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FFT-bug???? (PV-Wave) [message #10353]

Tue, 18 November 1997 00:00

Franz.Dollinger
Messages: 14
Registered: July 1997

Junior Member

Hi,

is have some problems with PV-Waves's FFT-routines.

I used the FFT routines (FFT, FFTCOMP, DCMPLXFFT) to transform
a complex signal from frequency to time domain and compared the
results to the output of our established Fortran programs.

The absolute value is identical for Fortran and PV-Wave, but the
phase of the PV-Wave output is wrong.

Is there a bug in the routines or are there any tricks when
evaluating the phase of and FFT'd signal in PV-WAVE?

When doing the comparison, identical windowing functions have
been used (Blackman-Harris). I used /Backward.

bye
Franz

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