Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1984-11-28
1989-03-07
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 38, 381 47, G10L 302
Patent
active
048113964
ABSTRACT:
A speech signal coding system comprises a prediction filter coupled with an output of a quantizer for prediction of a signal. A subtractor provides the difference between an input signal and an output of the prediction filter. A quantizer quantizes the residual signal, which is the difference provided by the subtractor. The quantizer is improved by adaptively adjusting step size for quantization. Thus, the coded outputs, according to the present invention, are the parameter information of the prediction filter, quantized output of the residual signal, and step information for quantization. The quantization step is determined according to the fundamental step size which provides the statistical variance, equal to one, to the quantized signal, and/or the power of the residual signal. Because of an efficient encoding with an adaptive control of the quantization step, the bandwidth for transmission of the coded signal in a communication system or transmission rate of coded speech signal is minimized. Excellent speech is reproduced through a narrow band channel, or low bit rate digital channel like 16 kbits/second digital channel.
REFERENCES:
patent: 3715512 (1973-02-01), Kelly
patent: 3973081 (1976-08-01), Hutchins
patent: 4133976 (1979-01-01), Atal et al.
patent: 4475227 (1984-10-01), Belfield
patent: 4677671 (1987-06-01), Galand et al.
Y. Yatsuzuka et al., "Application of 32 and 16 kb/s Speech Encoding Techniques to Digital satellite Communications", International Journal of Satellite Communication, vol. 1 (1983) pp. 113-114.
Study on Voice Coding Techniques applicable to the Inmarsat system, Oct. 1982, Kokusai Denshin Denwa Co. Ltd. (Research & Development Denwa Co. Ltd).
Kemeny Emanuel S.
Knepper David D.
Kokusai Denshin Denwa Co. Ltd.
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