Application of filtfilt function

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Sohel Rana
Sohel Rana on 24 Mar 2021
Commented: Paul on 17 May 2021
I have a mixed singal in time domain. I applied FFT to find the frequency components. Then I used "filtfilt" to filter the individual signal. Do I need to use ifft to get the time domain individual signal or filtfilt have already done it?
My question: is it necessary to use IFFT after performing the FILFILT on the frequency components of signals to get the time domain singal back?

Accepted Answer

Star Strider
Star Strider on 25 Mar 2021
The filtfilt function filters in the time domain only.
To see the result of the filtering, calculate the fft of the time-domain signals before and after filtering. To see the transfer function of the filter with respect to the signal itself, use element-wise division of the fft of the filtered signal by the fft of the original (unfiltered) signal, and plot it.
  7 Comments
Sohel Rana
Sohel Rana on 17 May 2021
Hi Paul,
Is there a better way to reconstruc signal?
Paul
Paul on 17 May 2021
Hard to say w/o knowing more about the signals. All I was saying is that this procedure cannot, in general, literally reconstruct the signal x1, though it might be very a good estimate of x1, depending on the properties of x1 and x2.

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