Filtering a signal only around 0
3 views (last 30 days)
Show older comments
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!
1 Comment
dpb
on 16 Dec 2019
You can try multiplying by a gain factor near unity at whatever you think is "near" 0 that scales rapidly to small values for range of input signal, filter, then inverse gain the result. That should leave more or less continuous.
Or, you can just try it and see if can live with discontinutiy by just selecting y(y<thresh) and operating on it.
I don't know of any specific work of the type but there well may be if look for it in literature.
Answers (0)
See Also
Categories
Find more on Digital Filter Analysis in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!