ADAPTIVE POSTFILTER IN 16KBPS LD-CELP SPEECH CODER

摘要

In September 1992,the recommendation G 728, which is a 16kbps LD-CELP speech coder submitted by AT&T.was standarized by CCITT.In the process of ratification test(1].the coder's performances were equivalent to or better than that of 32kbps ADPCM for all conditions tested.This paper which is based on a G.728 encoding-decoding system simulated in software, studies and tests different parts of the algorithm, espacially that of the postfitter.