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
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[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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