信号与系统华南理工大学期末考试试卷B.doc

诚信应考,考试作弊将带来严重后果！ 华南理工大学期末考试 《 Signals and Systems 》试卷 B 注意事项：1. 考前请将密封线内各项信息填写清楚； 2. 所有答案请直接答在试卷上； 3．考试形式：闭 卷； 4. 本试卷共 3 大题，满分100分， 考试时间120分钟。 题 号 一 二 三 总分 得 分 评卷人 选择题（4分/每题，共20分） 1. Determine the output of the systems described by following differential equation: ， Determine zero-initial response and zero-state response ：（ ） （A）,， （B）, （C）, （D）, 2. Evaluate the following discrete-time convolution sums: = ( ) (A) (B) (C) (D) 3. The FS ofis , the FS of ( ) is . (A) (B) (C) (D) 4. The frequency response of a LTI system is , it is distortionless transmission or not? Determine the system output if the input is x(t)=sint+sin3t (-(t() . ( ) it is distortionless transmission; it is not distortionless transmission; it is distortionless transmission; it is not distortionless transmission; 5. The impulse response of a LTI system is ,the step response for the system is ( ) (A) (B), here (C) (D) , here 填空题（4分/每题，共20分） 1. A system has inputand output . If the system has properties, then the input and output pairs has the relationship: input is, so output is 。 2. Consider sampling ，determine the maximum of sampling interval T so that there will be no aliasing, (s). 3. Write or Sketch the spectrum of Rectangular pulse x[n]: There is the inverse relationship between the time and frequency extent of a signal, and the Time-Bandwidth Product of x[n] is 4. the impulse response of integrator is ，the impulse response of differentiator is , the impulse response of discrete-time time-shift operator is 。 5. write the advantages of modulation application to communication systems: (1) (2) (3)