例 试求下面系统函数的零极点形式 2 阶因子形式。
%Determination of the factored form and
%the second order section form of a
% rational z-transform
b =[1 0 0.04 0];
a =[1 -0.8 0.16 -0.128];
[z,p,k]=tf2zp(b,a);
disp('Zeros are at'); disp(z);
disp('Poles are at'); disp(p);
disp('Gain constant');disp(k);
sos=zp2sos(z,p,k);
disp('Second-order sections');
disp(real(sos));
128.016.08.0
04.0
)(
23
3
zzz
zz
zH
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