program_7_9.m

这是国外一本经典教材附带的程序

% Program 7_9
% Design of Multiband Filter Using Hamming Window
%
fpts = [0 0.28 0.3 0.5 0.52 1];
mval = [0.3 0.3 1.0 1.0 0.7 0.7];
b = fir2(100,fpts,mval);
[h,omega] = freqz(b,1,512);
plot(omega/pi,abs(h));grid;
xlabel('\omega/\pi'); ylabel('Magnitude');