ex46.bak

数字信号分析处理方面的好教材,有DSP的MATLAB源程序.

%信号
k=[1:1:1000];
x1=sin(2*pi*5*k*0.001);
x2=sin(2*pi*50*k*0.001);
x=x1+x2;

%滤波器设计
%[b,a]=butter(9,20/450);freqz(b,a,512,1000)
[b,a]=butter(50,100/450);freqz(b,a,512,1000)
%[b,a]=butter(10,40/500,'high');freqz(b,a,512,1000)


%滤波
y=filter(b,a,x);
plot(k,x,'b',k,x1,'m',k,y,'r')