Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/17/84; site hplabs.UUCP 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