COMPRESSION OF HIGH-QUALITY AUDIO SIGNALS, INCLUDING RECENT METHODS USING WAVELET PACKETS

Reasons for the importance of compression of high-quality audio are ad vanced. Audio signal analog-to-digital conversion is summarized. Human perception and auditory modeling are briefly discussed. Signal quanti zation and block processing are concisely presented. Adaptive transfor m coding, subband coding, and time domain aliasing cancellation are su ccinctly reviewed. Advanced physical modeling compression methods, per ceptually based algorithms, and MUSICAM are compactly described. Sever al recent proposals are discussed, and the most promising and effectiv e of these, based on adaptive wavelet packets, is described. Performan ces of many of the techniques are given to provide comparisons. Resear ch directions to enable improvement of the present state of the art ar e provided. It is to be noted that approaches employing adapted wavele t packets show particularly outstanding promise. (C) 1996 Academic Pre ss, Inc.