Apparatus and methods for coding, decoding, analyzing and synthesizing a signal
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United States of America Patent
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Jun 9, 1987
Grant Date -
N/A
app pub date -
Jul 26, 1983
filing date -
Jul 26, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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