MATLAB: FIR filter

firlms

Make a matlab function for design a FIR filter of order 32 with the LMS method.

I am now learning to use matlab . first learner,, Can anyone give some suggestions ? Thank you very much!

Best Answer

   b = firls(30,[0 .1 .2 .5]*2,[1 1 0 0]);
   fvtool(b);

Obviously you have to specify more than the order. You have to give your frequencies and the amplitudes you wish at those frequencies. I have just used some values above.

Please read the reference page for firls.

Also, I'm assuming that you mean this filter and not the LMS adaptive FIR filter.

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MATLAB: Fir and iir filtering

You have to know your filter specifications. If you do, you can do both with fdesign.lowpass and fdesign.highpass

fdesign.lowpass and fdesign.highpass have different specification strings which support different filter designs.

The default string 'Fp,Fst,Ap,Ast' supports both FIR and IIR designs.

Here is an example:

Design a lowpass filter with a passband frequency of 1 kHz, a stopband frequency of 1.5 kHz, passband ripple of 0.5 dB, and stopband attenuation of 40 dB. The sampling frequency is 20 kHz

   d = fdesign.lowpass('Fp,Fst,Ap,Ast',1e3,1.5e3,0.5,40,20e3);
   designmethods(d)  %shows which designs are valid for this spec
   Hdeq = design(d,'equiripple'); % FIR filter
   Hbutt = design(d,'butter'); %IIR design

MATLAB: FIR filter

I have no idea what you have declared for w1, w2, and no, but I'll assume those are correct.

   w2 = c+(w/2);
   w1 = c-(w/2);
   W = [w1 w2]; 
   b = fir1(no,W);
   filtered_sig = filtfilt(b,1,x');

Best Answer

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