Adpcm encoder/decoder with improved tracking

Details Adpcm encoder/decoder with improved tracking Adpcm encoder/decoder with improved tracking

H - Electricity

03

M

354/47, 354/68

H03M 3/04 (2006.01) H03M 13/00 (2006.01)

Patent

CA 1208789

ADPCM ENCODER/DECODER WITH IMPROVED TRACKING Abstract of the Disclosure 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. -i-

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