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> (And Rosta <a.rosta@hidden.email>): > Correct me if I'm wrong, but I take it that compression & > redundancy (in the signal) are inversely proportional -- the > more of one, the less of the other. > > Outside of language, how do other technologies cope with > the need to transmit information accurately over a low- > bandwidth channel? You just use carefully engineered minimal redundancy instead of the ad-hoc kind. Compressing a message first removes all the natural redundancy and minimizes its entropy. Then, it is sent over a channel with some precisely added tiny amount of redundancy that's tuned to the actual performance of the channel to guarantee accuracy without wasting bits. -- Lee Daniel Crocker <lee@hidden.email> <http://www.piclab.com/lee/> "All inventions or works of authorship original to me, herein and past, are placed irrevocably in the public domain, and may be used or modified for any purpose, without permission, attribution, or notification."--LDC