多选题1分 设置 Select the correct description about a causal LTI system i the impulse response hln=o, whenn<o b the impulse response =0. whenn<no the impulse response hn #0, when n<0 d the impulse response hIn =0, when n>0 国ixn=xln, for ns 0 then y[n]=y2n], for nsn 提交 2/6/2021 Zhongguo liu Biomedical Engineering shandong Univ
7 2/6/2021 Zhongguo Liu_Biomedical Engineering_Shandong Univ. Select the correct description about a causal LTI system: the impulse response the impulse response the impulse response A B C 提交 multiple choice h n n = 0, 0. when 0 h n n n = 0, . when h n n 0, 0. when D the impulse response E h n n = 0, 0. when 1 2 0 if for x n x n n n [ ] [ ], , = 1 2 0 then for y n y n n n [ ] [ ], . = 多选题 1分
单选题1分 设置 For a system with the input and output satisfying a linear constant-coefficient difference equation N M Sayl k=>6xIn-m k=0 m=0 If the system is initially at rest, then the system: is lti but noncausal system B)is LtI and causal system may not be Lti D)is definitely not LTI system. 提交 8 2/6/2021 Zhongguo liu Biomedical Engineering shandong Univ
8 2/6/2021 Zhongguo Liu_Biomedical Engineering_Shandong Univ. For a system with the input and output satisfying a linear constant-coefficient difference equation, If the system is initially at rest, then the system: is LTI but noncausal system; is LTI and causal system; may not be LTI; is definitely not LTI system. A B C D 提交 = = − = − M m m N k ak y n k b x n m 0 0 单选题 1分
单选题1分 设置 For a system with the input and output satisfying a linear constant-coefficient difference equation N M k=>6xIn-m k=0 m=0 if the system is specified to be linear time-invariant and causal, the output for a given input is: A) not uniquely specified; B) uniquely specified. 提交 2/6/2021 Zhongguo liu Biomedical Engineering shandong Univ
9 2/6/2021 Zhongguo Liu_Biomedical Engineering_Shandong Univ. For a system with the input and output satisfying a linear constant-coefficient difference equation, if the system is specified to be linear, time-invariant, and causal, the output for a given input is: not uniquely specified; uniquely specified. A B 提交 = = − = − M m m N k ak y n k b x n m 0 0 单选题 1分
单选题1分 设置 For a system with the input and output satisfying a linear constant-coefficient difference equation, N M -]=∑bn-m k=0 m=0 if the system is specified to be linear time-invariant and causal, the auxiliary conditions (initial-rest condit0ns初始松弛杀) are needed, they are A ifn]=0, forn<0, then y[n]=0, fo orn< 0 b ifx[n=0, forn<no, theny[n]=0, forn<n 提交 2/6/2021 Zhongguo liu Biomedical Engineering shandong Univ
10 2/6/2021 Zhongguo Liu_Biomedical Engineering_Shandong Univ. For a system with the input and output satisfying a linear constant-coefficient difference equation, if the system is specified to be linear, time-invariant, and causal, the auxiliary conditions (initial-rest conditions,初始松弛条件) are needed, they are: : A B 提交 = = − = − M m m N k ak y n k b x n m 0 0 if x n for n n then y n for n n = = 0 0 , , , . 0 0 if x n for n then y n for n = = 0 0 0 0 , , , . 单选题 1分
2.0 Introduction Signal: something conveys information represented mathematically as functions of one or more independent variables classified as Continuous-time(analog) signals, discrete-time signals digital signals Signal-processing systems are classified along the same lines as signals Continuous-time(analog) systems discrete-time systems, digital systems 2/6/2021 Zhongguo Liu_Biomedical Engineering_shandong Univ
11 2/6/2021 Zhongguo Liu_Biomedical Engineering_Shandong Univ. 2.0 Introduction ◆Signal: something conveys information, represented mathematically as functions of one or more independent variables. Classified as: ◆Continuous-time (analog) signals, discrete-time signals, digital signals ◆Signal-processing systems are classified along the same lines as signals: Continuous-time (analog) systems, discrete-time systems, digital systems