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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!charm!prk
From: prk@charm.UUCP (Paul Kolodner)
Newsgroups: net.audio
Subject: error correction in cd's
Message-ID: <679@charm.UUCP>
Date: Sat, 8-Jun-85 00:34:24 EDT
Article-I.D.: charm.679
Posted: Sat Jun  8 00:34:24 1985
Date-Received: Sun, 9-Jun-85 02:26:17 EDT
Organization: Physics Research @ AT&T Bell Labs Murray Hill NJ
Lines: 10




>Have you ever put your favourite CD up to a light source?  Choose one
>that doesn't have an opaque label.  There are definitely defects there
>that are more than 1 bit!  Thank goodness for error correction.

You need a lesson in optics.  What you see is not what the laser sees.
It has a one-micron depth of focus set below the level of what you're
seeing.  You don't.