twice, one forward and one backward to mimic the behavior of filtfilt. You may need to set PersistentMemory to true to retain the state
filtord=4;
SampleRate=20000;
d = fdesign.bandpass('N,F3dB1,F3dB2',4,100, 300,SampleRate);
hd = design(d,'butter');
% zero phase shift by reverse filtering
SignalFiltered=filtfilt(b,a, Signal);
Wn=[100,300]/(SampleRate/2); % cutoff frequencies normalized by nyquist
ftype='bandpass';
filtord=10;
[z, p, k] = butter(filtord,Wn,ftype);
[sos,g]=zp2sos(z,p,k);
hd=dfilt.df2sos(sos,g);
[b,a]= sos2tf(hd.sosMatrix,hd.ScaleValues); SignalFiltered=filtfilt(b,a, Signal);
???????
Prashant Kumar answered . 2024-05-17 20:00:24
SignalFiltered = filtfilt(hd.sosMatrix,hd.ScaleValues,Signal);
hd.PersistentMemory = true; y = filter(hd,Signal); SignalFiltered = filter(hd,fliplr(y));
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