I'm new to signal filtering and I'm not sure how to perform the following.
I have a signal that I want to remove noise from, as seen by the unfiltered signal here
The filter used to produce the orange signal is a butterworth filter. What I really want to do is only filter out high frequencies occuring around the y = 0 point (the inflection in the wave) in order to smooth it while not interfering with the morphology of the rest of the signal.
Your help is appreciated!