying method, which comprises the following steps: to frame the input voice signal sample as time sequence; to extract each frame voice track A parameter from the current superframe and then to convert it into line spectrum parameter for flatness; to extract unvoiced and voiced syllables parameters from the current super frame for vector quantifying; to minus direct current from the important frame line spectrum and to minus prediction values from the important frame off-direct current spectrum parameters; to use the importable frame line spectrum to get non-importable quantified line spectrum parameters; to convert the quantified parameters into voice track A parameters.

Description

technical field [0001] The invention belongs to the technical field of speech coding, and in particular relates to the technology of multi-frame joint processing of speech coding with low code rate parameters. Background technique [0002] Speech coding is widely used in communication systems, voice storage and playback systems, and consumer products with voice functions. In recent years, the International Telecommunication Union (ITU), some regional organizations and some countries have successively formulated a series of speech compression coding standards, and obtained satisfactory speech quality at the coding rate of 1.2kb / s to 16kb / s. At present, domestic and foreign research mainly focuses on high-quality voice compression coding at a rate below 1.2kb / s, which is mainly used for wireless communication, secure communication, and large-capacity voice storage and playback. Because the coding rate is too low, it is necessary to adopt the parametric speech coding technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00H03M7/30G10L19/038
Inventor 崔慧娟唐昆赵永刚赵铭
Owner TSINGHUA UNIV
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