filter7_1.m

椭圆IIR低通滤波器设计?衷睮IR低通滤波器设计

%程序7.1
%椭圆IIR低通滤波器设计
%
Wp=input('归一化通带截止频率＝');
Ws=input('归一化阻带截止频率＝');
Rp=input('单位为dB的通带波纹＝');
Rs=input('单位为dB的最小阻带衰减＝');
[N,Wn]=ellipord(Wp,Ws,Rp,Rs)
[b,a]=ellip(N,Rp,Rs,Wn);
[h,omega]=freqz(b,a,256);
plot(omega/pi,20*log10(abs(h)));grid;
xlabel('\omega/\pi');ylabel('增益,dB');
title('椭圆IIR低通滤波器');