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hi all, i'm doing preprocessing of ecg signals. i have an ecg signal with sampling frequency 1000hz. i have lowpass filtered & then highpass filtered the signal.now that i want to use a notch filter or comb filter to remove the powerline interference at 60hz( ,180,300,420,540,660 hz); i used the following code for notch filtering(at 60hz) fs00;f1`; w0=2*pi*f1/fs; r=cos(w0); i=sin(w0); r1=0.99*r; i1=0.99*i; b=conv([1 -r-i*i],[1 -r+i*i]); a=conv([1 -r1-i*i1],[1 -r+i*i1]); h=filter(b,a,ecg); is my code right?i am not getting the plot correctly also. can anyone please help me with the code for my problem? thanx in advance. |