Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Tue, 21 Jun 2011 13:25:08 -0500

Hi Michael,

On 2011-06-21 Michael Davidsaver wrote:
> 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

Not sure if this will be any use to you, given that I don't see anything about 
complex input data:
  http://www.aps.anl.gov/epics/modules/soft/waveProc/index.html

The waveProc module pre-dates the inclusion of the aSub record in Base and 
includes a copy of the genSub record type, plus the spectrum and waveAnl 
records.  They might give you some ideas at least.

- Andrew
-- 
Optimization is the process of taking something that works and
replacing it with something that almost works, but costs less.
-- Roger Needham

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System