Multi-mode multi-stage codebook joint optimization method

A joint optimization and multi-mode technology, applied in speech analysis, instruments, etc., can solve the problem of large influence of system distortion, achieve the effect of reducing system distortion, weakening influence and improving quality

Active Publication Date: 2015-07-22
TSINGHUA UNIV +1
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Problems solved by technology

[0006] The purpose of the present invention is to provide a multi-mode multi-level codebook joint optimization method to solve the te

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  • Multi-mode multi-stage codebook joint optimization method
  • Multi-mode multi-stage codebook joint optimization method
  • Multi-mode multi-stage codebook joint optimization method

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[0032] The implementation of the present invention will be described in detail below with reference to the accompanying drawings and embodiments, so as to fully understand how the present invention applies technical means to solve technical problems and achieve the realization process of technical effects and implement them accordingly. It should be noted that, as long as there is no conflict, each embodiment of the present invention and each feature in each embodiment can be combined with each other, and the technical solutions formed are all within the protection scope of the present invention.

[0033] The embodiment of the present invention provides a multi-mode and multi-level codebook joint optimization method, which can be applied to low-rate speech coding. Such as figure 1 As shown, the method includes:

[0034] S1: Output the vector to be quantized.

[0035] Specifically, in low-rate speech coding, the quantization index of the speech library according to the sub-modes and...

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Abstract

The invention discloses a multi-mode multi-stage codebook joint optimization method, belongs to the technical field of low-bitrate speech coding vector quantization and solves the technical problem that in existing multi-mode multi-stage codebook training, error codes greatly influence the systematic distortion. The multi-mode multi-stage codebook joint optimization method includes: outputting the vectors to be quantified; conducting training on the vectors to be quantified and obtaining the multi-mode multi-stage initial codebooks; conducting the codebook index rearrangement on each multi-mode multi-stage initial codebook and obtaining a new codebook; regarding the vectors to be quantified, seeking the optimal cell and the quantified index which enable the systematic distortion to be smallest through the new codebook; updating the multi-mode multi-stage optimal codon through the input of the residual vectors and the corresponding quantified indexes and iterating the optimal codon to the preset times; and obtaining the codon obtained from the last iteration.

Description

technical field [0001] The invention relates to the technical field of low-rate speech coding vector quantization, in particular to a multi-mode and multi-level codebook joint optimization method. Background technique [0002] With the development of audio technology, low-rate speech coding has been widely used in wireless communication, satellite communication and other fields. [0003] In low-rate speech coding, due to the limitation of the amount of storage and calculation, the restricted vector quantization methods are often used, including tree vector quantization, classification vector quantization, multi-level vector quantization, transform domain vector quantization, etc., to reduce The amount of storage and computation of the codebook. Among them, multi-level vector quantization is the most commonly used. On the other hand, although the sub-mode vector quantization will increase a certain storage capacity, it can effectively reduce the quantization error without a...

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Application Information

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IPC IPC(8): G10L19/038G10L19/107
Inventor 徐敬德崔慧娟唐昆
Owner TSINGHUA UNIV
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