|
1013 信号与系统
1.[单选题] <font face=& uot;宋体& uot;></font>
雅宝答案网答案资料下载,请参考帮助中心说明
<p style=& uot;color: rgb(0, 0, 0); font-size: 10.5pt; font-style: normal; font-weight: normal; margin-top: 0cm; margin-bottom: 0pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt left 232.1pt;& uot;><span style=& uot;font-family: 宋体; mso-bidi-font-size: 14.0pt;& uot;> 连续系统的结构图如图所示,系统的系统函数为(<span lang=& uot;EN-US& uot;><span style=& uot;mso-spacerun: yes;& uot;> </span></span>)。</span>
<p align=& uot;center& uot; style=& uot;text-align: center; color: rgb(0, 0, 0); font-family: & uot;Times New Roman& uot;,serif; font-size: 10.5pt; font-style: normal; font-weight: normal; margin-top: 0cm; margin-bottom: 0pt; tab-stops: 232.1pt;& uot;><span lang=& uot;EN-US& uot;><span style=& uot;font-size: 10px;& uot;></span><img width=& uot;248& uot; height=& uot;92& uot; src=& uot;data:image/png;base 4,R0lGODlh+ABcAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAgDzAFcAhgAAAAAAABAQEB4eHhISEgcHBwQEBAUFBRwcHAMDAxQUFAwMDAkJCR8fHxcXFwYGBhMTEwEBARoaGhYWFhkZGRERESAgIDw8PDAwMCQkJDs1OzExMScnJygoKCo Ki0tLTo Ojc3NzQ0NCwsLDU1NTMzMy8vLz8/Py4uLiIiIjk5OT09PSYmJldXV0BAQFVVVVFRUUpKSllZWUJCQkhISEZGRl1dXUxMTEREREVFRVpaWlhYWGZmZmBgYHNzc3d3d2p am5ubnJycmFhYXZ2dnt1e39/f4iIiI+Pj4aGhpeXl42NjZKSk enp +vr Ojo1S0tNnZ2cfHx8zMzN/f3/f39+/v1/Pz8////wECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwf/gACCg4SFhoeIiY GLQAWjpCPkpGUk5aVmI+Lm4cYmZ+XoaCUnKWmp ip o e 4AA +IAbK1tre4uZwuu axurS9m 3Cxca2vMeIv1nByoYYMM/T1IrJ1YPMuM1YxNjf1dfY2rfc4OfoxuLjvebU3unxuevU5Lbu09Hy+1f0gzEB8BnSUIjgInu1BAIIKG0Tj0I9FsHjR1GVv1MDDmVUhJDRKYUANioSSYhkxZO+AnBIdHGQjEUECm0YZLJQx0IBCgBotAlkzEUNB80YFBHRRJQVBQQMuNJQS5AAfv4ryZHT0pxHCYEc ki IJJeC+lDilTpVaaDWj4UJJAbgYBT/xPd1Ho2585DCjsMwjeTrjOFWcn2skC4sOHDhA3Uvb yZVB8Js0pPIAYMYLFVxMUGECYg0JnGoLuNcRVUIcYiDIo MwacWDBhGoAiEh1tu3aERdgLuCpZcyIL9nGJV Ih8IFuG/bfoE5AAMABGsr1Bt1tHC hPQi+ A8uffbC2BLTGV2Ke9CF8Me0p5I4dy9Z+cKNPhV 3Xrgz wFysa1Xvx/W1i1nlOJcKeM gJEoNX5hgnl1UBxbJWe1NMGOBCBRWyn1iv/CfYa4g4AKI/+4U2HDc11ZQNJx1iV4hI5hi0QWkbYihMi2Rd+MpF3LCXoCAEBFdddlUBc0hpCwUlpP8MUgVAHZCJgHiQeKwI0xIiPw pUZHNvFIjTazoyCKVioi5ypV4BTChkISYKQiOpkBFiAxLTajil4RIySWZHPaCJif0+dJOL4HeWFF/RSXiZip/FgNnKXIKo+eDtvSXJaCG DjIpKg02sujVp0zV cA ORpIoUKkmoiTwLQ1wCJGrIo eeA2pOo izmS vUIUkhIU+ Jwinp5yai 2LRE RYmetYs Tkv0FQH9LuVjIrMWig wiyupC1CAjnBWeIgBJSy1cph0SaAe+knRaJ1bWOig4o350FaQat uhIT0W4iue0+ CgwCiFDyKwZMgoEAvBhzsMMKYjJtKAVdNONL/VBv ChC/XRny5bd8hizpUsi+O4h 5kgj5IZhAYytyDC3gy4nrbJcyKWIiISzQCDH1LMsFHcLwIaaCoUfN/0SI wgL//stCsYBIDjzkTaR3POUT t9TFCH4KzK sCzPTWZOsisSur+prK nmW1fYtJFgldtO40P323QCU8AAGIYTwgAkx94x32SM0UQUWiGPhRAgx2z341jRYkfjkWAhRkWxVP 15ISgcnngUUUw+BEUBOYD5IY5vHnMGUlA+xRSTU5ECKlGHx9M9V5nep+ Q0A5F 9TTsPtkJ HAfHO npN ryHTMPkMMBwwQXRJ44E1Yvp9MKmzXXfnAKzN 85/w5ETP1 E08Ej3gSEXjv/lUN54 ZJgGL/zgMv ufuBLYLyaACK oS1M2ZT/NSSB/sJucDugWH8bJYikDlFUBBzcBKlDuCleYXBUo0D8FONAWEYTXBAe3g99RbgkWOQfzRggbJpgQcVAQmeBYKB4QDEFyGiwCAEW2QhoKpgIuMIIQYbA02MzQh2RCwdN iETBLOxnR2wibLp2EiZK8SQuCAD9YBbFK LELE zohf5US2fdXGM/LjAUhDwMzF+431wjGMZBVMeKu1jjPRKBx F0SyfuREbfzRFIHOhx uwkYtQ1CMd +LHN pwioxEpBkVSZbCGAABhPlgyAY5DU5uwv+Tx3LaHrtBSdhsax+gPIaYOiAnJhUiSEAh0ynjMcp gKiIYMrUMKg0y3ik0hhiWpRCCGCxa8lSlLK4AK4SUbRf1S9r4ullOnoYkC12kkIvwYc5CECAAyn mIl8hQXOYs1iTEpY5ohM5ky5xAcuppy CCaY CQt 1mrTeD0GQvkyM9+yjECzlTbfWahiPb58 D+lKbTsldLCR iB1LxS LMESsboQ NSBmn8fLBCZGw8mT2yRJIGorRBxKoGheiT0UndClLfbOkUuwZfYrWTACQFKYwe9kGAkC0LZUJp0084 W+Bg2gIvGXiEC UT9Uy VOUKkOdeoEb8oJ kpVMFARNeZVC2jV8WzVfggN 8yuGAgAOw==& uot; v:shapes=& uot;_x0000_i1025& uot;/></span>
<font face=& uot;宋体& uot;></font>
A.H1(s) H2(s) - H3(s)
B.h1(t) *h2(t)+h3(t)
C.H1(s)H2(s) + H3(s)
D.h1(t) *h2(t)-h3(t)
2.[单选题] <font face=& uot;宋体& uot;></font>
<p style=& uot;color: rgb(0, 0, 0); font-size: 10.5pt; font-style: normal; font-weight: normal; margin-top: 0cm; margin-bottom: 0pt; mso-list: l0 level1 lfo1; tab-stops: list 4 .5pt left 11 .4pt;& uot;><span style=& uot;font-family: 宋体; mso-bidi-font-size: 14.0pt;& uot;> 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=& uot;EN-US& uot;><span style=& uot;mso-spacerun: yes;& uot;> </span></span>)。</span>
<font face=& uot;宋体& uot;></font><span lang=& uot;EN-US& uot; style=& uot;font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;><span style=& uot;mso-spacerun: yes;& uot;> </span></span><span lang=& uot;EN-US& uot; style=& uot;font-family: & uot;Times New Roman& uot;,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;& uot;></span>
A.h1(k)+h2(k)
B.h1(k)*h2(k)
C.h1(k)*h2(k)+1
D.h1(k)*h2(k)+δ(k)
3.[单选题] <span style=& uot;font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 12.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: & uot;Times New Roman& uot;; mso-hansi-font-family: & uot;Times New Roman& uot;;& uot;>已知</span><span style=& uot;font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;>输入<span lang=& uot;EN-US& uot;><span style=& uot;top: 5pt; position: relative; mso-text-raise: -5.0pt;& uot;></span></span>,系统频率<span lang=& uot;EN-US& uot;><span style=& uot;top: 14pt; position: relative; mso-text-raise: -14.0pt;& uot;></span></span>,则系统的输出的幅值为</span> ( )
A.3
B.1/2
C.2
D.1
4.[单选题] <font face=& uot;宋体& uot;></font>
<p style=& uot;color: rgb(0, 0, 0); font-size: 10.5pt; font-style: normal; font-weight: normal; margin-top: 0cm; margin-bottom: 0pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt left 11 .4pt;& uot;><span style=& uot;font-family: 宋体; mso-bidi-font-size: 14.0pt;& uot;> 某滤波器的幅频特性曲线如图,则<span lang=& uot;EN-US& uot;>20dB</span>阻带起始频率约为(<span lang=& uot;EN-US& uot;><span style=& uot;mso-spacerun: yes;& uot;> </span></span>)<span lang=& uot;EN-US& uot;>rad/s</span>。</span>
<font face=& uot;宋体& uot;></font><span lang=& uot;EN-US& uot; style=& uot;font-family: & uot;Times New Roman& uot;,serif; font-size: 10.5pt; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;></span>
A.3
B.0.5
C.1
D.2
5.[单选题] LTI的含义是( )
A.线性因果
B.线性稳定
C.因果稳定
D.线性时不变
.[单选题] <span style=& uot;font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;>若数字滤波器在<span lang=& uot;EN-US& uot;><span style=& uot;top: 4pt; position: relative; mso-text-raise: -4.0pt;& uot;></span></span>两点处的幅值为(<span lang=& uot;EN-US& uot;>1</span>,<span lang=& uot;EN-US& uot;>1</span>),则该滤波器为(<span lang=& uot;EN-US& uot;><span style=& uot;mso-spacerun: yes;& uot;> </span></span>)</span>
A.A.lp
B.bp
C.bs
D.hp
1.[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.样点之间补零,意味着零阶插值
D.零插值后的序列,频谱会被压缩并产生基带映像频谱
8.[单选题] 已知 <span lang=& uot;EN-US& uot; style=& uot;color: red; font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;><span style=& uot;top: 12pt; position: relative; mso-text-raise: -12.0pt;& uot;></span></span>,设抽样频率为100Hz,则所得序列的数字频率为 ( )
A.0.4pi
B.0.3pi
C.0.2pi
D.0.1pi
9.[单选题] <span style=& uot;font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;><span style=& uot;mso-spacerun: yes;& uot;> </span>已知周期序列<span lang=& uot;EN-US& uot;><span style=& uot;top: 5pt; position: relative; mso-text-raise: -5.0pt;& uot;></span></span>,其周期为</span> ( )
A.9
B.
C.12
D.3
10.[单选题] <span style=& uot;font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;>设<span lang=& uot;EN-US& uot;><span style=& uot;top: 5pt; position: relative; mso-text-raise: -5.0pt;& uot;></span></span>,则<span lang=& uot;EN-US& uot;><span style=& uot;top: 5pt; position: relative; mso-text-raise: -5.0pt;& uot;></span></span></span> ( )
A.2
B.1
C.0
D.-3
11.[单选题] 共轭对称的信号,其幅值与相位分别为( )
A.C.偶、偶函数
B.奇、偶函数
C.偶、奇函数
D.奇、奇函数
12.[单选题] 序列 <span lang=& uot;EN-US& uot; style=& uot;color: red; font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;><span style=& uot;top: 12pt; position: relative; mso-text-raise: -12.0pt;& uot;></span></span> ,其周期为( )
A.1
B.2
C.不是周期序列
D.14
13.[单选题] <span style=& uot;font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;>对信号<span lang=& uot;EN-US& uot;><span style=& uot;top: 4pt; position: relative; mso-text-raise: -4.0pt;& uot;></span><span style=& uot;mso-spacerun: yes;& uot;> </span></span>进行采样,最大采样间隔为</span> ( )
A.0.001
B.0.005
C.0.05
D.0.01
14.[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=10 uiLk3cf58b9c_14ff1934391_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff193bdc1_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff19450e0_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff194e34c_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
15.[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雅关
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
1 .[单选题]
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff18be193_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff18c554a_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff18cde54_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff18d59ea_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
11.[单选题]
A.2
B.4
C.-2
D.-4
18.[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
19.[单选题]
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff11da1ae_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff11edcbe_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff11f 3d0_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff11fe1f9_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
20.[单选题]
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff111df5f_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff1191a42_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff11a2b34_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLk3cf58b9c_14ff11adf50_OUL&rc=oVdA41x%2B4VctsHYg3UjY2b1YYwf GaE2'/>
21.[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
22.[单选题]
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLi3cf58b9c_14ff5 4420b_OUL&rc=oVdA41x%2B4VctsHYg3UjY2cV%2FVU vsuPT'/>
B.1
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLi3cf58b9c_14ff5 501 3_OUL&rc=oVdA41x%2B4VctsHYg3UjY2cV%2FVU vsuPT'/>
D.雅法确定
23.[单选题] 下列系统中,不属于线性系统的是( )。
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLi3cf58b9c_14ff5 0854f_OUL&rc=oVdA41x%2B4VctsHYg3UjY2cV%2FVU vsuPT'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLi3cf58b9c_14ff5 1240d_OUL&rc=oVdA41x%2B4VctsHYg3UjY2cV%2FVU vsuPT'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLi3cf58b9c_14ff5 1a3d5_OUL&rc=oVdA41x%2B4VctsHYg3UjY2cV%2FVU vsuPT'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10 uiLi3cf58b9c_14ff5 21e1d_OUL&rc=oVdA41x%2B4VctsHYg3UjY2cV%2FVU vsuPT'/>
24.[单选题] 下列叙述正确的是( )。
A.各种离散信号都是数字信号
B.数字信号的幅度只能取0或1
C.将模拟信号采样直接可得数字信号
D.采样信号经保持、滤波后可得模拟信号
25.[单选题]
A.LP
B.HP
C.BP
D.BS
2 .[单选题] <span style=& uot;font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;>设<span lang=& uot;EN-US& uot;><span style=& uot;top: 5pt; position: relative; mso-text-raise: -5.0pt;& uot;></span></span>是带限信号,<span lang=& uot;EN-US& uot;><span style=& uot;top: 5pt; position: relative; mso-text-raise: -5.0pt;& uot;></span><span style=& uot;mso-spacerun: yes;& uot;> </span>rad/s</span>,则对<span lang=& uot;EN-US& uot;><span style=& uot;top: 5pt; position: relative; mso-text-raise: -5.0pt;& uot;></span></span>进行均匀采样的最大间隔为</span> ( )
A.0.2s
B.0.5s
C.0.1s
D.0.3s
21.[单选题] <span lang=& uot;EN-US& uot; style=& uot;font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;><span style=& uot;top: 5pt; position: relative; mso-text-raise: -5.0pt;& uot;></span></span> <span lang=& uot;EN-US& uot; style=& uot;font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-family: & uot;Times New Roman& uot;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;& uot;><span style=& uot;top: 5pt; position: relative; mso-text-raise: -5.0pt;& uot;></span></span> ( )
<font face=& uot;宋体& uot;>
</font>
A.D.x(t)
B.-x(t)
C.x(0)
D.-x(0)
28.[判断题] 当周期趋于雅穷大时,周期信号的频谱就由离散谱变为了连续谱。
A.正确
B.错误
29.[判断题] 离散因果LTI系统稳定的充要条件是所有极点的模值小于1。
A.正确
B.错误
30.[判断题] 竖式乘法可用来求有限长序列的卷积和。
A.正确
B.错误
31.[判断题] 正弦信号是功率信号。
A.正确
B.错误
32.[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.正确
B.错误
33.[判断题] 若群延迟为常数,则数字滤滤器具有线性相位。
A.正确
B.错误
34.[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.正确
B.错误
35.[判断题] 一个共轭对称的实信号,必为偶函数。
A.正确
B.错误
3 .[判断题] 信号间断点处的微分,存在有冲激函数。
A.正确
B.错误
31.[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.正确
B.错误
38.[判断题] 单位圆上的DTFT对应序列的z变换。
A.正确
B.错误
39.[判断题] 原信号收敛时,虚轴上的拉氏变换就是信号的傅里叶变换。
A.正确
B.错误
40.[判断题] 对于DFS,时域与频域的周期都是N。
A.正确
B.错误
41.[判断题] 周期信号谐波分量的频率,都是基频的整数倍。
A.正确
B.错误
42.[判断题] 线性常系数的微分方程表示的系统是LTI系统。
A.正确
B.错误
43.[判断题] 冲激信号是偶函数。
A.正确 天大 联系 Q 1 129 021更多答案请进 ybaotk.com
B.错误
44.[判断题] 抽取与内插意味着抽样率的转换。
A.正确
B.错误
45.[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.正确
B.错误
4 .[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.正确
B.错误
41.[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.正确
B.错误
48.[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.正确
B.错误
49.[判断题] 一个域离散,对应另一个域的周期延拓。
A.正确
B.错误
50.[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.正确
B.错误
51.[判断题] 冲激响应只适用于LTI系统。
A.正确
B.错误
52.[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.正确
B.错误
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.正确
B.错误
54.[判断题] 频率响应反映了对输入频谱的加权作用。
A.正确
B.错误
55.[判断题] 非周期序列的频谱,是周期连续的频谱。
A.正确
B.错误
5 .[判断题] 雅论连续还是离散的LTI系统,响应都可以分解为零输入与零状态响应之和。
A.正确
B.错误
51.[判断题] 冲激响应是冲激函数作用下的零状态响应。
A.正确
B.错误
58.[判断题] 任意序列可看作单位脉冲序列移位加权的和。
A.正确
B.错误
59.[判断题] 因果信号是稳定的信号。
A.正确
B.错误
0.[判断题] 本课程中,信号一般指电信号。
A.正确
B.错误
1.[问答题] 周期信号的单边谱与双边谱的关系是什么?
A.
2.[问答题]
A.
3.[问答题]
A.
4.[问答题]
A.
5.[问答题] <p style=& uot;margin-top: auto; margin-bottom: auto; text-align: left;& uot;><span style=& uot;font-size:10px;font-family:宋体& uot;>求图示信号的傅里叶变换。</span>
A.
雅宝答案网 附件是答案,请核对题目下载 |
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有帐号?立即注册
x
上一篇:10 《 房屋建筑学》20秋西南大学在线作业答案参考下一篇:1014《 液压与气动控制》20秋西南大学在线作业答案资料
|