信号与系统MATLAB实验课后习题答案.doc

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1、 第三章练习题1、a=1,1,1;b=1,1;sys=tf(b,a);t=0:0.01:10;figure;subplot(2,2,1);step(sys);subplot(2,2,2);x_step=zeros(size(t);x_step(t0)=1;x_step(t=0)=1/2;lsim(sys,x_step,t);subplot(2,2,3);impulse(sys,t);title(Impulse Response);xlabel(Time(sec);ylabel(Amplitude);subplot(2,2,4);x_delta=zeros(size(t);x_delta(t=0

2、)=100;y1,t=lsim(sys,x_delta,t);y2=y1;plot(t,y2);title(Impulse Response);xlabel(Time(sec);ylabel(Amplitude);Step Response1.5Linear Simulation Results1.511edueduttiillppmAmA0.500.5005100510Time (sec)Time (sec)Impulse Response1Impulse Response10.50edu0.5eduttilpimlpmAA0-0.5-0.505100510Time(sec)Time(sec

3、) (sec) 2、函数int1如下：function F,tF=int1(f,tf,a)T=tf(2)-tf(1);F=zeros(size(tf);tF=zeros(size(tf);tF=tf;for n=1:length(tf)-1;F(n+1)=F(n)+T*f(n);end验证如下：t=-1:0.01:4;e=zeros(size(t);e=(t-1/2&t0 S=0;break; End;End;稳定系统：Sys=tf(1,1,2);S=isstable(sys);S= 1不稳定系统：Sys=tf(1,1,-2);S=isstable(sys);S=0 第七章练习题1、a=1,0.5,-0.2,-0.1;b=1,-0.3;n=0:10;hi,t=impz(b,a,n);subplot(1,2,1);stem(n,hi);u=(n=0);hn=filter(b,a,u);subplot(1,2,2);stem(n,hn); 2、n1=0:9;n2=10:19;x1=(n1=0);x2=-(n2=10);a1=1,-0.2,-0.1;a2=1,-0.2,0.5;b=1,0.01;y1,wf1=filter(b,a1,x1,0,1);y2,wf2=filter(b,a2,x2,wf1);stem(n1,y1);hold on;stem(n2,y2);