Adpcm encoder/decoder with zero code suppression

Details Adpcm encoder/decoder with zero code suppression Adpcm encoder/decoder with zero code suppression

H - Electricity

04

B

354/68

H04B 14/06 (2006.01) G06T 9/00 (2006.01)

Patent

CA 1205917

ADPCM ENCODER/DECODER WITH ZERO CODE SUPPRESSION Abstract of the Disclosure An ADPCM encoding/decoding arrangement produces n-bit ADPCM codes which have 2n-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 arrangements 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.

442024

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