西南大学1073 《信号与系统》模拟测试资料

张老师 · 发表于 2020-5-9 03:36:43

1073 信号与系统
1.[单选题] 关于无失真传输的充要条件，下列叙述中正确的是（）。
A.系统的幅频特性为常数
B.系统的相频特性与频率成正比
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff50fe592_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff5107170_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
2.[单选题] <img width="68" height="21" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/> ( )
A.x(t)
B.-x(t)
C.-x(0)
D.x(0)
3.[单选题] 已知周期序列<img width="64" height="38" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>，其周期为 ( )
A.3
B.6
C.9
D.12
4.[单选题] LTI的含义是（）
A.因果稳定
B.线性稳定
C.线性因果
D.线性时不变
5.[单选题] 设系统函数<img width="120" height="24" style="width: 130px; height: 30px;" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>，则冲激响应为 ( )
A.{11-2}
B.{111}
C.1
D.0
6.[单选题] 利用Matlab求取系统的冲激响应，调用的函数是（）
A.step
B.impulse
C.lism
D.initial
7.[单选题] 对信号<img width="142" height="29" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/> 进行采样，最大采样间隔为 ( )
A.0.001
B.0.005
C.0.01
D.0.05
8.[单选题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff5150b13_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT"/>
A.0
B.1
C.不存在
D.无穷大
9.[单选题] 下列信号中属于数字信号的是（）。
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff50a34c7_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff50abbbe_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff50b35be_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff50bb295_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
10.[单选题] 设系统输入输出关系为y(t)=x(t)cos(t) ，则系统为（）。
A.因果稳定
B.非因果稳定
C.因果不稳定
D.非因果不稳定
11.[单选题] 关于数字频率，下列表达中错误的是（）
A.数字频率的高频为π附近
B.数字频率的低频为0和2π附近
C.数字频率为模拟频率对采样频率归一化的频率
D.数字频率的单位为Hz
12.[单选题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff5630b94_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT"/>
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff564420b_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
B.1
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff5650163_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
D.无法确定
13.[单选题] 序列 <img width="153" height="41" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/> ，其周期为（）
A.14
B.7
C.2
D.不是周期序列
14.[单选题] <img width="84" height="21" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/> (　）
A.１
B.f(0)
C.f(t)
D.f'(t)
15.[单选题] 已知输入<img width="93" height="25" src="data:image/png;base64,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" v:shapes="_x0000_i1026"/>，系统频率<img width="107" height="44" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>，则系统的输出的幅值为 ( )
A.1/2
B.1
C.2
D.3
16.[单选题] <img width="146" height="32" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>（）
A.0
B.1
C.-1
D.2
17.[单选题] 共轭对称的信号，其幅值与相位分别为（）
A.奇、偶函数
B.偶、偶函数
C.偶、奇函数
D.奇、奇函数
18.[单选题] 
 已知离散系统的结构图如图所示，则该系统的冲激响应为（ ）。
<span lang="EN-US" style="font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: "Times New Roman"; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"> <span lang="EN-US" style="font-family: "Times New Roman",serif; font-size: 10.5pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><img width="360" height="102" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>
A.h1(k)+h2(k)
B.h1(k)*h2(k)
C.h1(k)*h2(k)+1
D.h1(k)*h2(k)+δ(k)
19.[单选题] 设<img width="25" height="23" src="data:image/png;base64,R0lGODlhGQAXAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIABAAVAA4AhQAAAAAAAB0AHQAdMh0AMgAAMwAcSB0dSAAzWh0zWh1GbDIAHTMAACwAMjIAMjNdXTNbgEgcAEgdHVozHVozAFtIHUhIW0huW0huf11/f2xGHX9ZSH9uSH9/XWaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwZgQIBwSAQgiJOiUvhZRpbFA3QBHUKKV+FRGDAIGYMGkREIZAlECcABaFYBT2Jh6CUqiJG7kDPUFClFcUMCdERseFkAV1cPRUcYQ2wUAXoBR4BCGpZvRWhQkG91nFAJWENBADs=" v:shapes="_x0000_i1025"/>是带限信号，<img width="43" height="24" src="data:image/png;base64,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" v:shapes="_x0000_i1026"/> rad/s，则对<img width="44" height="30" src="data:image/png;base64,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" v:shapes="_x0000_i1027"/>进行均匀采样的最大间隔为 ( )
A.0.1s
B.0.2s
C.0.3s
D.0.5s
20.[单选题] 关于序列的插值，下列叙述错误的是（）
A.插值过程可分为两步，先补零，再经过低通滤波器
B.插值意味着抽样率的转换
C.零插值后的序列，频谱会被压缩并产生基带映像频谱
D.样点之间补零，意味着零阶插值
21.[单选题] 已知 <img width="126" height="38" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/>，设抽样频率为100Hz，则所得序列的数字频率为 ( )
A.0.1pi
B.0.2pi
C.0.3pi
D.0.4pi
22.[单选题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff77c8205_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff77da1ae_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff77edcbe_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff77f63d0_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff77fe1f9_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
23.[单选题] 关于稳定性的描述，下列叙述中错误的是（ ）。
A.稳定的充要条件是有界输入产生有界输出，简称BIBO
B.线性时不变系统的稳定性理论上与输入信号无关
C.稳定性指的是系统克服扰动恢复到平衡态的能力
D.冲激响应可以表征系统的稳定性
24.[单选题] 关于三个变换之间的关系，下列叙述错误的是（）。
A.若原信号收敛，虚轴上的拉氏变换就是傅里叶变换
B.s域的左半平面映射到z域的单位圆内部
C.从s域到z域的映射是单值映射
D.s域的右半平面映射到z域的单位圆外部
25.[单选题] 下列系统中，属于线性时不变系统的是（ ）。
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff7934397_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff793bdc7_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff79450e0_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff794e34c_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
26.[单选题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff78a74b3_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff78c554a_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff78cde54_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff78d59ea_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff78be193_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
27.[单选题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quiLk3cf58b9c_14ffaabe3af_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.中心频率点为ω0，幅值为原信号频谱幅值的一半
B.中心频率点为±ω0，幅值为原信号频谱幅值的一半
C.中心频率点为ω0，幅值为原信号频谱的幅值
D.中心频率点为±ω0，幅值为原信号频谱的幅值
28.[单选题] 对离散系统系统频率响应仿真，调用的函数是（ ）。
A.step
B.impulse
C.freqs
D.freqz
29.[单选题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff786db80_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.2
B.4
C.-2
D.-4
30.[单选题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quiLk3cf58b9c_14ffaafdef7_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.因果稳定
B.因果不稳定
C.非因果稳定
D.非因果不稳定
31.[单选题] 关于信号的分解，下列叙述正确的是（ ）
A.傅里叶级数是一致性意义下的正交分解
B.任意普通信号可分解为冲激函数的叠加，可用卷积形式来描述
C.信号能分解为实分量和虚部分量，故可对信号进行滤波
D.由于信号的可分解性，故在时域中可用冲激响应来表征系统
32.[判断题] 因果信号是稳定的信号。
A.对
B.错
33.[判断题] 线性相位，指的是系统的相频特性与频率成正比。
A.对
B.错
34.[判断题] 本课程中，信号一般指电信号。
A.对
B.错
35.[判断题] 非周期序列的频谱，是周期连续的频谱。
A.对
B.错
36.[判断题] 抽取与内插意味着抽样率的转换。
A.对
B.错
37.[判断题] 连续时间LTI系统稳定的充要条件是所有极点的实部小于等于零。
A.对
B.错
38.[判断题] 系统函数可由比值形式定义，故与输入信号的形式有关。
A.对
B.错
39.[判断题] 冲激响应只适用于LTI系统。
A.对
B.错
40.[判断题] 一个共轭对称的实信号，必为偶函数。
A.对
B.错
41.[判断题] 信号间断点处的微分，存在有冲激函数。
A.对
B.错
42.[判断题] 正弦信号是功率信号。
A.对
B.错
43.[判断题] 数字域中，带限信号的意思是指最高频率小于等于2π。
A.对
B.错
44.[判断题] 当周期趋于无穷大时，周期信号的频谱就由离散谱变为了连续谱。
A.对
B.错
45.[判断题] 周期信号的单边谱与双边谱中，直流分量的幅值相同。
A.对
B.错
46.[判断题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff7b0d8d9_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.对
B.错
47.[判断题] 竖式乘法可用来求有限长序列的卷积和。
A.对
B.错
48.[判断题] 若群延迟为常数，则数字滤滤器具有线性相位。
A.对
B.错
49.[判断题] 实际周期信号的频谱具有离散谐波性与收敛性。
A.对
B.错
50.[判断题] 频率响应反映了对输入频谱的加权作用。
A.对
B.错
51.[判断题] 从s域到z域映射，s平面虚轴与z平面单位圆，必须对应。
A.对
B.错
52.[判断题] 任意序列可看作单位脉冲序列移位加权的和。
A.对
B.错
53.[判断题] 系统函数可由比值形式定义，故与输入信号的形式有关。
A.对
B.错
54.[判断题] 无论连续还是离散的LTI系统，响应都可以分解为零输入与零状态响应之和。
A.对
B.错
55.[判断题] 对于DFS，时域与频域的周期都是N。
A.对
B.错
56.[判断题] 单位圆上的DTFT对应序列的z变换。
A.对
B.错
57.[判断题] 线性常系数的微分方程表示的系统是LTI系统。
A.对
B.错
58.[判断题] 可选择频谱包络线第一次的过零点作为信号的带宽。
A.对
B.错
59.[判断题] 冲激信号是偶函数。
A.对
B.错
60.[判断题] 离散因果LTI系统，特征根模值小于1时，响应分量收敛。
A.对
B.错
61.[判断题] 任意普通信号可分解为冲激函数的叠加，可用卷积形式来描述。
A.对
B.错
62.[判断题] 离散系统原点处的零极点，不影响频率特性幅值，只影响相位。
A.对
B.错
63.[判断题] 实序列的频谱，其幅值偶对称，相位奇对称。
A.对
B.错
64.[判断题] 系统为因果系统的充要条件是冲激响应是因果的信号。
A.对
B.错
65.[问答题] 周期信号的单边谱与双边谱的关系是什么？
A.
66.[问答题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff537317d_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT"/>
A.
67.[问答题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff531227e_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT"/>
A.
68.[问答题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff7e18110_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.
69.[问答题] <img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff57bb7c2_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT"/>
A.

		自动登录	找回密码
密码			注册

[杂七拉八] 西南大学1073 《信号与系统》模拟测试资料

相关帖子