Hi, I used the butterworth filter with the [b,a] syntax:
d = fdesign.bandpass('N,F3dB1,F3dB2',4,100, 300,SampleRate);
hd = design(d,'butter');
% zero phase shift by reverse filtering
Now I want to use higher order filter numbers where the help suggests to switch to the [z,p,k] syntax.
Wn=[100,300]/(SampleRate/2); % cutoff frequencies normalized by nyquist
[z, p, k] = butter(filtord,Wn,ftype);
Simple question: would will be the appropriate filter command (SignalFiltered=filtfilt(??))? Or is there a missing piece of code? Thanks for your advice! P.S.: Is the missing code the following: