I used the following code to produce a 70 tap filter:
fs = 203125;Fpass = 9000;Fstop = 12500;Ap = 1;Ast = 30;Fp = Fpass/(fs/2);Fst = Fstop/(fs/2);d = fdesign.lowpass('Fp,Fst,Ap,Ast',Fp,Fst,Ap,Ast);f = design(d,'equiripple');
However when I enter the same configurations into FDATool by setting fs = 203125, Fpass = 9000, Fstop = 12500, Astop = 30, Apass =1, Lowpass and equiripple, I get a 67 tap filter.
I would like to know the difference between these methods produce and why they produce different filters.
Best Answer