Application of filtfilt function

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Sohel Rana 2021-3-24

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评论： Paul 2021-5-17

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 2021-3-25

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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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Sohel Rana 2021-5-17

Hi Paul,

Is there a better way to reconstruc signal?

Paul 2021-5-17

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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