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Re: Butterworth Filtering and Inverse FFT problems [message #33854 is a reply to message #33747]

Thu, 30 January 2003 14:22

condor
Messages: 35
Registered: January 2002

Member

jefield@taz.qinetiq.com (Julian Field) wrote in message news:<7126861e.0301220627.59052151@posting.google.com>...

> My other problem is that in both cases, the final array is
> (approximately) symmetrical about a vertical line at the centre of the
> plot, while the original array certainly isn't! Presumably this is
> something to do with positive/negative frequencies and/or
> real/imaginary components?

I *think* you're looking for this:

http://airs2.ssec.wisc.edu/~paulv/fft/fft_comparison.html

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		Butterworth Filtering and Inverse FFT problems By: jefield on Wed, 22 January 2003 06:27
		Re: Butterworth Filtering and Inverse FFT problems By: condor on Thu, 30 January 2003 14:22

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