t1.m

数字信号matlab程序,是科学出版社编的书的上机作业

Wp=0.1;Ws=0.4;Rp=1;Rs=15;
[N,Wpo]=cheb1ord(Wp,Ws,Rp,Rs);
[Bz,Az]=cheby1(N,Rp,Wpo);
w=0:0.1:pi;
[H,w1]=freqz(Bz,Az,w);H=20*log(abs(H));
figure(1) 
plot(w/pi,H),grid on
f1=50;f2=500;
fs=1000;T=1/fs;Tp=N*T;%采样频率fa=1kHZ，Tp为采样时间
t=0:T:(N-1)*T;
x=sin(2*pi*f1*t)+cos(2*pi*f2*t);
y=filter(Bz,Az,x);
figure(2)
plot(t,y),grid on