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数字信号处理matlab习题答案.docx
课后Matlab习题解答
学院：电子信息工程学院
专业：通信工程
指导老师：钱满义
1、第一章
M1-1
M1-2
M1-3
M1-4
M1-5
M1-6
2、第二章
M2-1
M2-2
M2-3
M2-4
M2-5:
M2-6
3、第四章
M4-1
M4-2
M4-3
M4-4
M4-5
M4-6
M4-7
M4-8
M4-9
4、第五章
M5-1
M5-2
M5-3
M5-4
M5-5
M5-6
M5-7
M5-8
M5-9
M5-10
5、第六章
M6-1
M6-2
6、第七章
M7-1
M7-2
M7-3
M7-4
M7-5
数字信号处理
课后 Matlab 习题解答
学院：电子信息工程学院
专业：通信工程
指导老师：钱满义
2015 年 6 月 26 日
目录
课后 Matlab 习题解答......................................................................................................................1
1、第一章 .......................................................................................................................................... 4
M1-1............................................................................................................................................ 4
M1-2............................................................................................................................................ 5
M1-3............................................................................................................................................ 7
M1-4............................................................................................................................................ 9
M1-5.................................................................................................................................................. 10
M1-6.................................................................................................................................................. 11
2、第二章 ........................................................................................................................................ 12
M2-1.................................................................................................................................................. 12
M2-2.................................................................................................................................................. 15
M2-3.................................................................................................................................................. 16
M2-4.................................................................................................................................................. 18
M2-5:................................................................................................................................................ 20
M2-6.................................................................................................................................................. 21
3、第四章 ........................................................................................................................................ 23
M4-1.......................................................................................................................................... 23
M4-2.......................................................................................................................................... 24
M4-3.......................................................................................................................................... 25
M4-4.......................................................................................................................................... 27
M4-5.......................................................................................................................................... 28
M4-6.......................................................................................................................................... 29
M4-7.......................................................................................................................................... 31
M4-8.......................................................................................................................................... 32
M4-9.......................................................................................................................................... 34
4、第五章 ........................................................................................................................................ 35
M5-1.......................................................................................................................................... 35
M5-2.......................................................................................................................................... 35
M5-3.......................................................................................................................................... 37
M5-4.......................................................................................................................................... 39
M5-5.......................................................................................................................................... 39
M5-6.......................................................................................................................................... 39
M5-7.......................................................................................................................................... 40
M5-8.......................................................................................................................................... 40
M5-9.......................................................................................................................................... 40
M5-10........................................................................................................................................ 40
5、第六章 ........................................................................................................................................ 40
M6-1.......................................................................................................................................... 40
M6-2.......................................................................................................................................... 40
6、第七章 ........................................................................................................................................ 44
M7-1.......................................................................................................................................... 44
M7-2.......................................................................................................................................... 45
第 2页
M7-3.......................................................................................................................................... 47
M7-4.......................................................................................................................................... 48
M7-5.......................................................................................................................................... 48
第 3页
1、第一章
M1-1
代码：
f=10;
t=-0.2:0.001:0.2;
g1=cos(6.*pi.*t);
g2=cos(14.*pi.*t);
g3=cos(26.*pi.*t);
k=-0.2:1/f:0.2;
h1=cos(6.*pi.*k);
h2=cos(14.*pi.*k);
h3=cos(26.*pi.*k);
subplot(4,1,1);
plot(k,h1,'r.',t,g1,'r');
xlabel('t');
ylabel('g1(t)');
subplot(4,1,2);
plot(k,h2,'g.',t,g2,'g');
xlabel('t');
ylabel('g2(t)');
subplot(4,1,3);
plot(k,h3,'b.',t,g3,'b');
xlabel('t');
ylabel('g3(t)');
subplot(4,1,4);
plot(t,g1,'r',t,g2,'g',t,g3,'b',k,h1,'r.',k,h2,'g.',k,h3,'b.')
xlabel('t');
ylabel('g(t)');
legend('g1(t)','g2(t)','g3(t)');
图像：
第 4页
M1-2
(1)代码：
b=[1];
a=[1 -1.845 0.850586];
w=linspace(0,2*pi,200);
y=filter(b,a,w);
plot(w,y);
ylabel('单位脉冲响应');
xlabel('Normalized frequency');
%b=[1];
%a=[1 -1.845 0.850586];
h=impz(b,a,21);
%figure(1);
stem(0:20,h);
ylabel('单位脉冲响应');
xlabel('Normalized frequency');
图像：
第 5页
(2)代码：
b=[1];
a=[1 -1.85 0.85];
w=linspace(0,2*pi,200);
y=filter(b,a,w);
plot(w,y);
ylabel('单位脉冲响应');
xlabel('Normalized frequency');
b=[1];
a=[1 -1.85 0.85];
h=impz(b,a,21);
figure(1);
stem(0:20,h);
ylabel('单位脉冲响应');
图像：
第 6页
M1-3
(1)代码：
x=firls(511,[0 0.4 0.404 1],[1 1 0 0]);
k=linspace(0,1,512);
stem(k,x);
图像：
(2)代码：
x=firls(511,[0 0.4 0.404 1],[1 1 0 0]);
k=linspace(0,1,512);
第 7页
stem(k,x);
k1=0.4*pi;
y1=x.*cos(k1*k);
A=abs(y1);
subplot(4,1,1);
plot(A);
k2=0.8*pi;
y2=x.*cos(k2*k);
B=abs(y2);
subplot(4,1,2);
plot(B);
k3=0.9*pi;
y3=x.*cos(k3*k);
C=abs(y3);
subplot(4,1,3);
plot(C);
k4=pi;
y4=x.*cos(k4*k);
D=abs(y4);
subplot(4,1,4);
plot(D);
图像：
第 8页
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