信号时频分析简介——离散小波变换

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fs = 5120;N = 1024;dt = 1.0/Fs;
for i = 1:1024
    x(i) = sin(2*pi*50*i*dt)+0.5*sin(2*pi*1500*i*dt);
end
plot(x);
[c,l] = wavedec(x,3,'db7');
figure;plot(c);
y = waverec(c,l,'db7');
figure;plot(y);