Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!columbia!cunixc!cunixa.cc.columbia.edu!garton From: garton@cunixa.cc.columbia.edu (Bradford Garton) Newsgroups: comp.dsp Subject: sound data compression Message-ID: <1900@cunixc.cc.columbia.edu> Date: 24 Sep 89 14:14:02 GMT References: <6028@jpl-devvax.JPL.NASA.GOV> <89255.105143P85025@BARILVM.BITNET><7767@microsoft.UUCP> <89264.171306P85025@BARILVM.BITNET> <8909@batcomputer.tn.cornell.edu> <7814@microsoft.UUCP> Sender: news@cunixc.cc.columbia.edu Reply-To: brad@woof.columbia.edu (Brad Garton) Organization: Columbia University Electronic Music Center Lines: 13 In article <7814@microsoft.UUCP> brianw@microsoft.UUCP (Brian Willoughby) writes: >Just by storing the *difference* between >adjacent samples, and assuming that there are no impulses, a great >savings in data can be achieved over storing 16 bit *absolute* values. I've wondered about this before -- is this the technique known as "delta modulation"? I seem to recall some DACs made by dbx on the market some years ago that employed such a scheme. I gather one of the problems was that errors would start being compounded. Brad Garton Columbia University Music Department brad@woof.columbia.edu