dnrz1.m

用MATLAB实现的信号处理！ 低通滤波器高通滤波器可以输出方波！

function y=dnrz(x)
grid=200;
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)=-1;
          end
      end;end                    %end
y=[y,x(i)];
M=max(y); 
m=min(y);
subplot(2,2,3);
plot(t,y);
title('低通虑信号');
axis([0,i,m-0.1,M+0.1]);
subplot(2,2,4);
plot(t,abs(fft(y)));
title('低通滤波信号频谱');
axis([0,i,0,2000]);