Apparatus and methods for coding, decoding, analyzing and synthe

Details Apparatus and methods for coding, decoding, analyzing and synthe Apparatus and methods for coding, decoding, analyzing and synthe

1983-07-26

1987-06-09

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 31, 381 36, G01L 500

Patent

active

046726705

ABSTRACT:
In an ADPCM (Adaptive Differential PCM) system, in which the signal is commonly coded in C.sub.i, Q.sub.n, and .sigma. parameters, a lower sampling rate which normally causes distortion is made possible by deriving additional parameters A.sub.k, B.sub.k as a function of the error (distortion) between the original signal S.sub.n and the sampled signal Y.sub.n. The A.sub.k, B.sub.k coefficients control a distortion filter at the receiver.

REFERENCES:
patent: 3750024 (1973-07-01), Dunn et al.
patent: 4047108 (1977-04-01), Bijker et al.
patent: 4538234 (1985-08-01), Honda et al.
Digital Processing of Speech Signals, by Lawrence R. Rabiner and Ronald W. Schafter, copyright 1978 by Bell Laboratories, Inc., published by Prentice-Hall, Inc., Englewood Cliffs, N.J., pp. 208-213, 226-228 and 239.

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