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Path: utzoo!watmath!clyde!akgua!mcnc!decvax!cca!ima!inmet!muller
From: muller@inmet.UUCP
Newsgroups: net.audio
Subject: CD Phase Shifts from Sampling? - (nf)
Message-ID: <1305@inmet.UUCP>
Date: Sat, 21-Apr-84 06:49:00 EST
Article-I.D.: inmet.1305
Posted: Sat Apr 21 06:49:00 1984
Date-Received: Mon, 23-Apr-84 00:55:45 EST
Lines: 22

#N:inmet:2600067:000:930
inmet!muller    Apr 20 22:48:00 1984

****
One criticism against CD's has been that the placing of data from
the two channels in an alternating pattern causes phase shifts
between the channels.  These shifts, which would be negligible for
low frequencies but would be pi/2 for Nyquist frequency, allegedly
interfere with the spacial image on the reproduced soundstage.
 
Question is:  Are the original samples TAKEN that way?  If so, it
would render this criticism mostly invalid.  Does anyone out there
know the answer to this?
 
Since it would depend on the hardware used, it may be that some A to D
conversions are done this way and some are not.  Thus some recordings
might suffer from this malady while those from some more enlightened 
source wouldn't.  This question would apply even to those made from
digital original tapes, since microphones are all analog.
 
Anybody know?            Thanx, Jim Muller
            ima!inmet!muller   or   harpo!inmet!muller