Xref: utzoo comp.compression:409 alt.comp.compression:214 Path: utzoo!utgpu!cs.utexas.edu!sdd.hp.com!think.com!mintaka!bloom-beacon!eru!kth.se!cyklop.nada.kth.se!news From: d88-jwa@byse.nada.kth.se (Jon W{tte) Newsgroups: comp.compression,alt.comp.compression Subject: Re: Compression of 16-bit sound files. Message-ID: Date: 20 Apr 91 19:07:11 GMT References: <1991Apr11.141742.13069@mintaka.lcs.mit.edu> <1991Apr17.140822.23647@thebox.rain.com> Sender: news@nada.kth.se (Mr News) Organization: Royal Institute of Technology, Stockholm, Sweden Lines: 28 In-reply-to: rogerc@thebox.rain.com's message of 17 Apr 91 14:08:22 GMT In article <> rogerc@thebox.rain.com (Roger Conley) writes: 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 I think CD's use this technique. I'm quite sure that CDs use a standard, "straight" storage method. Itherwise you wold lose about the one advantage that CDs have over LPs, sound-wise: good response to transients (spikes) and other high-energy, high-frequency sound. Furthermore, CDs use absolute encoding, which is a shame, since relative coding (still 16 bit) would give a lot better dynamics - at a little loss in transients, of course ... No, CDs aren+t compressed. Rather, they're expanded for error correction (added redundancy) If this is Hamming codes or some sort of parity / checksum / CRCs, I do not know. (Please. No comments about CD / LP, Okay ? At least put them in rec.audio...) -- I remain: h+@nada.kth.se (Jon W{tte) (Yes, a brace !) "It's not entirely useless. It came in this great cardboard box !" - Calvin "Life should be more like TV. I think all women should wear tight clothes, and all men should carry powerful handguns" - Calvin, again