FIR filter

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!

Answer 1

[Wayne King]

   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.

[Qifei]

you are right.. I mean the firls . Thanks very much ! and how about " the same filter with the matlab function fir1 with a hamming and boxcar windows". What is the difference between them ?

I am totally confused by these filters ...

[Wayne King]

fir1 uses the window method. That is a different filter design method. The window method is described in any DSP book.