2024知到答案 数字信号处理（山东建筑大学） 完整智慧树网课章节测试答案
绪论 单元测试
1、多选题：
数字化信息对我们生活有哪些影响？
选项：
A:数字化图书馆
B:数字化校园
C:数字化社区
D:数字化厨房
答案: 【数字化图书馆;
数字化校园;
数字化社区;
数字化厨房】
第一章 单元测试
1、单选题：
描述离散时间系统的数学模型是（ ）。
选项：
A:差分方程
B:微分方程
C:代数方程
D:状态方程
答案: 【差分方程】
2、单选题：
已知离散时间LTI系统的激励 .w64852499023s .brush0 { fill: rgb(255,255,255); } .w64852499023s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499023s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499023s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499023s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499023s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) ( n nu n x = ，单位脉冲响应 .w64852499093s .brush0 { fill: rgb(255,255,255); } .w64852499093s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499093s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499093s .font1 { font-size: 373px; font-family: Symbol, serif; } .w64852499093s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499093s .font3 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64852499093s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) 2 ( ) ( - = n n h d 则系统的零状态响应为（ ）。
选项：
A:.w64852499040s .brush0 { fill: rgb(255,255,255); } .w64852499040s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499040s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499040s .font1 { font-size: 373px; font-family: Symbol, serif; } .w64852499040s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499040s .font3 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64852499040s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) 2 ( ) 2 ( - - n n d
B:.w64852499059s .brush0 { fill: rgb(255,255,255); } .w64852499059s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499059s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499059s .font1 { font-size: 373px; font-family: Symbol, serif; } .w64852499059s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499059s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) 2 ( - n nu
C:.w64852499075s .brush0 { fill: rgb(255,255,255); } .w64852499075s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499075s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499075s .font1 { font-size: 373px; font-family: Symbol, serif; } .w64852499075s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499075s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) 2 ( ) 2 ( - - n u n
D:.w64852499049s .brush0 { fill: rgb(255,255,255); } .w64852499049s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499049s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499049s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499049s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499049s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) 2 ( n u n -
答案: 【.w64852499075s .brush0 { fill: rgb(255,255,255); } .w64852499075s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499075s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499075s .font1 { font-size: 373px; font-family: Symbol, serif; } .w64852499075s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499075s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) 2 ( ) 2 ( - - n u n】
3、单选题：
两个离散时间线性时不变系统的单位脉冲响应分别为 .w64852499027s .brush0 { fill: rgb(255,255,255); } .w64852499027s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499027s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499027s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499027s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499027s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( 1 n h 和 .w64852499097s .brush0 { fill: rgb(255,255,255); } .w64852499097s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499097s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499097s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499097s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499097s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( 2 n h ，当这两个系统级联时，其级联后系统的单位脉冲响应 .w64852499079s .brush0 { fill: rgb(255,255,255); } .w64852499079s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499079s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499079s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499079s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( n h 为（ ）。
选项：
A:.w64852499090s .brush0 { fill: rgb(255,255,255); } .w64852499090s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499090s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499090s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499090s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499090s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64852499090s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) ( 2 1 n h n h -
B:.w64852499036s .brush0 { fill: rgb(255,255,255); } .w64852499036s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499036s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499036s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499036s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499036s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64852499036s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) ( 2 1 n h n h +
C:.w64852499062s .brush0 { fill: rgb(255,255,255); } .w64852499062s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499062s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499062s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499062s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499062s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64852499062s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) ( 2 1 n h n h ×
D:.w64852499021s .brush0 { fill: rgb(255,255,255); } .w64852499021s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499021s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499021s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499021s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499021s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64852499021s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) ( 2 1 n h n h *
答案: 【.w64852499021s .brush0 { fill: rgb(255,255,255); } .w64852499021s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499021s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499021s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499021s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499021s .font3 { font-size: 373px; font-family: Symbol, serif; } .w64852499021s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( ) ( 2 1 n h n h *】
4、单选题：
关于差分方程，不正确的是（ ）。
选项：
A:一般形式是： .w64852499057s .brush0 { fill: rgb(255,255,255); } .w64852499057s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499057s .font0 { font-size: 530px; font-family: Symbol, serif; } .w64852499057s .font1 { font-size: 242px; font-family: Symbol, serif; } .w64852499057s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499057s .font3 { font-style: italic; font-size: 262px; font-family: "Times New Roman", serif; } .w64852499057s .font4 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499057s .font5 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499057s .font6 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499057s .font7 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } å å = = - = - N i M m m i m n x b i n y a 1 0 ) ( ) (
B:常用来描述离散时间系统
C:常用来描述连续时间系统
D:通过差分方程可以求出系统的系统函数 .w64852499072s .brush0 { fill: rgb(255,255,255); } .w64852499072s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499072s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499072s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499072s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( z H
答案: 【常用来描述连续时间系统】
5、单选题：
长度为 .w64852499047s .brush0 { fill: rgb(255,255,255); } .w64852499047s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499047s .font0 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499047s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } M 的序列 .w64852499038s .brush0 { fill: rgb(255,255,255); } .w64852499038s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499038s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499038s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499038s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499038s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( 1 n x 与长度为 .w64852499024s .brush0 { fill: rgb(255,255,255); } .w64852499024s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499024s .font0 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499024s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } N 的序列 .w64852499094s .brush0 { fill: rgb(255,255,255); } .w64852499094s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499094s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499094s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499094s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499094s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( 2 n x 的卷积和 .w64852499076s .brush0 { fill: rgb(255,255,255); } .w64852499076s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499076s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499076s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499076s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499076s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( * ) ( 2 1 n x n x 的序列的长度为（ ）。
选项：
A:.w64852499033s .brush0 { fill: rgb(255,255,255); } .w64852499033s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499033s .font0 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499033s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } M
B:.w64852499017s .brush0 { fill: rgb(255,255,255); } .w64852499017s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499017s .font0 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499017s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } N
C:.w64852499069s .brush0 { fill: rgb(255,255,255); } .w64852499069s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499069s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499069s .font1 { font-size: 373px; font-family: Symbol, serif; } .w64852499069s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499069s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 - + N M
D:.w64852499086s .brush0 { fill: rgb(255,255,255); } .w64852499086s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499086s .font0 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499086s .font1 { font-size: 373px; font-family: Symbol, serif; } .w64852499086s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } N M +
答案: 【.w64852499069s .brush0 { fill: rgb(255,255,255); } .w64852499069s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499069s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499069s .font1 { font-size: 373px; font-family: Symbol, serif; } .w64852499069s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499069s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 - + N M】
6、判断题：
离散时间序列 .w64852499054s .brush0 { fill: rgb(255,255,255); } .w64852499054s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499054s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499054s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499054s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499054s .font2 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499054s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499054s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64852499054s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) ππ sincos 53 xnAnBn =+ 是周期信号，其周期 .w64852499045s .brush0 { fill: rgb(255,255,255); } .w64852499045s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499045s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499045s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499045s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499045s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 30 N = 。（ ）
选项：
A:对
B:错
答案: 【对】
7、判断题：
设线性时不变系统输入信号为 .w64852499035s .brush0 { fill: rgb(255,255,255); } .w64852499035s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499035s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499035s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499035s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) xn ，该系统的单位脉冲响应为 .w64852499019s .brush0 { fill: rgb(255,255,255); } .w64852499019s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499019s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499019s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499019s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) hn ，则系统的输出 .w64852499089s .brush0 { fill: rgb(255,255,255); } .w64852499089s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499089s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499089s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499089s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499089s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) ( ) ( ) ynxnhn =* 。 （ ）
选项：
A:对
B:错
答案: 【对】
8、判断题：
系统 .w64852499071s .brush0 { fill: rgb(255,255,255); } .w64852499071s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499071s .font0 { font-size: 441px; font-family: Symbol, serif; } .w64852499071s .font1 { font-size: 377px; font-family: "Times New Roman", serif; } .w64852499071s .font2 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64852499071s .font3 { font-size: 347px; font-family: Symbol, serif; } .w64852499071s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) ( ) 2 ynxn = 不是时不变系统。（ ）
选项：
A:错
B:对
答案: 【错】
9、判断题：
常系数差分方程表示的系统必为线性时不变系统。 （ ）
选项：
A:对
B:错
答案: 【错】
10、判断题：
对于离散时间LTI系统，若当n<0时，h(n)=0，则该系统必是因果系统。（ ）
选项：
A:错
B:对
答案: 【对】
第二章 单元测试
1、单选题：
以 .w64852499031s .brush0 { fill: rgb(255,255,255); } .w64852499031s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499031s .font0 { font-style: italic; font-size: 363px; font-family: "Times New Roman", serif; } .w64852499031s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } N 为周期的周期序列的离散傅立叶级数是（ ）。
选项：
A:离散的，以 .w64852499083s .brush0 { fill: rgb(255,255,255); } .w64852499083s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499083s .font0 { font-style: italic; font-size: 363px; font-family: "Times New Roman", serif; } .w64852499083s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } N 为周期的
B:连续的，以 .w64852499013s .brush0 { fill: rgb(255,255,255); } .w64852499013s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499013s .font0 { font-style: italic; font-size: 363px; font-family: "Times New Roman", serif; } .w64852499013s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } N 为周期的
C:连续的，非周期的
D:离散的，非周期的
答案: 【离散的，以 .w64852499083s .brush0 { fill: rgb(255,255,255); } .w64852499083s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499083s .font0 { font-style: italic; font-size: 363px; font-family: "Times New Roman", serif; } .w64852499083s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } N 为周期的】
2、单选题：
已知序列的 .w64852499066s .brush0 { fill: rgb(255,255,255); } .w64852499066s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499066s .font0 { font-style: italic; font-size: 363px; font-family: "Times New Roman", serif; } .w64852499066s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } z 变换收敛域为 .w64852499052s .brush0 { fill: rgb(255,255,255); } .w64852499052s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499052s .pen1 { stroke: rgb(0,0,0); stroke-width: 16; stroke-linejoin: round; } .w64852499052s .font0 { font-size: 363px; font-family: "Times New Roman", serif; } .w64852499052s .font1 { font-style: italic; font-size: 363px; font-family: "Times New Roman", serif; } .w64852499052s .font2 { font-size: 334px; font-family: Symbol, serif; } .w64852499052s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 12 z << ，则该序列为（ ）。
选项：
A:有限长序列
B:右边序列
C:左边序列
D:无限长序列
答案: 【无限长序列】
3、单选题：
实序列的傅立叶变换必是（ ）。
选项：
A:奇函数
B:共轭反对称函数
C:偶函数
D:共轭对称函数
答案: 【共轭对称函数】
4、单选题：
已知因果系统 .w64852499043s .brush0 { fill: rgb(255,255,255); } .w64852499043s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499043s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499043s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499043s .font1 { font-size: 260px; font-family: "Times New Roman", serif; } .w64852499043s .font2 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499043s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499043s .font4 { font-size: 241px; font-family: Symbol, serif; } .w64852499043s .font5 { font-size: 373px; font-family: Symbol, serif; } .w64852499043s .font6 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) 1 1 10.2 Hz z - = - ，则其单位脉冲响应及其收敛域应为（ ）。
选项：
A:.w64852499085s .brush0 { fill: rgb(255,255,255); } .w64852499085s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499085s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499085s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499085s .font2 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64852499085s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499085s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64852499085s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) 51 n un --- , .w64852499068s .brush0 { fill: rgb(255,255,255); } .w64852499068s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499068s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499068s .font0 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499068s .font1 { font-size: 373px; font-family: Symbol, serif; } .w64852499068s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } z <5
B:.w64852499081s .brush0 { fill: rgb(255,255,255); } .w64852499081s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499081s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499081s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499081s .font2 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64852499081s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499081s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64852499081s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) 0.21 n un --- , .w64852499064s .brush0 { fill: rgb(255,255,255); } .w64852499064s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499064s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499064s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499064s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499064s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499064s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 0.2 z " x="452" y="416"> >
C:.w64852499032s .brush0 { fill: rgb(255,255,255); } .w64852499032s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499032s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499032s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499032s .font2 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64852499032s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499032s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) 0.2 n un ， .w64852499015s .brush0 { fill: rgb(255,255,255); } .w64852499015s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499015s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499015s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499015s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499015s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499015s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 0.2 z " x="452" y="416"> >
D:.w64852499029s .brush0 { fill: rgb(255,255,255); } .w64852499029s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499029s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499029s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499029s .font2 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64852499029s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499029s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64852499029s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) 0.21 n un --- , .w64852499099s .brush0 { fill: rgb(255,255,255); } .w64852499099s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499099s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499099s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499099s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499099s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499099s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 0.2 z <
答案: 【.w64852499032s .brush0 { fill: rgb(255,255,255); } .w64852499032s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499032s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499032s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499032s .font2 { font-style: italic; font-size: 260px; font-family: "Times New Roman", serif; } .w64852499032s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499032s .font4 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) 0.2 n un ， .w64852499015s .brush0 { fill: rgb(255,255,255); } .w64852499015s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499015s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499015s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499015s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499015s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499015s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 0.2 z " x="452" y="416"> >】
5、单选题：
序列 .w64852499051s .brush0 { fill: rgb(255,255,255); } .w64852499051s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499051s .font0 { font-size: 441px; font-family: Symbol, serif; } .w64852499051s .font1 { font-size: 377px; font-family: "Times New Roman", serif; } .w64852499051s .font2 { font-style: italic; font-size: 231px; font-family: "Times New Roman", serif; } .w64852499051s .font3 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64852499051s .font4 { font-size: 215px; font-family: Symbol, serif; } .w64852499051s .font5 { font-size: 347px; font-family: Symbol, serif; } .w64852499051s .font6 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) ( ) 2 n xnun - = ，其z变换 .w64852499042s .brush0 { fill: rgb(255,255,255); } .w64852499042s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499042s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499042s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499042s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ) ( z X 及其收敛域为（ ）。
选项：
A:.w64852499082s .brush0 { fill: rgb(255,255,255); } .w64852499082s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499082s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499082s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64852499082s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499082s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499082s .font3 { font-size: 241px; font-family: Symbol, serif; } .w64852499082s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64852499082s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 11 1 12 z -- - ， .w64852499065s .brush0 { fill: rgb(255,255,255); } .w64852499065s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499065s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499065s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499065s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499065s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499065s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 z " x="452" y="416"> >
B:.w64852499026s .brush0 { fill: rgb(255,255,255); } .w64852499026s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499026s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499026s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64852499026s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499026s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499026s .font3 { font-size: 241px; font-family: Symbol, serif; } .w64852499026s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64852499026s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 1 12 z - - ， .w64852499096s .brush0 { fill: rgb(255,255,255); } .w64852499096s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499096s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499096s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499096s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499096s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499096s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 2 z " x="452" y="608"> >
C:.w64852499078s .brush0 { fill: rgb(255,255,255); } .w64852499078s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499078s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499078s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64852499078s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499078s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499078s .font3 { font-size: 241px; font-family: Symbol, serif; } .w64852499078s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64852499078s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 11 1 12 z -- - ， .w64852499061s .brush0 { fill: rgb(255,255,255); } .w64852499061s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499061s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499061s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499061s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499061s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499061s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 2 z " x="452" y="608"> >
D:.w64852499030s .brush0 { fill: rgb(255,255,255); } .w64852499030s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499030s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499030s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64852499030s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499030s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499030s .font3 { font-size: 241px; font-family: Symbol, serif; } .w64852499030s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64852499030s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 1 12 z - - ， .w64852499012s .brush0 { fill: rgb(255,255,255); } .w64852499012s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499012s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499012s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499012s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499012s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499012s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 2 z " x="452" y="416"> >
答案: 【.w64852499078s .brush0 { fill: rgb(255,255,255); } .w64852499078s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499078s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499078s .font0 { font-size: 260px; font-family: "Times New Roman", serif; } .w64852499078s .font1 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499078s .font2 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499078s .font3 { font-size: 241px; font-family: Symbol, serif; } .w64852499078s .font4 { font-size: 373px; font-family: Symbol, serif; } .w64852499078s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 11 1 12 z -- - ， .w64852499061s .brush0 { fill: rgb(255,255,255); } .w64852499061s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499061s .pen1 { stroke: rgb(0,0,0); stroke-width: 19; stroke-linejoin: round; } .w64852499061s .font0 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499061s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499061s .font2 { font-size: 373px; font-family: Symbol, serif; } .w64852499061s .font3 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } 1 2 z " x="452" y="608"> >】
6、判断题：
序列 .w64852499050s .brush0 { fill: rgb(255,255,255); } .w64852499050s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499050s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499050s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499050s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) xn 的傅立叶变换 .w64852499041s .brush0 { fill: rgb(255,255,255); } .w64852499041s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499041s .font0 { font-size: 558px; font-family: Symbol, serif; } .w64852499041s .font1 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499041s .font2 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499041s .font3 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499041s .font4 { font-style: italic; font-size: 242px; font-family: Symbol, serif; } .w64852499041s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) j e X w 是角频率的周期函数，周期为 .w64852499028s .brush0 { fill: rgb(255,255,255); } .w64852499028s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499028s .font0 { font-style: italic; font-size: 373px; font-family: Symbol, serif; } .w64852499028s .font1 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } p 。（ ）
选项：
A:错
B:对
答案: 【错】
7、判断题：
序列 .w64852499098s .brush0 { fill: rgb(255,255,255); } .w64852499098s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499098s .font0 { font-size: 470px; font-family: Symbol, serif; } .w64852499098s .font1 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499098s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) xn 的z变换 .w64852499080s .brush0 { fill: rgb(255,255,255); } .w64852499080s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499080s .font0 { font-size: 441px; font-family: Symbol, serif; } .w64852499080s .font1 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64852499080s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) Xz 的收敛域包含单位圆时，其傅里叶变换 .w64852499063s .brush0 { fill: rgb(255,255,255); } .w64852499063s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499063s .font0 { font-size: 526px; font-family: Symbol, serif; } .w64852499063s .font1 { font-size: 231px; font-family: "Times New Roman", serif; } .w64852499063s .font2 { font-size: 377px; font-family: "Times New Roman", serif; } .w64852499063s .font3 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64852499063s .font4 { font-style: italic; font-size: 215px; font-family: Symbol, serif; } .w64852499063s .font5 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) j e X w 与其z变换 .w64852499022s .brush0 { fill: rgb(255,255,255); } .w64852499022s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499022s .font0 { font-size: 441px; font-family: Symbol, serif; } .w64852499022s .font1 { font-style: italic; font-size: 377px; font-family: "Times New Roman", serif; } .w64852499022s .font2 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } ( ) Xz 的关系，用公式表示为 .w64852499092s .brush0 { fill: rgb(255,255,255); } .w64852499092s .pen0 { stroke: rgb(0,0,0); stroke-width: 1; stroke-linejoin: round; } .w64852499092s .pen1 { stroke: rgb(0,0,0); stroke-width: 16; stroke-linejoin: round; } .w64852499092s .font0 { font-style: italic; font-size: 190px; font-family: Symbol, serif; } .w64852499092s .font1 { font-style: italic; font-size: 242px; font-family: Symbol, serif; } .w64852499092s .font2 { font-size: 204px; font-family: "Times New Roman", serif; } .w64852499092s .font3 { font-size: 262px; font-family: "Times New Roman", serif; } .w64852499092s .font4 { font-size: 406px; font-family: "Times New Roman", serif; } .w64852499092s .font5 { font-size: 242px; font-family: Symbol, serif; } .w64852499092s .font6 { font-size: 373px; font-family: Symbol, serif; } .w64852499092s .font7 { font-style: italic; font-size: 262px; font-family: "Times New Roman", serif; } .w64852499092s .font8 { font-style: italic; font-size: 406px; font-family: "Times New Roman", serif; } .w64852499092s .font9 { font-weight: bold; font-size: 76px; font-family: System, sans-serif; } w w j e j ) ( ) e ( = = z z X X 。 （ ）
选项：
A:错
B:对
答案: 【对】
8、判断题：
序列的离散时间傅里叶变换是周期函数。 （ ）
选项：
A:错
B:对
答案: 【对】
9、判断题：
离散时间LTI因果稳定系统的系统函数的极点可能在单位圆外。 （ ）
选项：
A:错
B:对
答案: 【错】
10、判断题：
对于离散时间LTI系统的系统函数收敛域包含无穷远点则该系统必是因果系统。（ ）
选项：
A:对
B:错
答案: 【对】