Method of and device for speech signal coding and decoding by ve

Details Method of and device for speech signal coding and decoding by ve Method of and device for speech signal coding and decoding by ve

1985-09-20

1988-12-13

Salce, Patrick R.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 43, 381 51, 3645135, G10L 500

Patent

active

047916702

ABSTRACT:
This method provides a filtering of digital samples of speech signal by a linear-prediction inverse filter, whose coefficients are chosen out of a codebook of quantized filter coefficient vectors, obtaining a residual signal subdivided into vectors. The weighted mean-square error made in quantizing said vectors with quantized residual vectors contained in a codebook and forming excitation waveforms is computed.
The coding signal for each block of samples consists of the coefficient vector index chosen for the inverse filter as well as of the indices of the vectors of the excitation waveforms which have generated minimum weighted mean-square error. During the decoding phase, a synthesis filter, having the same coefficients as chosen for the inverse filter, is excited by quantized-residual vectors chosen during the coding phase (FIGS. 1, 2).

REFERENCES:
patent: 4670851 (1987-06-01), Murakami et al.
"Distortion Performance of Vector Quantization for LPC Voice Coding", Biing-Hwang Juang et al-pp. 294-303.
"A New Model of LPC Excitation for Producing Natural-Sounding Speech at Low Bit Rates", B. S. Atal et al, pp. 614-617.
IEEE Transactions on Communications, vol. Com. 30, No. 4, Apr. 1982, A Multirate Voice Digitizer Based upon Vector Quantization by Guillermo Rebolledo, Member IEEE et al. pp. 721-727.

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