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Re: Convolution, IDL & Numerical Recipes [message #32672 is a reply to message #32671]

Thu, 31 October 2002 19:41

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article <3DC1D46E.18695AC0@saicmodis.com>,
James Kuyper <kuyper@saicmodis.com> wrote:

As James points out, convolution in the physical domain is equivalent to
multiplication in the spectral domain (and vice versa). Therefore, one
way to convolve (or filter) is to FFT the signal, multiply the spectrum
by the transform of the filter, and inverse FFT. This can be
considerably faster than convolving in the physical domain under some
circumstances.

The trick, of course, is sorting out the wavenumbers and getting the
filter right in the spectral domain. ;-)

Ken Bowman

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[Message index]

		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Fri, 01 November 2002 06:48
		Re: Convolution, IDL & Numerical Recipes By: R.G. Stockwell on Fri, 01 November 2002 06:09
		Re: Convolution, IDL & Numerical Recipes By: R.G. Stockwell on Fri, 01 November 2002 06:01
		Re: Convolution, IDL & Numerical Recipes By: Kenneth P. Bowman on Thu, 31 October 2002 19:41
		Re: Convolution, IDL & Numerical Recipes By: James Kuyper on Thu, 31 October 2002 17:10
		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Thu, 31 October 2002 14:29
		Re: Convolution, IDL & Numerical Recipes By: JD Smith on Thu, 31 October 2002 13:48
		Re: Convolution, IDL & Numerical Recipes By: aceves on Mon, 04 November 2002 18:55
		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Fri, 01 November 2002 06:53
		Re: Convolution, IDL & Numerical Recipes By: aceves on Fri, 01 November 2002 17:06

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