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Super frame track parameter vector quantizing method

A technology of vector quantization and parameter vector, applied in the field of speech coding, which can solve problems such as low prediction efficiency and poor quantization effect of channel parameters

Inactive Publication Date: 2005-05-11
TSINGHUA UNIV
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Problems solved by technology

This is one of the main reasons why the quantization effect of channel parameters is not good for the lower bit rate parameter speech coding that adopts super frame processing, and the prediction efficiency is very low.

Method used

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  • Super frame track parameter vector quantizing method
  • Super frame track parameter vector quantizing method
  • Super frame track parameter vector quantizing method

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Embodiment Construction

[0029] 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:

[0030] The method process of the present invention is as figure 2 shown, including the following steps:

[0031] (1) Framing the input voice signal sample points in time order, forming a superframe with several consecutive frames;

[0032] (2) extracting channel A parameter to each frame in the current superframe;

[0033] (3) converting each frame channel A parameter in the current superframe into a line spectrum pair parameter;

[0034] (4) Extract unvoiced sound parameters for each frame in the current superframe;

[0035] (5) carry out vector quantization to the unvoiced sound parameter of current superframe, obtain the unvoiced sound parameter quantization value after current superframe quantization;

[0036] (6) Determine the current superframe mode according to the u...

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Abstract

A vector quantization method includes framing inputted voice signal sample point to form a super frame, picking up A sound channel parameter as well as voiceless and voiced consonant parameter for quantization, converting A sound channel parameter to be line spectrum pair parameter, deducting DC subcomponent, confirming line spectrum pair predictive value, using line spectrum pair parameter without DC to detuct the prodictive value for carrying out vector quantization.

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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IPC IPC(8): G10L19/038
Inventor 崔慧娟唐昆赵永刚李军林
Owner TSINGHUA UNIV
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