Voice signal transmission system using spectral parameter and vo

Details Voice signal transmission system using spectral parameter and vo Voice signal transmission system using spectral parameter and vo

1996-01-16

1998-03-31

Ghebretinsae, Temesghen

Pulse or digital communications

Pulse code modulation

Differential

375240, 395 231, 395 239, H04B 1406

Patent

active

057346798

ABSTRACT:
The invention provides a voice signal transmission system which reduces the amount of increase in calculation while suppressing possible deterioration of the performance by an expansion in the distribution of a voice parameter representative of an envelope of a voisce pectrum when input voice having a plurality of frequency characteristics is treated simultaneously. Discrimination circuit 5 discriminates, based on a voice parameter extracted by spectrum parameter extraction circuit 2, another voice parameter obtained by quantization of the extracted voice parameter by first quantization circuit 3 and a further voice parameter obtained by quantization of the extracted audio parameter by second quantization circuit 4, which one of either third quantization circuit 6 designed corresponding to first quantization circuit 3 or fourth quantization circuit 7 designed corresponding to second quantization circuit 4 should be used. Then, in accordance with a result of the discrimination, third quantization circuit 6 or fourth quantization circuit 7 quantizes a quantization error of corresponding first quantization circuit 3 or second quantization circuit 4 as an error vector. On the reception side, the error vector is dequantized in accordance with the discrimination.

REFERENCES:
patent: 5271089 (1993-12-01), Ozawa
patent: 5487128 (1996-01-01), Ozawa
Furui, S., "Digital Voice Processing", Tokai University Press Association, pp. 89-94 (with translation), Version 1, Sep. 25, 1985.
Gersho, A. and Gray, R.M., "Vector Quantization and Signal Compression", Kluwer Academic Publishers, 1991, pp. 309-316.

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