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From: ttak@uhura.cc.rochester.edu (Tim Takahashi)
Newsgroups: rec.audio.high-end
Subject: Re: data compression
Message-ID: <11984@uwm.edu>
Date: 9 May 91 12:52:43 GMT
Sender: news@uwm.edu
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Approved: tjk@csd4.csd.uwm.edu
Originator: tjk@csd4.csd.uwm.edu


In article <11954@uwm.edu> 09nilles%cuavax.dnet@netcon.cua.edu (Fiver Toadflax) writes:
>> This isn't as irrational as you might think.  The problem with the DCC
>> compression scheme is that signal degradation occurs with each
>> encoding.
>
>I haven't seen the details(algorithm) of the DCC compression scheme, but
>if it is any decient, nothing will be lost.  Afterall, look at programs
>such as PCZIP, UUencode, compress.

However, PKZIP et.al. have a compression efficiency of around 2:1 (maybe
more. maybe less for music type data). It is my impression that the sort
of data compression that the DCC will use has a reduction factor of somewhere
around 20:1. The same sort of stuff is proposed for digital photography.
Somehow, it doesn't quite ring true.

tim