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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!hplabs!piety
From: piety@hplabs.UUCP (Bob Piety )
Newsgroups: net.audio
Subject: Re: CD Reflections
Message-ID: <1420@hplabs.UUCP>
Date: Mon, 14-Jan-85 10:48:51 EST
Article-I.D.: hplabs.1420
Posted: Mon Jan 14 10:48:51 1985
Date-Received: Tue, 15-Jan-85 01:38:30 EST
References: <15100001@hpfcmp.UUCP> <3411@mit-eddie.UUCP>
Organization: Hewlett Packard Labs, Palo Alto CA
Lines: 20

> The use of a higher sampling rate (oversampling) is used
> so that the low pass filter used to reconstruct the original 
> waveform need not have a severe slope in the transition band.
> The claim is that a gentler slope reduces phase and group delay
> effects.  For those that care, the CD-2 using 2x oversampling
> requires a 7th order filter to reconstruct the signal.  That's
> still a bit steep for some.  Several manufacturers offer CD
> players that use 4x oversampling.  I haven't heard of any that
> use anything higher.  I don't know if anyone has anything in
> the works or even what the theoretical limit is.  If anyone
> has some information on this, I'd like to hear it.
> 
> Gordon Strong
> {decvax!genrad, ihnp4}!mit-eddie!gs
> GS@MIT-XX

It seems to me that the disc itself was created with a given sampling rate.
How can a player change this?

Bob