How to correctly apply bandpass filter to EEG data?
47 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
I have 25-electrodes EEG data, I used bandpass(myData, [0.5 40], 250) to apply a simple bandpass filtering on the data I have. I do not know why some time delay is exist after the application of the filter.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/323698/image.jpeg)
0 Kommentare
Antworten (1)
Star Strider
am 29 Jun. 2020
Bearbeitet: Star Strider
am 29 Okt. 2023
The bandpass function (and its friends) in my experience have all used filtfilt to do the actual filtering, so there should not be any delay or phase distortion.
You can check it with:
[myFilteredData, bpdf] = bandpass(myData, [0.5 40], 250);
then:
myFilteredData2 = filtfilt(bpdf, myData);
and see if there is a difference when you plot them.
EDIT — (29 Oct 2023 at 21:58)
The bandpass function (and its friends) will always return an efficient elliptic filter if the 'ImpulseResponse','iir' name-value pair is added to the argument list:
[myFilteredData, bpdf] = bandpass(myData, [0.5 40], 250, 'ImpulseResponse','iir');
.
0 Kommentare
Siehe auch
Kategorien
Mehr zu EEG/MEG/ECoG finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!