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Joint optimization method for multi-vector and multi-code book size based on super frame mode

A technology of codebook size and super frame, which is applied in the field of speech coding and can solve the problem of low coding rate

Inactive Publication Date: 2008-09-10
TSINGHUA UNIV
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Problems solved by technology

Because the coding rate is too low, it is necessary to adopt the parametric speech coding technology of multi-frame joint (ie super-frame) processing

Method used

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  • Joint optimization method for multi-vector and multi-code book size based on super frame mode
  • Joint optimization method for multi-vector and multi-code book size based on super frame mode
  • Joint optimization method for multi-vector and multi-code book size based on super frame mode

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Embodiment Construction

[0019] The multi-vector multi-codebook size joint optimization method based on the superframe mode proposed by the present invention is further described as follows in conjunction with the accompanying drawings and embodiments:

[0020] The method process of the present invention is as figure 2 shown, including the following steps:

[0021] Step (1) according to the number of bits n assigned to the vector quantization of the band-pass unvoiced and voiced sound parameters in the speech coding algorithm b Determine the size M of the quantized codebook, M = 2 n b , At the same time, the quantized codebook of band-pass unvoiced sound parameters is obtained by training with simulated annealing algorithm;

[0022] Step (2) according to the code book of band-pass unvoiced sound vector quantization, encoding mode is divided into M kinds of superframe modes;

[0023] Step (3) en...

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Abstract

The invention provides a combined optimizing method for the sizes of the multiple vector and multiple codebooks on the basis of a superframe mode. The invention belongs to the technical field of the compressed encoding of sound and is characterized in that: the method firstly train the quantified codebook according to the quantified bit number distributed by bandpass surd and sonant parameters, and define the superframe mode according to the quantified codebook; jointly allocate the codebook sizes of the three under each superframe mode according to quantified bit numbers distributed by the keynote cycle parameters, line spectrum frequency parameters and the short-time frame energy parameters; train the corresponding quantified codebook according to the codebook sizes of each parameter under different superframe modes, then carry out vector quantification to the three parameter vectors. The method can improve the quantification accuracy of the parameters, reduce the error of the synthesized speech and enhance sound articulation and is most suitable for the encoding of low-rate speech.

Description

technical field [0001] The multi-vector and multi-codebook size joint optimization method based on a superframe mode belongs to the technical field of speech coding, and in particular relates to the quantization technology of speech coding parameters. Background technique [0002] Speech coding is widely used in communication systems, voice storage and playback systems, and consumer products with voice functions. At present, research at home and abroad is mainly focused on high-quality voice compression coding at a rate below 1.2kb / s, which is mainly used for wireless communication, secure communication, large-capacity voice storage and playback, and IP telephony. High-quality low-rate speech coding technology is one of the important research topics in the field of speech signal processing. Because the coding rate is too low, it is necessary to adopt the parametric speech coding technology of multi-frame joint (ie, super frame) processing. In the ultra-low rate speech codi...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/038
Inventor 崔慧娟唐昆许明李晔
Owner TSINGHUA UNIV
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