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From: pmr@drufl.UUCP (Rastocny)
Newsgroups: net.audio
Subject: Re: CD principles
Message-ID: <661@drufl.UUCP>
Date: Thu, 22-Sep-83 10:21:03 EDT
Article-I.D.: drufl.661
Posted: Thu Sep 22 10:21:03 1983
Date-Received: Sun, 25-Sep-83 12:12:54 EDT
References: <208@tesla.UUCP>
Organization: AT&T Information Systems, Denver
Lines: 19

It amazes me as to how many people believe what they read and few
believe their own ears.  If you don't believe that a 180 degree phase
shift is audibly confusing, switch the polarity of the speaker wire
on one of your speakers.

This is slightly different from what is happening in the D/A conversion,
but the correlation can be made.  Things just don't sound quite right
with this much phase shift.

The best way to compare analog and digital playback integrity is to
listen to violins.  If you know what a violin sounds like, analog is
closer to reproducing one more correctly.  Next, listen to an instrument
with little harmonic content above 2KHz like a low-level passages of
bass drum to eliminate a dynamic range contest.  Digital now sounds
more accurate (phase is more linear in this region).

Phil Rastocny
AT&T Information Systems Laboratories
drufl!pmr