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From: mat@hou5d.UUCP (M Terribile)
Newsgroups: net.audio
Subject: Re: CD principles
Message-ID: <681@hou5d.UUCP>
Date: Fri, 30-Sep-83 18:56:37 EDT
Article-I.D.: hou5d.681
Posted: Fri Sep 30 18:56:37 1983
Date-Received: Sun, 2-Oct-83 21:15:12 EDT
References: drufl.661 <165@metheus.UUCP>, <259@pyuxn.UUCP>
Organization: AT&T Information Systems Laboratories, Holmdel, NJ
Lines: 18

Regarding the question of whether phase distortion i.e. dispersion and
group delay can be heard, and whether harmonic content is all that matters:

I would not be surprised in the least to hear that in the range of 3kHz
and up there is no audible difference.

On the other hand, since we can begin to distinguish between sound events
that happen a few milliseconds, or a few tens of milliseconds, apart,
I would not be surprised if such distortion became audible when the
frequencies involved are 300 Hz or below.

With CD players, the noticable phase distorion is taking place at
frequencies above 10 kHz.  I would be more concerned with the fact that
a few people have SOME preception of sounds over 20 kHz and that CDs are
limited to not much more than that.

					Mark Terribile
					hou5d!mat