Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Tue, 21 Jun 2011 12:31:21 -0600

Michael,

Some years back I implemented the spectrum record which employs a chirp Z
transform (two successive fft transforms provide the spectrum fo <= freq <=
f1).

Jeff
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Jeffrey O. Hill           Email        [email protected]
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Message content: TSPA

With sufficient thrust, pigs fly just fine. However, this is
not necessarily a good idea. It is hard to be sure where they
are going to land, and it could be dangerous sitting under them
as they fly overhead. -- RFC 1925

> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of Michael Davidsaver
> Sent: Tuesday, June 21, 2011 11:43 AM
> To: [email protected]
> Subject: fft
> 
> Has anyone done a routine for the aSub record (or similar) which does an
> fft?
> 
> My input is complex data (two waveforms I and Q) as a function of time
> (512 samples).  Data updates come at ~5Hz.
> 
> I was thinking of using
> 
> http://www.fftw.org/fftw3_doc/Complex-DFTs.html#Complex-DFTs
> 
> Suggestions?

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System