It is a common practice to apply windowing function, such as Hann or Hamming, to a time domain signal before FFT, in order to reduce spectral leakage. Often, we do 1) Windowing, 2) FFT, 3) frequency domain processing, such as filtering, then 4) Inverse FFT. My questions are: before inverse FFT, do we need to apply a windowing function in frequency domain as well? If we do, how?

Thanks in advance.

  • $\begingroup$ "Windowing in frequency domain" is the same as low-pass filtering. I would not advise to do so unless you have a good reason (such as, noise filtering of a lowpass signal in noise for instance). $\endgroup$ – Florian Oct 12 '20 at 22:02

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