program_7_10.m

这是国外一本经典教材附带的程序

% Program 7_10
% Design of Least-Squares Error Linear-Phase FIR Filters
%
N = input('Type in the order = ');
fpts = input('Type in the bandedge vector = ');
mag = input('Type in the magnitude value vector = ');
wt = input('Type in the weight vector = ');
b = firls(N,fpts,mag,wt);
[h,w] = freqz(b,1,256);
plot(w/pi,20*log10(abs(h)));grid;
xlabel('\omega/\pi'); ylabel('Gain, dB');