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Path: utzoo!linus!decvax!tektronix!reed!cdi!metheus!howard
From: howard@metheus.UUCP
Newsgroups: net.audio
Subject: Re: CD principles
Message-ID: <165@metheus.UUCP>
Date: Wed, 28-Sep-83 19:57:39 EDT
Article-I.D.: metheus.165
Posted: Wed Sep 28 19:57:39 1983
Date-Received: Fri, 30-Sep-83 21:10:53 EDT
References: drufl.661
Lines: 21

To Phil Rastocny (drufl!pmr):

I don't recall ANYONE claiming that you couldn't hear the difference when you
phase-shift one of two related signals which are being put onto separate
speakers, or even onto one speaker.  Consider two identical sine waves.  If
we add them IN phase we get a louder sine wave, if we add them OUT of phase we
get nothing.  Clearly these will be distinguishable by the ear if the original
sine waves were audible.

However, this has NOTHING to do with most of the preceding discussion about
phase shifts.  It is still true that phase-shifting harmonics with respect
to one another IN A SINGLE SIGNAL produces NO (or extremely little) perceptible
change in sound.  Try reversing the leads to BOTH your speakers at once, thus
shifting the phase of ALL the signal, and tell me you can tell the difference
THEN.  I think you'll find you can't.

Next time you want to make snide remarks about people's submissions to the net,
try understanding them first.  You may find there's no need after all.

	Howard A. Landman
	tektronix!ogcvax!metheus!howard