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Anti channel error code method of line spectrum pair parameter of voice coder

A technology of instrument line spectrum and line spectrum pair, which is applied in the direction of instruments, speech analysis, speech synthesis, etc., and can solve the problems of not taking into account the information of the correct received bits of the current frame, correlation reduction, delay effect, etc.

Inactive Publication Date: 2007-07-25
TSINGHUA UNIV
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Problems solved by technology

The traditional algorithm will bring three problems: 1) The information of the current frame is completely lost, and the information of the correct received bits of the current frame is not considered; 2) In a low-rate vocoder, a multi-frame joint superframe is usually used Extraction and quantization, the correlation between frames is greatly reduced, and direct replacement will cause voice quality degradation, obvious transition distortion and delay effects; 3) Error frames will be generated under high bit error rates and used to continuously replace subsequent Frame parameters, resulting in serious degradation of synthesized speech quality

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  • Anti channel error code method of line spectrum pair parameter of voice coder
  • Anti channel error code method of line spectrum pair parameter of voice coder
  • Anti channel error code method of line spectrum pair parameter of voice coder

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[0017] The vocoder line spectrum pair parameter anti-channel bit error method proposed by the present invention is further described as follows in conjunction with the accompanying drawings and embodiments:

[0018] Method flow process of the present invention as shown in Figure 1, comprises the following steps:

[0019] (1) Frame the input voice signal sample point according to the set time sequence, the voice signal sample point is the signal sample point that has been sampled according to the set frequency and removed the power frequency interference through high-pass filtering;

[0020] (2) According to the linear predictive speech coding algorithm of 2400b / s mixed excitation, extract the vocoder line spectrum pair parameters for the current frame: when multi-frame joint vector quantization, it is necessary to extract the vocoder lines of all frames in the current superframe Spectrum pair parameters; vector quantize the extracted line spectrum pair parameters, and perform ...

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Abstract

A parameter channel error code resisting method of vocoder line spectrum includes carrying out odd-even calibration on parameter and writing calibration bit into most non-important parameter bit of vocoder at coding end, picking light voiced sound parameters and integrating said parameters with maximum post verification probability algorithm to carry out recovery estimation for raising parameter recovery accuracy by line spectrum then picking line spectrum to make relevant odd-even calibration on parameters at decoding end.

Description

technical field [0001] The invention belongs to the technical field of speech coding, in particular to the speech coding anti-channel error technology. Background technique [0002] Vocoders are widely used in wireless communication, secure communication, voice storage and playback systems, and consumer products with voice functions. However, low-rate speech coding increases the amount of information carried by each speech parameter, and channel bit errors have a great impact on the quality of reconstructed speech in harsh conditions or in harsh high-error-rate narrowband wireless channel environments. The intelligibility, naturalness and comfort of speech reconstructed by the low-rate vocoder affected by the high bit error rate will be greatly reduced. However, the special requirements of low-rate voice transmission do not allow additional bandwidth consumption and large codec delay, which is in contradiction with traditional channel coding that requires additional bandwid...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/08G10L19/14G10L11/06G10L13/00G10L19/038G10L19/18
Inventor 唐昆崔慧娟彭坦李晔
Owner TSINGHUA UNIV
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