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From: grt@twitch.UUCP ( G.R.Tomasevich)
Newsgroups: net.audio,net.auto
Subject: Phase distortion on music
Message-ID: <281@twitch.UUCP>
Date: Fri, 21-Feb-86 12:48:58 EST
Article-I.D.: twitch.281
Posted: Fri Feb 21 12:48:58 1986
Date-Received: Mon, 24-Feb-86 21:00:18 EST
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> 1 (hack, cough, wheeze) speakers.  It wasn't that bad at low volume.
> However, most car stereo amplifiers have gross phase distortion (pull out
> your Ford factory radio and run a proof on it) as well as a frequency

The human ear is insensitive to phase and will not be affected by phase
distortion, provided the amplitude vs frequency characteristic is not altered.
The RIAA equalization for records produced horrendous phase shifts
at some frequencies, but we don't care.  We do speech processing here,
so we are aware of what one can do to speech, at least.  Some people in
this department have done 'hi fi' coding, too.  The cheap amplifiers have
other problems, probably including intermodulation distortion.
-- 
	George Tomasevich, ihnp4!twitch!grt
	AT&T Bell Laboratories, Holmdel, NJ