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From: jphalter@ihuxb.UUCP
Newsgroups: net.audio
Subject: CD Error Correction
Message-ID: <380@ihuxb.UUCP>
Date: Tue, 11-Oct-83 16:17:35 EDT
Article-I.D.: ihuxb.380
Posted: Tue Oct 11 16:17:35 1983
Date-Received: Thu, 13-Oct-83 03:08:24 EDT
Organization: AT&T Bell Labs, Naperville, Il
Lines: 22

Present CD test discs have an opaque wedge on them to allow testing of a
CD player's error correction circuitry. This wedge runs from 0 to 900 microns
in width. The best players on the market can track through this wedge without
mistracking (skipping or creating a drop-out).

Since I don't use microns for everyday calculations, I made a quick conversion
from microns to inches to determine just how good the error correction 
circuit on a top-notch CD player is. 


   Since     2.54cm=1in  and 1 meter = 1,000,000 microns and 100 cm = 1m

     a CD player can correct over:

     900microns x (1m/1,000,000 microns) x (100cm/1m) x (1 in /2.54 cm) =

                              1/28 of an inch
                            -------------------


So much for 1/8" strips of tape on the disc!!!