nozero.m

用matlab仿真电话的通信。DTMF仿真

function y=nozero(x)
grid=300;
t=0:1/grid:length(x);
for i=1:length(x)
    if(x(i)==1)
        for j=1:grid
            y((i-1)*grid+j)=1;
        end
    else
        for j=1:grid
            y((i-1)*grid+j)=0;
        end
    end
end
y=[y,x(i)];
subplot(1,1,1);
plot(t,y);
axis([0,i,0,1.5]);
title('非归零基带信号');