Looking for good FFT code

I'm looking for some FFT code that meets most if not all of the following criteria:

C++ based
MFC - compatible (any C++ code should be, I expect)
FAST - will be used in real time app.
Optimized for small data sets - between 256 and 1024 points
Optimized for real-function inputs (no complex inputs)
Must be free - it's for use in a school project
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carlosnAsked:
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arnondCommented:
take a look at:
http://www.fftw.org/
it's in c and free.

Arnon David.
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arnondCommented:
also,
http://www.intersrv.com/~dcross/fft.html
http://wwwisg.cs.uni-magdeburg.de/~makoenig/holo/qholo.html (this is an application that uses FFT and the source code is also available)
http://www.fullspectrum.com/deeth/programming/fft.html (some links and also, there's at least one link to source code (maybe not in C/C++) and a dll you can use)
http://sal.rising.com.au/B/0/FXT.html
http://www.tri-core.com/dsp/apps.html (some DSP routines, writen in assembly which you can use in your app.)
http://www-ca.informatik.uni-tuebingen.de/people/musser/gpseminar/blitz/fft.html

I hope you can find what you need in one of the URLs I gave you.

Arnon David.
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svjCommented:
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arnondCommented:
carlson, the links wouldn't work if you try to go through them via EE. it's a bug in EE. you need to manualy go there.

chensu, didn't you see that i've already suggested the intersrv.com url ?

Arnon David.
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chensuCommented:
>didn't you see that i've already suggested the intersrv.com url ?

Sorry, I didn't see it.
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arnondCommented:
no hard feelings, chensu...

Arnon David.
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carlosnAuthor Commented:
Regarding the Intel library.  What is the decrease in performance if they are run on non-Intel machines.  The target for this software is very cheap machines, which likely means AMD, and Cyrexx (and Celerons too)
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carlosnAuthor Commented:
Thanks for all the suggestions, it turns out that with some tweaking the code from relisoft was enough for my applicaiton.  (and faster than FFTW!)

Carlos

I never did find out if the Intel library still worked OK with AMD chips, or if it suffered to great a penalty.
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chensuCommented:
>it turns out that with some tweaking the code from relisoft was enough for my applicaiton.

So, that's my suggestion, isn't it?

Thank you.
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