MATLAB: Blackman FIR bandpass filter design

filter design

I tried to generate FIR Blackman bandpass filter (1-50 Hz passband) using window method. I used fdesign.bandpass with specifications of N, F3dB1, F3dB2 and then tried to generate Hd using window(d,'window',@blackman), but found that this combination only works for lowpass (and maybe highpass) filter. What am doing wrong? Is there an easy way to design Blackman FIR bandpass filter?

Best Answer

Hi olga,
There is a subtle difference between the specification of an IIR filter and an FIR filter. Because you are designing an FIR filter, you need to use 'N,Fc1,Fc2' instead of 'N,F3dB1,F3dB2'. Here is an example
h = fdesign.bandpass
h.Specification = 'N,Fc1,Fc2'
Hd = window(h,'window',@blackman)
fvtool(Hd)
HTH,
Honglei
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