HOW TO DESIGN A BANDPASS FILTER

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raj 2012-3-30

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I need to design a bandpass filter with sampling rate of 10kHz and bandpass of 0 to 1kHz and then insert a signal my signal in the filter can any one give the syntax for it

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Wayne King 2012-3-30

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You need a lowpass filter. You can use fdesign.lowpass. There are many possible specification strings. You have not stated all your specs, like how many dB of attenuation you wish to have. I'll create an example with 50 dB and obtain both an FIR filter (Hd1) and an IIR filter(Hd2)

   d = fdesign.lowpass('Fp,Fst,Ap,Ast',1000,1200,0.5,50,1e4);
   Hd1 = design(d,'equiripple');
   Hd2 = design(d,'butter');
   t = 0:1e-4:1;
   x = cos(2*pi*500*t)+0.5*cos(2*pi*2000*t)+randn(size(t));
   out = filter(Hd1,x);
   % or out = filter(Hd2,x);