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From: kavaler@zion.berkeley.edu (Robert Kavaler)
Newsgroups: sci.electronics
Subject: Re: Comb filters
Message-ID: <19698@ucbvax.BERKELEY.EDU>
Date: Tue, 14-Jul-87 02:23:49 EDT
Article-I.D.: ucbvax.19698
Posted: Tue Jul 14 02:23:49 1987
Date-Received: Wed, 15-Jul-87 04:12:15 EDT
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Reply-To: kavaler@zion (Robert Kavaler)
Organization: Experimental Computing Facility, U.C. Berkeley
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The human ear is sensative to the relative phase difference between sounds
entering both ears.  This is how we (and animals) can tell where sounds
originate.  By shifting the phase difference a sound can "appear" to 
come from elsewhere.  Phase-shifting techniques are used extensively in
all sorts of stereo equipment, from cheap Boom-boxes to very expensive
mixers.