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Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!ihnp4!ihlpf!ejn
From: ejn@ihlpf.UUCP (E Northrop)
Newsgroups: net.audio
Subject: CD Error Correction Questions - (nf)
Message-ID: <237@ihlpf.UUCP>
Date: Fri, 17-Feb-84 03:00:28 EST
Article-I.D.: ihlpf.237
Posted: Fri Feb 17 03:00:28 1984
Date-Received: Sat, 18-Feb-84 01:38:31 EST
Organization: AT&T Bell Labs, Naperville, IL
Lines: 26

#N:ihlpf:4000039:000:796
ihlpf!ejn    Feb 16 20:14:00 1984

Greg Rogers mentioned in his fine article that error bursts up to
4000 bits are completely correctable and bursts up to 12,300 bits
are correctable by interpolation.  Some questions:

1.	Do ALL CD players correct to the fullest extent made possible
	by the coding redundancy or do some only correct errors up to,
	say, 2000 bits?  (After all, the manufacturers are in this for
	the money and skimping in this area is easily hidden from the
	casual buyer.)

2.	What is the nature of the interpolation process and what
	degradation (from perfection) of the signal results?

3.	The bit rate of the PCM is obviously 2 * 44.1 * 16 kbps, but what
	is the bit rate as the data comes off of the CD (including
	redundancy)?



				Eric Northrop
				AT&T Bell Laboratories
				Naperville, IL
				ihlpf!ejn