Speech coding/decoding system with reduced quantization noise

Details Speech coding/decoding system with reduced quantization noise Speech coding/decoding system with reduced quantization noise

1989-12-15

1992-05-12

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 30, G10L 500

Patent

active

051134489

ABSTRACT:
An input speech signal is encoded by an adaptive quantizer device (16). The adaptive quantizer device quantizes the predicted residual signal produced by removing correlations from the digital input signal by predictors devices (6, 10). A coefficient or weighting factor, called a leakage, at the predictor device (6) is adaptively adjusted by a leakage selector device (47) depending upon a prediction gain. The prediction gain indicates the accuracy of the prediction. The value of leakage is in the range between 0 and 1, depending upon whether the speech signal is voiced sound or unvoiced sound.

REFERENCES:
patent: 4757517 (1988-07-01), Yatsuzuka
patent: 4797925 (1989-01-01), Lin
patent: 4811396 (1989-03-01), Yatsuzura
Ramamoorthy et al., "Enhancement of ADPCM Speech by Adaptive Postfiltering", AT&T Bell Lab. Tech. Jour., vol. 63, No. 8, Oct. 1984 pp. 1465-1475.
Adaptive Postfiltering of 16/kbs-ADPCM Speech, Jayant et al., IEEE ICASSP 86, pp. 829-832.
"Linear Predictive Coding of Speech: Review and Current Directions", Manfred R. Schroeder, IEEE Communications Magazine, Aug. 1985, vol. 23, No. 8, pp. 54-61.

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