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I'm new to DSP so the question might seem a little bit stupid: When using a low pass filter (say Butterworth filter) with Python, I came across an algorithm with which I can reconstruct my signal after filtering (from scipy.lfilter). I'm just wondering how the signal is reconstructed. I thought they used Fourier transform but it's not mentioned. Thank you!

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closed as unclear what you're asking by A_A, MBaz, hotpaw2, lennon310, Tendero Aug 30 '18 at 15:36

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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I agree with A_A. Just take deeper in Butterworth filter design and this article may help you to understand better.

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