rp = rs = 0.001; %Passband ripple,Stopband ripple
fs = 1.4*10^7;
f = [1.75*10^6/fs 5.25*10^6/fs]; % Cutoff
frequencies
a = [1 0];
dev = [rp rs];
[n,fo,ao,w] = firpmord(f,a,dev,fs);
if(rem(n,2) == 0)
m = n;
else
m = n+1;
end
b = firpm(m,fo,ao,w);
b
[h,w] = freqz(b,1,512,fs);
freqz(b,1,512,fs);