Signal filtering to remove low frequency movement

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ben howey
ben howey 2015-8-27
回答： Star Strider 2015-8-27
I have the following signal - position of object against time.
I want to filter out the longer period signal (around 15 seconds) with a butterworth filter, so it basically removes the big surges? Hugely stuck!
Thanks

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Star Strider
Star Strider 2015-8-27
I would use a bandpass filter with an appropriate low-frequency cutoff to remove the baseline drift and d-c offset, and high-frequency cutoff to remove any high-frequency noise. Determine those frequencies by first doing a fft of your data. (The code between the first two plot images in the fft documentation is all you need to do for this.) My filter design procedure is here.

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