说明最小相位_最大相位_混合相位系统的matlab程序.docx

%----------------------------------------------------------------------

% to explain the minimum,maxmum and mixed-phase system;

%----------------------------------------------------------------------

clear all;

N=20;

b1=[1 -1 0.75 -0.25 0.0625];

b2=[0.25 -0.625 1.3125 -0.625 0.25];

b3=[0.0625 -0.25 0.75 -1 1];

[H2 w]=freqz(b2,a,256,1);

[H3 w]=freqz(b3,a,256,1);

fupin1=abs(H1);

fupin2=abs(H2);

fupin3=abs(H3);

subplot(337)

plot(w,abs(H1),w,abs(H2),w,abs(H3));grid on;

% 计算三者的相频响应

subplot(338)

pha1=unwrap(angle(H1));

h3=impz(b3,a,N);

t=0:N-1;

subplot(334)

stem(t,h1,'.')

hold on;

plot(t,zeros(size(h1)))

subplot(335)

stem(t,h2,'.')

hold on;

plot(t,zeros(size(h2)))