Application of filtfilt function
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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?
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Star Strider
le 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.
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Paul
le 17 Mai 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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