filter7_3.m

椭圆IIR低通滤波器设计?衷睮IR低通滤波器设计

%程序7.3
%巴特沃斯带通滤波器的设计
%
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('最小阻带衰减＝');
[N,Wn]=buttord(Wp,Ws,Rp,Rs);
[b,a]=butter(N,Wn);
[h,omega]=freqz(b,a,256);
plot(omega/pi,20*log10(abs(h)));grid;
xlabel('\omega/\pi');ylabel('增益，dB');
title('IIR巴特沃斯带通滤波器');