AnsweredAssumed Answered

vrf Recall: PNA commands

Question asked by arief12 on Apr 17, 2006

Unless you have a particular need to have the "correct" absolute scale in
the frequency domain, I would not use the scaling function. Just do the
FFT, multiply by your filter function and do the IFFT.
Bill Ossmann
Philips Ultrasound

"Nick Evans" <> wrote on 04/18/2006 11:39:16 AM:

> Hi All
> Can anyone point me in the direction of how to scale the amplitude
> of an inverse fft.   Vee has an example of how to scale the
> amplitude of an fft such that the spectral peaks in the frequency
> domain have amplitudes equal to those in the time domain.  I am
> using this function basically to convert a waveform into the
> frequency domain.  Then I’m manipulating the data with some shaping
> curves and I want to convert it back to the time domain.  The
> problem is that if I strictly reverse the process in the “scale fftâ€
> it does not always give me the correct amplitude back in the time
> domain.   I sometimes end up with huge numbers in the time domain.
> Any help would be greatly appreciated.
> Thanks
> Nick
> ---
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