lj32.asv

基于matlab的数字信号处理程序

Wp = 0.2*pi; Ws =0.3*pi;
[n,Wn] = buttord(Wp,Ws,1,15)
[b,a] = butter(n,Wn);
freqz(b,a,512,500); title('n=2 Butterworth Lowpass Filter')
N=0:1:15;
x=cos(0.5*pi*N);figure(2);plot
y=conv(x,butter(n,Wn));
y1=fft(y);
figure(3);