Path: utzoo!attcan!uunet!seismo!beno!black
From: black@beno.CSS.GOV (Mike Black)
Newsgroups: comp.dsp
Subject: Re: Combining samples......
Message-ID: <48870@seismo.CSS.GOV>
Date: 5 Jun 90 23:46:41 GMT
References: <1990May28.112524.4264@lth.se> <4375@ge-dab.GE.COM> <4697@uafhp.uark.edu> <wilf.644264995@endor> <1431@marlin.NOSC.MIL>
Sender: usenet@seismo.CSS.GOV
Organization: Center for Seismic Studies, Arlington, VA
Lines: 7

I always though combining two samples was not possible in the time domain.
If you add two opposite phase sine waves you'll get a null response.  It's
necessary to do a Fourier Transform to the frequency domain, add the 
amplitudes, and invert the transform.  This will give you twice the amplitude
of the original two sine waves (this would seem to be the desired effect).
Am I totally off-base in this rather long-held belief?
Mike...