Adpcm encoding and decoding circuits

Abstract From the Canadian patent

In an ADPCM encoding and decoding system comprising an encoder having an adaptive predictor and an adaptive quantizer and a decoder having an adaptive predictor and an inverse adaptive quantizer, the adaptive predictors each comprise: an adaptive-zero predictor of an arbitrary order and an adaptive-pole predictor of an arbitrary order for, input signals with time-varying frequency components; a fixed-pole predictor of an arbitrary order. for input signals the frequency composition of which remains substantially invariant over time; and an offset predictor for rejecting an offset component of the input signals these elements being connected in series. The adaptive-zero and adaptive-pole …