Vector quantization in celp speech coder

Details Vector quantization in celp speech coder Vector quantization in celp speech coder

1998-02-27

2000-04-25

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704230, 704219, G10L 914

Patent

active

060554967

ABSTRACT:
A process for generation of codevectors in the production of synthetic speech in a communication system employing code-excited linear prediction (CELP) is implemented by dividing frames of sampled speech into sub-frames for which are generated codevectors suitable for excitation of synthesizer filters in the low-bit mode of signal transmission. Vector quantization (VQ) is employed with an algebraic representation of the CELP. A reduction of a sub-frame of 6.7 milliseconds to a vector representation of only 8 pulses results in an insufficiency of candidate codevectors, which insufficiency is overcome by a circular shifting of the codevectors at a cyclical rate equal to the pitch of the original voice signal.

REFERENCES:
patent: 5371853 (1994-12-01), Kao et al.
patent: 5710863 (1998-01-01), Chen
patent: 5774839 (1998-06-01), Shlomot
patent: 5903866 (1999-05-01), Shoiam

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