Adaptive digital filter

摘要: An adaptive digital filter which is used, for instance, a prediction in an ADPCM modulator and demodulator, providing stable operation minimum phase shift response. The (FIG. 4, FIG. 5) has three parallel branches (A,B,C), two (A,B) of them have plurality series connected non-recursive elements (A1 -An, B1 -Bn) each degree not larger than relating to operator (Z-1), third branch (C) merely conductive line. Tap coefficients (c1, c2, . ., d1, d2, ) change according solutions the transfer filter. A numerator and/or denominator function present Chebychev polynominal zero point pole. (wi, vi) locate alternately on unit circle 6) Z-1 plane. When do said circle, tap , are updated, since non-alternate assure response