Filter Design
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Hi, I am a recent graduate, intermediate user of MATLAB. I want to design a filter that can say chop down the harmonics of 20Hz but not 20Hz itself. I have been trying using comb notch filter but it chops down my 20Hz frequency as well.
Thanks.
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Wayne King
2012-6-19
Hi Deep, I'm assuming that you want to try and only remove the content around the harmonics of 20 Hz, so that a general lowpass filter won't do. I'll assume a sampling frequency of 1 kHz.
Fs = 1000;
d1 = fdesign.notch('N,F0,Q,Ap',6,40,10,1,Fs);
d2 = fdesign.notch('N,F0,Q,Ap',6,60,10,1,Fs);
d3 = fdesign.notch('N,F0,Q,Ap',6,80,10,1,Fs);
Hd1 = design(d1);
Hd2 = design(d2);
Hd3 = design(d3);
Hcas = dfilt.cascade(Hd1,Hd2,Hd3);
fvtool(Hcas,'Fs',Fs);
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