how to use Butterworth filter to get rid of noise?
1 view (last 30 days)
Show older comments
I cannot figure out how to use a lowpass butterworth filter on this piece of data.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/196033/image.png)
Here is what I have so far
Ts = mean(diff(x));
Fs = 1/Ts;
Fn = Fs/2;
I found the sample rate to find Wn, however I do not know what to set the cutoff value.
Wn1=10/(Fn);
[b,a] = butter(6,Wn1,'low');
y2 = filter(b,a,y_pr);
unfortunately this would distort the data and make most peaks the same height
1 Comment
Star Strider
on 17 Sep 2018
Ahmed Emam later added:
‘... my code is also required to handle a sampling rate varying from 0.5 kHz to 2 kHz. I wanted to use the lowpass option in the butterworth filter. The output I am looking for is the same EKG graph but with less noise.’
This is not a trivial omission.
Answers (0)
See Also
Categories
Find more on 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!