ADPCM encoder/decoder with improved tracking

Details ADPCM encoder/decoder with improved tracking ADPCM encoder/decoder with improved tracking

1983-11-28

1986-05-27

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 30, 332 11D, 381 31, H03M 304, H04B 1406

Patent

active

045920702

ABSTRACT:
An ADPCM encoder and decoder includes an adaptive quantizer and an adaptive predictor. A quantizing-step-size adaptation circuit determines a quantizing-step-size for the adaptive quantizer in dependence upon the ADPCM signal. When the quantizing-step-size is small, updating of predictor coefficients, produced in the adaptive predictor, in dependence upon a reconstructed signal and a reconstructed error signal derived from the ADPCM signal, is inhibited, the predictor coefficients being updated only in dependence upon a leakage function. This enables improved tracking to be achieved by the ADPCM arrangement.

REFERENCES:
patent: 3918042 (1975-11-01), Werner
patent: 4319082 (1982-03-01), Gilloire et al.
patent: 4481619 (1984-11-01), Adoul
patent: 4542516 (1985-09-01), Weirich
patent: 4549304 (1985-10-01), Weirich et al.

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