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1073 信号与系统
1.[单选题]<font face="宋体"></font>
奥鹏作业答案可以联系QQ 761296021
<p style="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 46.5pt left 116.4pt;"><span style="font-family: 宋体; mso-bidi-font-size: 14.0pt;"> 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"><span style="mso-spacerun: yes;"> </span></span>）。</span>
<font face="宋体"></font><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 style="mso-spacerun: yes;"> </span></span><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,R0lGODlhaAFmAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALA0ADABMAVgAhwAAAAAAAAAAHR0AABYWFhoaGhsbGxcXFxwcHBAQEAYGBhMTEwQEBAcHBwwMDAUFBQoKChQUFBISEgAAMwAAOgAcSB0dSAAAZh0zWgAzWgA6kB1GbABmZgBmkABmtjMAADIAMjoAOjoAZiEhITw8PCwsLD8/PygoKDc3NzMzMyAgID4+PjExMSQkJC4uLjAwMC8vLy0tLTU1NTQ0NCoqKjY2NjMzWzo6kDNGbjVbbjNbgDpmtjqQ20gdHUgcAFozAFozHVszM0YzRltIHVVVVUBAQFdXV0FBQVFRUUhISF1dXVhYWEVFRUhIW0xMTFpaWkZGRk5OTkdHR19fX0REREhZf1tuSF1/f0huf0Rubll/blluf2YAAGYAOmYAZmY6kGxGHW5GM25dXX9/XX9uSG5/WW5uWW5uRG5ubnNzc3d3d39/f2pqanJycmlpaWZmZmBgYGJiYnBwcGZmtm6AbmaIiGaQ22a2/5A6AJA6OoBbM4iIZpCQZoiIiIODg5KSkoqKioWFhZDb/7ZmALZmZre3t6enp7bbkLb//9uQOtuQZt/f39fX19v///+2Zv/bkP//tv//2+/v7/f39////wECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwj/AAEIHEiwoMGDCBMqXMiwocOHECNKnEixosWLGBd+CDDwxwSCAQRkJPgjAEc9ASoUNKlypMuXMGPKnEmzJkEQBW0U7GETYcueQIMKHUq0KE6FPF/+KIjl4M+iUKNKnTrVx0cAFgAcHZgFAEeBSSmCCbABwA+VP8oKxOnDJMGnVOPKnUu3IpCbBIXEJANgSMeBfH3WHUy48MIiABAX1QEAh1bAA0QSDFvRR0G1An8wLgjXsOfPUwmMQLKmdJICBojqfTxw8+SMrpcKbPuVM+jbuIUiOeBnEaXfwCkxYoNACVDJrAEEETggw0DKFCmnFZgVAOaBnXNr336RxBJJwcP//15UhAnN1XiRXlyetYrZgWX1OOVOv/7EEn/E6//dhsTMjQVtdN1AYyE30Vc+wCUbAB8YCEB29kUooUAmALLfhW44MWFCCyoE4YYg5mZEEheWeEKIBk230IcotljYCIyUeGEhJbiYmVsIsWTjjp89IWOJKPAo5JCFHZBQCob8eGEgikGVQAAqECnlkCYFYGRBCkyi5H6MpBbVk1VGOeWYIVZZ5ZUALLDlfpMoIBWYZkJJEGJ0JmZnnXjeqWeefO6pJwt+9ilooIQOamihiB6qaKKMLupoo4XGaWYCLay5HwOSZqrpppx2amYDSAj06KiQIuZCAqSmWuqqqrbK6quuPv+6KaWW6ufAm5I28IJhYpLpa0KSAgCFQGrWGlybuJqkK2i9/uosSCYdMCxBWRoLXJdvLotbs88+K21CSVpLSSDdTsRtuegW5KO4Qab70LnupgujtTTG6xC89pZLorEn5ssQvv4+a6GlcAT8r8HxwjCwkm5IgbBCAD/s63cykicxxBe7y5tv4g2HQMYJRQzylEeIRpppqCUxMkIirzwlEV7JYITLIdOc7gsBNGlzQS3vLCSmCfhsUM9C21hl0QQRjXSIJVTp39JKL70hpiYFDbXUY8YpddRY29e0mU8XzXXX9FFdpdVik01lsEiPrTZ9aF/99pBxtz033V27fXdudaf/vfeOfQut99+gBe7z4IR7ZvjOiCde2OI2N+74YJDTLPnkdFXu8uWYy6X5ypx3TtXnIy9Qk6eop476xzQ9oPrrsFcJQU2kgxy6QUisK+7u+i1CQE0o8C68eLXJVHvGtxuk+/DC+w4889AXH9PxFydPUO7QD+88TcFnL7z0MFEvsfUELe+9sdvP1P354oL/kvgPky8Q9uxbm75M69dfq/suwY+w/AIxn/6UdL+Y5G+AW+LfSPxnMADSD4FbKiBMDghBGSkwIwwMGAABIMAK7keCL6GgB/dzQYxk0F8O7OBvBhEAD+wnEngwiQYaQQlIcKGF4UmEDGn4wd9x70IsdGGJ/2C4wxreUIjA0WEAZqifEl7khPnaoAp/k4g7vBAPPAgPDLMonkQwsYfPu1AVZbRFLWJRP17kYXicaBEo2iuFF4pEHgRxRS4CBxJdoGMXv9g7H6ovjnMk4xmDg0c95pCPwWFjRdwYLyle6BE3UKMZ7fgbRyAyiZcMDghdIsLfQFKS+iljcCwJSipmkhKKpAgj3QXH/SQii44IwAUQERxRAmcQPLChSZCYxgttciSdpMQrKRHLWYZykLfM5Q1xaMpSopJ2ebOICiKgM3UB8Q6O8IAcDUkJW9Ywj5QgBC2D00swVuQFkAvmILCpzUCKx5uFDOc4MenMVE5klelqXJWoWf+QB4YHEl44xA4o8QgRzLObyCSoQde5R2eOx48TwVnVAPCGgnQSoAJV6EGB482CIoKhh6wnNLGGOBVIKgHt4uB+HMGBL9AwES6E6W+8mYgO4CGT5ezjRSR1q4F0kqUuFaY2Y0gBQ9LUpjg9pT0lgk90zS5KUAVAVKcq1aqqoAGzooEKE2FMSqxTh0K0JQwpwIeiNtSXDaCqWq3KVgds6lY1cGVX16kIOg7ii2LFA1nNGtImsnWtgP0rWxEQAdEl5ACZ6qlK3+lOgNJSpgi14yNCIAgbWrGvH5SARVqQKW2JcJu/cSxwPDpTZE62sly4LDmVatioTAoABZtfBz9ZSQ//OOIOkLUlKb3qAUjMYbUOpcQvGyJRkzhgVwQRIW2JadvLLle3TBxEb39LT7+2ligmXVwHh0lFHOYWmbispCwPmlPxDLchAXDADBAiQu4Kk5nEtKMtw0vM8QLXutcdSkUR4s8ffZeSMipveM67kJkpJJj7gURQSwvgEgn4N0vNr02miMawJjTAp3xoGNckzlpe2MGslbBc+htgCxdRjCfW6Q/XNMZH2KG0KUZjjIETYRHPhMLhiSV8vUdgiyA4PCw0CV+9V2Mbw4TEIzQvRA2Y5B8V2cgvwXGSe1yRHzf5yVDOCJKbDBwqU8TKScZyljEi5RF6eSJgHqGYx1yRLXNZarhLnuCbL7RmNlOkzB48s0TS7ME62zkibuayniPC5wr6+c8QwXMFBw2RQkPw0IhuSKCbzOiHOBqBkI40Q2JQmk57+tOgDrWoRw1qOcT5JQggtapXzepPZ1rTh4GVrAdVk2HFatZ6ChXCAgIAOw==" v:shapes="_x0000_i1025"/></span>
A.h1(k)+h2(k)
B.h1(k)*h2(k)
C.h1(k)*h2(k)+1
D.h1(k)*h2(k)+δ(k)
2.[单选题]<span style="font-family: 宋体; font-size: 10.5pt; mso-bidi-font-size: 12.0pt; 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; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">已知</span><span 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;">输入<span lang="EN-US"><span style="top: 5pt; position: relative; mso-text-raise: -5.0pt;"><img width="93" height="25" src="data:image/png;base64,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" v:shapes="_x0000_i1026"/></span></span>，系统频率<span lang="EN-US"><span style="top: 14pt; position: relative; mso-text-raise: -14.0pt;"><img width="107" height="44" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/></span></span>，则系统的输出的幅值为</span> ( )
A.3
B.1/2
C.2
D.1
3.[单选题]<font face="宋体"></font>
<p style="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 116.4pt;"><span style="font-family: 宋体; mso-bidi-font-size: 14.0pt;"> 某滤波器的幅频特性曲线如图，则<span lang="EN-US">20dB</span>阻带起始频率约为（<span lang="EN-US"><span style="mso-spacerun: yes;"> </span></span>）<span lang="EN-US">rad/s</span>。</span>
<font face="宋体"></font><span lang="EN-US" style="font-family: "Times New Roman",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;"><img width="451" height="136" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/></span>
A.3
B.0.5
C.1
D.2
4.[单选题]<span 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;">设系统函数<span lang="EN-US"><span style="top: 5pt; position: relative; mso-text-raise: -5.0pt;"><img width="120" height="24" style="width: 130px; height: 30px;" src="data:image/png;base64,R0lGODlheAAYAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAwBzABEAhQAAAAAAAB0AHQAAHR0AAAAAMx0AMgAcSB0dSAAzWh0zWh1GbDMAADIAHTIAMjNbgEgcAEgdHUceM1ozHVozAFtISF1/f0huf1luf2xGHW5GRm5dXX9ZWX9/XX9uSH9uWW6AbmaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwb/QIBwSCwaj8ikcpksMJ9KRmABrVqv2CxTI3Rov+CnJAydkM9owDgNpQTeD4AbDhAt41fB5Qt5Bw5qV2+ASn5DeEMZhEKKQwhLDYIDbFcKQgwJVZlGVESIiEh2WHtoAVUbiVWGRJFEAkNeRH1vTkIGV61QswG1aJsAu71KIn6rdUkURaBPpMp3aclG0U+dQhDVi0TT1rLFb79CuVXbS7t+4MhV4gCvjEfkQtVQzeZvR8uUclbCANnZ+kYgdPOGbt0SePkQKpEHgGGzaRzCNPN0j9IngAAiLjknxE+1bcWKoFtCwN6TYiOzFKsVEs0tJRHyyZyp5J8smjhzDrEkTadPAytBAAA7" v:shapes="_x0000_i1025"/></span></span>，则冲激响应为</span> ( )
A.{1 1 -2}
B.1
C.{1 1 1}
D.0
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
6.[单选题]<span 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;">若数字滤波器在<span lang="EN-US"><span style="top: 4pt; position: relative; mso-text-raise: -4.0pt;"><img width="41" height="22" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/></span></span>两点处的幅值为（<span lang="EN-US">1</span>，<span lang="EN-US">1</span>），则该滤波器为（<span lang="EN-US"><span style="mso-spacerun: yes;"> </span></span>）</span>
A.A. lp
B.bp
C.bs
D.hp
7.[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.initial
D.lism
8.[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
9.[单选题]已知 <span lang="EN-US" style="color: red; 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 style="top: 12pt; position: relative; mso-text-raise: -12.0pt;"><img width="126" height="38" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/></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
10.[单选题]<span 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 style="mso-spacerun: yes;"> </span>已知周期序列<span lang="EN-US"><span style="top: 5pt; position: relative; mso-text-raise: -5.0pt;"><img width="64" height="38" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/></span></span>，其周期为</span> ( )
A.9
B.6
C.12
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]<span lang="EN-US" style="color: red; 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 style="top: 7pt; position: relative; mso-text-raise: -7.0pt;"><img width="146" height="32" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/></span></span>（ ）
A.B.-1
B.0
C.2
D.1
13.[单选题]<span lang="EN-US" style="color: blue; 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 style="top: 5pt; position: relative; mso-text-raise: -5.0pt;"><img width="84" height="21" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/></span></span> ( ）
A.f'(t)
B.１
C.f(0)
D.f(t)
14.[单选题]<span 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;">对信号<span lang="EN-US"><span style="top: 4pt; position: relative; mso-text-raise: -4.0pt;"><img width="142" height="29" src="data:image/png;base64,R0lGODlhjgAdAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIABgCKABMAhQAAAAAAAB0AAAAAHR0AHR0AMgAAMwAcSB0dSAAzWh0zWh1GbDMAADIAHTIAMjMeRyQkADIsADMzWzNGbjNbgEgdHUgcAEceM1ozHVozAE4zAE9HHFtIHUhIW1lZf0ZGbkhZf0huf11/f1luf2xGHW5GM25GRn9uSH9/XW5/WX9uWWpqam6AbmaIiIBbM4iIZgECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwECAwb/QIBwSCwaj8ikcjkkBQLMqHRKrVqv0gp2y+0SL95rovoIY8FWh7Jstkqi6vaVTQ0tx3Kj4FksRDFRT3hDGXxeg1GISBkUeUQHhAZCkEwuRYJFlBaDGZqKVhlTWkYkRSeOQ4oIAG9YpUQDRAR2LgN2QgRVr0OnUqtGkkWjeaGkTwGxSr9FnIgWQhnOC1TBRMNCDE/TmIrHhkPTjp9LxwYbR7tC4UOQz0TFQ95PyQDyRevYRvBE7kXpcnukMFhnAQK+VEMY+IOkMBM0eU8oCelH5B8AiwAO9joy7iFEKFICVEsiUUgEdEQYNHoEoGGTIY0ACVnJK8knAfQA7AOHElXC0JJKImo4KGSQSyEkGB4EKmQZEaIXjZwQcFDRtXs+h+QKGmBMKIz/lgKgqLNIo51Crj41woFpEafWlBT62JGVET+LSjZoypFQkX7ShvzaawTukGuWcAnDKgREzaw8keBll+RfzlkAat0CsLXlEEkmGANwLGSjEQtV/fKFDBIhEhLVLLQG8Klkp4mcNP1E+g2aYCR7IE19QlPI5ohFFOQJ7eJY8SPZkNlpPczJsUtdi8wdojneEeRElFOhcyQO5C7kzyMxP8V0ETTqu4iPbwQ+gCAAOw==" v:shapes="_x0000_i1025"/></span><span style="mso-spacerun: yes;"> </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
15.[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
16.[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
17.[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
18.[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'/>
19.[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
20.[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_14ff78be193_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff78c554a_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff78cde54_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff78d59ea_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
21.[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
22.[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
23.[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'/>
24.[单选题]<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quiLk3cf58b9c_14ff777c79c_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff777df5f_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff7797a42_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff77a2b34_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff77adf50_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2'/>
25.[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
26.[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=10quiLi3cf58b9c_14ff560854f_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
B.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff561240d_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
C.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff561a3d5_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
D.<img src='http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff5621e1d_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT'/>
27.[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
28.[单选题]<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff5123220_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT"/>
A.LP
B.HP
C.BP
D.BS
29.[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
30.[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'/>
31.[单选题]<span 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;">已知序列<span lang="EN-US"><span style="top: 14pt; position: relative; mso-text-raise: -14.0pt;"><img width="107" height="45" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/></span></span>，则<span lang="EN-US"><span style="top: 5pt; position: relative; mso-text-raise: -5.0pt;"><img width="53" height="24" src="data:image/png;base64,R0lGODlhNQAYAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAIAAwAxABEAhAAAAAAAAAAAHQAAFx0AHQAAMwAcSAAzWh1GbCgZADMAADIAMjIyADMzWzNbgEgcAEgdHUceM1ozAEhuf11/f2xGHX9/XX9uSG6AbmaIiIBbM4iIZgECAwECAwECAwECAwWdICCOQCCIDqmubOuSjRggb23feK5XQT/2g0TPIHoQVUYRL3DUaQSTkWJ0kDJViiupqXuMIiMvqcJVcsm6LQCiqqpX5XLOhHSbV+h3GjBd2UVyAHEqPYU+KwsMfwBiI3ljZ4E1CwAVBX4qgYM6lCIEdZB4myIShoV2lyQ0JIuamThZMyKxJ0UktLc9tZWSeyKLOL17D8A3wntDc1o1IQA7" v:shapes="_x0000_i1026"/></span></span></span> （ ）
A.12
B.9
C.3
D.6
32.[单选题]<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 style="top: 5pt; position: relative; mso-text-raise: -5.0pt;"></span></span> <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 style="top: 5pt; position: relative; mso-text-raise: -5.0pt;"><img width="68" height="21" src="data:image/png;base64,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" v:shapes="_x0000_i1025"/></span></span> ( )
<font face="宋体">
</font>
A.D.x(t)
B.-x(t)
C.x(0)
D.-x(0)
33.[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.正确
B.错误
34.[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
35.[判断题]正弦信号是功率信号。
A.正确
B.错误
36.[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
37.[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
38.[判断题]一个共轭对称的实信号，必为偶函数。
A.正确
B.错误 答案可以联系微信761296021
39.[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
40.[判断题]利用几何作图的方法，可以由零极点的分布绘制频率响应曲线。
A.正确
B.错误
41.[判断题]单位圆上的DTFT对应序列的z变换。
A.正确
B.错误
42.[判断题]理想模拟滤波器都是物理上不可实现的滤波器。
A.正确
B.错误
43.[判断题]对于DFS，时域与频域的周期都是N。
A.正确
B.错误
44.[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
45.[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
46.[判断题]冲激信号是偶函数。
A.正确
B.错误
47.[判断题]抽取与内插意味着抽样率的转换。
A.正确
B.错误
48.[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
49.[判断题]线性相位，指的是系统的相频特性与频率成正比。
A.正确
B.错误
50.[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
51.[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
52.[判断题]冲激响应只适用于LTI系统。
A.正确
B.错误
53.[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
54.[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
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
56.[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.正确
B.错误
57.[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
60.[判断题]本课程中，信号一般指电信号。
A.正确
B.错误
61.[问答题]周期信号的单边谱与双边谱的关系是什么？
A.
62.[问答题]<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLk3cf58b9c_14ff7b63b87_OUL&rc=oVdA47x%2B4VctsHYg3UjY2b7YYwf6GaE2"/>
A.
63.[问答题]<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff57bb7c2_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT"/>
A.
64.[问答题]<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff537317d_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT"/>
A.
65.[问答题]<img src="http://fs.eduwest.com/filesys/image.jsp?fc=10quiLi3cf58b9c_14ff531227e_OUL&rc=oVdA47x%2B4VctsHYg3UjY2cV%2FVU6vsuPT"/>
A.
附件是答案，核对题目下载
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