Apparatus for encoding and apparatus for decoding speech and musical signals

Abstract From the Canadian patent

A speech and musical signal codec employing a band splitting technique encodes sound source signals of each of a plurality of bands using a small number of bits. The codec includes a second pulse position generating circuit to which an index output by a minimizing circuit and a first pulse position vector P-= (P1, P2 ... P M) are, input, for revising the first pulse position vector using a pulse position revision quantity d- i = (d i1 d i2, ... d iM) specified by the index and outputting the revised vector to a second sound source generating circuit as a second pulse position vector P- t = (P1+d i1 P2+d i2, ... P M+d iM).