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From:  Steve.Amphlett@ricardo.com
Newsgroups: comp.soft-sys.matlab,sci.math.num-analysis,comp.dsp,sci.math,sci.physics
Subject: Re: How to zoom into a certain part of FFT?
Date: Thu, 28 Jun 2007 06:55:04 -0700
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<snip, terminolgy?...

Maybe the OP is trying to describe Zoom-FFT?  Maybe not, but worth a
punt.  This sort of well-known stuff: http://www.numerix-dsp.com/zoomfft.html