[Numpy-discussion] zoom FFT with numpy?

Stefan van der Walt stefan@sun.ac...
Fri Mar 16 02:13:07 CDT 2007

Here is another implementation of the Chirp-Z transform in Python,
that handles complex numbers.


On Thu, Mar 15, 2007 at 11:53:49AM +0200, Nadav Horesh wrote:
> A long time ago I translated a free code of chirp z transform (zoom fft) into
> python.
> Attached here the source and two translations (probably one of the is right)
>   Nadav.
> On Wed, 2007-03-14 at 14:02 -0800, Ray S wrote:
>     We'd like to do what most call a "zoom FFT"; we only are interested
>     in the frequencies of say, 6kHZ to 9kHz with a given N, and so the
>     computations from DC to 6kHz are wasted CPU time.
>     Can this be done without additional numpy pre-filtering computations?
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