Date: Mon, 8 Sep 1997 02:55:29 -0400 From: Lee Cremeans <lee@wakky.dyn.ml.org> To: "Jamil J. Weatherbee" <jamil@counterintelligence.ml.org> Cc: hackers@freebsd.org Subject: Re: i refuse to spend the $$$ Message-ID: <19970908025529.27382@wakky.dyn.ml.org> In-Reply-To: <Pine.BSF.3.96.970907225228.1391A-100000@counterintelligence.ml.org>; from Jamil J. Weatherbee on Sun, Sep 07, 1997 at 10:54:37PM -0700 References: <19970908072530.ZD14625@uriah.heep.sax.de> <Pine.BSF.3.96.970907225228.1391A-100000@counterintelligence.ml.org>
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On Sun, Sep 07, 1997 at 10:54:37PM -0700, Jamil J. Weatherbee wrote: > > Can someone explain the real difference between an audio CD and a data CD? > I seen mentions of things like "jitter correction" etc. that I don't > really understand, I have a somewhat decent grip on data cd's but as for > audio --- are these made differently or what? An audio CD has tracks and stuff just like a data CD, but the format's a little different; it follows what's called the "Red Book" standard put forth by Sony and Philips. The TOC is the same as on a data CD, but the sector size is 2352 bytes, and there's no checksumming or ECC of any kind--that's why audio CDs can skip. That's also what prompted the comment about CD-DA download quality--since there's no ECC, there's no way to tell if the data was corrupted during read or not; you only know when you hit a hard error, and that's usually too late. BTW, I'm not quite an expert on Red Book, so I'm gonna cross-post this to -hackers in hopes that someone will correct this where its needed :) -- Lee C. -- Manassas, VA, USA (WakkyMouse on DALnet #watertower) A! JW223 YWD++^i WK+++r P&B++ SL++^i GDF B&M KK--i MD+++i P++ I++++ Did $++ E5/10/70/3c/73ac Ee34/1/36 H2 PonPippi Ay77 M | hcremean (at) vt.edu FreeBSD/Linux/Unix hacker...Win95 and M$ evil! (go see www.freebsd.org) My home page: http://wakky.dyn.ml.org/~lee | finger me for geek code
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