A 600bps Very Low Rate Speech Coding and Decoding Method Based on Hybrid Excitation Linear Prediction

A codec method and linear prediction technology, applied in the field of voice communication, can solve problems such as increasing system capacity, achieve the effect of reducing output bit rate, good application prospect and practical value, and low complexity

Active Publication Date: 2019-07-19
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

(2) Increase system capacity

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  • A 600bps Very Low Rate Speech Coding and Decoding Method Based on Hybrid Excitation Linear Prediction
  • A 600bps Very Low Rate Speech Coding and Decoding Method Based on Hybrid Excitation Linear Prediction
  • A 600bps Very Low Rate Speech Coding and Decoding Method Based on Hybrid Excitation Linear Prediction

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Embodiment Construction

[0041] Below in conjunction with accompanying drawing, the present invention will be further described:

[0042] At the encoding end, after preprocessing the input voice signal such as denoising, adding a window and truncating to form a 20ms subframe, five subframes form a superframe; jointly quantify the voice feature parameters of the five subframes, and use the frame structure The remaining bits in the error control code some important speech feature parameters, and finally form a binary bit stream for transmission. At the decoding end, the speech feature parameters are analyzed from the received bit stream, and the speech feature parameters analyzed are used to generate an excitation signal, and the reconstructed speech is obtained after passing through a synthesis filter. After gain adjustment and pulse shaping filtering, the final synthesized speech is obtained.

[0043] The speech parameters for extracting subframes include: line spectrum pair frequency (LSF), pitch pe...

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Abstract

The invention provides a 600bps extremely low rate speech codec method based on hybrid excited linear prediction. The method comprises the steps that an encode end carries out windowing truncation on an input speech signal to acquire a sub-frame; speech characteristic parameters of the sub-frame are extracted, wherein line spectrum pair frequency, pitch period, gain and band-pass clear / voiced intensity; a super-frame is formed by five adjacent sub-frames, and the type of the super-frame is determined; multi-frame joint quantization encoding is carried out on the speech characteristic parameters; remaining bits after multi-frame joint quantization encoding are used to carry out error control on important speech characteristic parameters; and finally binary bit stream is formed for transmission. After a decode end analyzes the super-frame type and the speech characteristic parameters, the speech characteristic parameters integrity is reconstructed to generate an excitation signal. A synthesis speech signal is acquired through self-adaptive spectrum enhancement, a synthesis filter, gain control and pulse dispersion filtering. According to the invention, the speech encoding rate can be effectively reduced; speech synthesized by a receiving end has high definition and intelligibility; and the complexity of the algorithm is low.

Description

technical field [0001] The invention belongs to the field of voice communication, and in particular relates to a very low rate voice codec based on mixed excitation linear prediction, which can be applied in secure communication, satellite mobile communication and deep sea communication. Background technique [0002] Voice is the main carrier for human beings to transmit information to each other. It is the most direct, convenient and effective way of communication in modern communication, and it is also the main means of human-computer interaction in the future. With the development of communication technology, the proportion of non-voice information such as images and data in information transmission is increasing, but effective voice information transmission is still one of the necessary functions of many communication systems. [0003] Although the introduction of optical fiber transmission technology provides a huge transmission capacity for communication networks, the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/087
CPCG10L19/087
Inventor 李强朱兰陈浩张玲明艳
Owner CHONGQING UNIV OF POSTS & TELECOMM
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