模拟原型设计程序hc822 OmegaP=2*pi*5000;OmegaS=2*pi*12000;Rp=1;As=30; %确定滤波器的阶次和边缘频率 N=ceil(logl0(10.(0.1*abs(Rp)-1)./(10.(0.1*abs(As)-1)). /(2*log10(OmegaP/OmegaS))) OmegaC=OmegaP /((10(.1*abs(Rp))-1)(1/(2*N))); %上两条语句可用下面一条语句代替 [N,OmegaC]=buttord(OmegaP,OmegaS,Rp,As,'s') [z0,p0,k0]=buttap(N) %得到左半平面零极点 %求归一化系数b0,a0 bO=kO*real(poly(zO));a0=real(poly(po)) 1919 模拟原型设计程序hc822 OmegaP=2*pi*5000; OmegaS=2*pi*12000;Rp=1;As=30; % 确定滤波器的阶次和边缘频率 N=ceil( log10((10 .^ (0.1*abs(Rp))-1)./(10 .^(0.1*abs(As)) - 1) )… / (2*log10(OmegaP/OmegaS)) ) OmegaC= OmegaP / ( (10^(.1*abs(Rp)) - 1)^(1/(2*N)) ); % 上两条语句可用下面一条语句代替 % [N, OmegaC] =buttord(OmegaP, OmegaS, Rp, As, 's') [z0,p0,k0] = buttap(N) %得到左半平面零极点 % 求归一化系数b0,a0 b0=k0*real(poly(z0)); a0=real(poly(p0))