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From: rlr@pyuxn.UUCP
Newsgroups: net.audio
Subject: Re: CD principles
Message-ID: <259@pyuxn.UUCP>
Date: Fri, 30-Sep-83 09:49:51 EDT
Article-I.D.: pyuxn.259
Posted: Fri Sep 30 09:49:51 1983
Date-Received: Sun, 2-Oct-83 06:54:01 EDT
References: drufl.661 <165@metheus.UUCP>
Organization: Bell Labs, Piscataway
Lines: 17


I believe that there has been research done that states that one cannot
tell the difference between a tone (say a square wave) which has a certain
harmonic content (a square wave contains all odd harmonics in amounts
inversely proportional to their harmonic number) and another tone with
equivalent harmonic content where the phases of some of the harmonic
components are reversed in the resulting waveform (which in this case,
would no longer be a square wave in shape as a result).  It is my
understanding that THIS is the kind of phase shift that we are talking
about here.  This does not imply anything about one speaker producing the
square wave and the other producing the altered tone (i.e., phase shift
in one of the two speakers but not the other).  It implies that if a range
of frequencies are shifted uniformly in both speakers, the listener could
not distinguish this from the original sound.

This was from a course in electronic music and acoustics many years ago, so
I don't remember where this is documented.