[SciPy-User] [OT] looking for fft

[Jonathan Helmus]

On 04/17/2013 09:08 AM, Neal Becker wrote:
> I'm looking for some fft code that has:
>
> 1. commercial-friendly license
> 2. seperates construction (which involves costly trig functions) from repeated
> use (which should use only multiply-add)
>
> An example of (2) is fftw, but that doesn't meet (1).
>
> I've seen plenty of examples that have (1) but not (2) - these use fft as a
> function, which has no state.  fft should be written as a class, where in the
> constructor all the trig functions are determined.
>
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FFTPACK has initialization functions and is public domain. If that 
doesn't meet your need the FFTW folks maintain an quite extensive list 
of FFT implementations, http://www.fftw.org/benchfft/ffts.html and 
http://www.fftw.org/benchfft/ffts.html.  One of those may be what you 
are looking for.  Also, FFTW can be licensed for commercial use for a 
fee, http://web.mit.edu/tlo/www/industry/fftw-1.html.

     - Jonathan Helmus