信号与系统第八章答案Word文档下载推荐.docx
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Warning:
FunctioncallHeavisideinvokesinexactmatchC:
\MATLAB7\work\heaviside.m.
8.3
(1)
a=[1,3,2];
b=[1];
y1=impulse(b,a,0:
1:
10)
y2=step(b,a,0:
subplot(1,2,1);
impulse(b,a,10);
冲击信号'
);
subplot('
1,2,2'
step(b,a,10);
阶跃响应'
y1=
0
0.2325
0.1170
0.0473
0.0180
0.0067
0.0025
0.0009
0.0003
0.0001
0.0000
y2=
0.1998
0.3738
0.4515
0.4819
0.4933
0.4975
0.4991
0.4997
0.4999
0.5000
(3)
a=[1,4,5];
b=[1,0];
impulse(b,a,5)
冲击响应'
subplot(1,2,2)
step(b,a,5)
1.0000
-0.1546
-0.0409
-0.0032
-0.0000
0.1139
0.0167
-0.0003
8.4
a=[1,1/2];
b=[1,2];
n=0:
20;
f=2*cos(n.*pi/3);
y=filter(b,a,f)
subplot(1,2,1)
stem(n,f,'
filled'
输入x(n)'
stem(n,y,'
响应序列y'
y=
Columns1through7
2.00004.0000-1.0000-3.5000-3.25000.62503.6875
Columns8through14
3.1563-0.5781-3.7109-3.14450.57233.71393.1431
Columns15through21
-0.5715-3.7142-3.14290.57143.71433.1429-0.5714
8.6
a=[1,1,1/4];
y=step(b,a,0:
1.5:
20)
y1=impz(b,a,20)
impz(b,a,20)
单位序列'
step(b,a,20)
0.6934
1.7687
2.6298
3.2034
3.5532
3.7556
3.8688
3.9306
3.9637
3.9812
3.9903
3.9951
3.9975
-1.0000
0.7500
-0.5000
0.3125
-0.1875
0.1094
-0.0625
0.0352
-0.0195
0.0107
-0.0059
0.0032
-0.0017
-0.0005
-0.0001
8.7
a=[012100];
b=[0111100];
c=conv(a,b);
n=-3:
8;
stem(n,c,'
n'
ylabel('
y(n)'
零状态响应y(n)=x(n)*h(n)'
8.8
x1=[012100];
x2=[0111110];
f=conv(x1,x2);
n=-5:
6;
零状态响应y(n)=x1(n)*x2(n)'
x3=[003210];
f=conv(x2,x3);
零状态响应y(n)=x2(n)*x3(n)'
8.9
t1=-1:
0.01:
5;
f1=Heaviside(t1)-Heaviside(t1-2);
t3=t1;
f3=0.5*t3.*(Heaviside(t3)-Heaviside(t3-2));
[t,f]=gggfconv(f1,f3,t1,t3)
请输入取样时间间隔d:
(5)
t3=-1:
t4=t3;
f4=0.5*t3.*(Heaviside(t3+2)-Heaviside(t3))+0.5*t3.*(Heaviside(-t3-2)-Heaviside(-t3));
[t,f]=gggfconv(f3,f4,t3,t4)