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From: todd@appmag.com (Todd Day)
Newsgroups: comp.dsp
Subject: Re: 180 deg phase shift
Message-ID: <1991May9.004109.2471@appmag.com>
Date: 9 May 91 00:41:09 GMT
References: <1644@fs1.ee.ubc.ca> <1991May7.152409.3933@njitgw.njit.edu> <1991May8.022953.781@appmag.com>
Organization: R&D, Applied Magnetics, Goleta, CA
Lines: 17

I wrote:

%Second of all, he *may* have meant a 180 deg phase shift for each of the
%frequencies that add up to his composite signal.  The output signal will
%definitely NOT look much like the input signal.

Sorry about this.  "Phase smearing" does not occur at multiples of pi/2.
I had this visualized totally wrong.  After thinking about "the sum of
infinite sinewaves", I realized that at 180, this sum does align properly
and makes the inverse.  I had gotten it confused with an argument I had
previously discussing 90 degree phase shift in speakers, which definitely
DOES smear the output.

Sorry.

-- 
Todd Day  |  todd@appmag.com