What is a Butterworth filter?
I have raw X, Y, Z acceleration sensor data that I need to smooth them from noise. I have read that a Butterworth filter is one of the most appropriate for the specific kind of job I am working on.
Is that filter being applied directly on the raw data (time-amplitude domain) or I need to translate the data to the frequency-amplitude domain (using FFT)?
Is IIR any kind of a Butterworth filter?
What do I make with the result from that filter? Do I multiply it on my data in order to filter them out?