...教学案例集之:几种常用IIR滤波器的设计与滤波应用答:bi, ai = cheby1(order, ripple, cutoff, ...)切比雪夫II型滤波器则在阻带表现出类似特性,阻带波纹幅度参数设为20dB:bi, ai = cheby2(order, ripple, cutoff, ...)椭圆滤波器则综合了通带和阻带的特性,参数控制更灵活,Scipy设计函数如是:bi, ai = ellip(order, ripple1, ripple2, ...
...双线性变换法设计一个数字切比雪夫带阻IIR滤波器。答:利用双线性变换法设计IIR带阻滤波器 MATLAB 程序如下:wp1=0.3*pi;wp2=0.6*pi;ws1=0.4*pi;ws2=0.5*pi;Ap=3;As=10;Fs=1;B=ws2-ws1;w0=sqrt(ws1*ws2);wp=max(abs(wp1),abs(wp2));ws=1;[N,wc]=buttord(wp,ws,Ap,As,'s');[num,den]=butter(N,wc,'s');[numt,dent]...