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My signal's base line is around 1. When I apply Butterworth high pass filter with cut off frequency Fc = 2Hz signal's base line drops to 0. My data are from the accelerometer. Is this behavior normal ?

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Yes. A high-pass filter removes low frequencies, and a constant baseline is the lowest frequency possible ("DC" = 0 Hz), so it will be completely removed and the baseline will become 0.

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