ADPCM Encoder/decoder with zero code suppression

Details ADPCM Encoder/decoder with zero code suppression ADPCM Encoder/decoder with zero code suppression

1983-11-28

1985-09-17

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 33, 340347CC, H04B 1204

Patent

active

045425167

ABSTRACT:
An ADPCM encoding/decoding arrangement produces n-bit ADPCM codes which have 2.sup.n -1 possible codes, excluding the all-zeroes code. A range of error signals about zero is quantized by the encoder as a non-zero ADPCM code. In order to avoid such non-zero codes resulting in undesired changes of predictor coefficients of an adaptive predictor of the arrangement, updating of the predictor coefficients in dependence upon a reconstructed error signal derived from the ADPCM signal is inhibited when each such non-zero code occurs.

REFERENCES:
patent: 3806806 (1974-04-01), Brolin
patent: 4467346 (1984-08-01), Mori

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