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From: rogerc@thebox.rain.com (Roger Conley)
Newsgroups: comp.compression,alt.comp.compression
Subject: Re: Compression of 16-bit sound files.
Message-ID: <1991Apr17.140822.23647@thebox.rain.com>
Date: 17 Apr 91 14:08:22 GMT
Article-I.D.: thebox.1991Apr17.140822.23647
References: <rog.670692773@system> <1991Apr11.141742.13069@mintaka.lcs.mit.edu>
Organization: Something we don't have a lot of around here...
Lines: 6

From what I've read the standard compresion for sound files is ADPCM.
2X and 4X compresion is standard. I beleive the method uses relative 
amplitude changes instead of absolute changes since the differences
between two adjacent samples should usually be small.

I think CD's use this technique.