dtmf_1.m

用matlab仿真电话的通信。DTMF仿真

function s=DTMF_1(w0)
s(1)=1;
s(2)=3*cos(w0);
for N=3:400
s(N)=2*cos(w0)*s(N-1)-s(N-2);
end
for N=401:800
    s(N)=0;
end