知念甜品-台式甜品分享-课件（ppt·精·选）.ppt

南京理工大学课程考试试卷(学生考试用)
课程教学
大纲编号:   04027704   
课程名称:   Digital Signal Processing      学    分:            试卷编号:   001   
考试方式:         闭卷笔试                 考试时间:   120分钟      满分分值:   100分   
组卷年月:        2005年1月                 组卷教师:                审定教师:          
学生班级:                                   学生学号:                 学生姓名:      
Notice!
    1. All the answers should be written in the answer sheet!
    2. The following may be used for your answers:
    (1) Properties mon window functions:
 
Rectangular
Bartlett
Hanning
Hamming
Blackman
Width of mainlobe
4π/(M+1)
8π/M
8π/M
8π/M
12π/M
Peak approximation error (dB)
-21
-25
-44
-53
-74
    (2) Kaiser window:
1. Basic concepts: (18% )
    (1) Find the impulse response h[n] and the frequency response H(e jw)of the overall system shown in Fig 1.
Figure 1
    (2) The system is shown in , in which
    H(z) = (1- e j z-1)( 1- e- j 0. 3p z-1)(1- e j z-1)( 1- e- j z-1)
Figure 2
    Find a stable and causal Hc(z) =        so that the magnitude of the overall system |G(e jw)| =1.
    (3) The phase spectrum of sequence x[n] = d[n] + 2d[n -1] +d[n -2] is j(w) =         .
    (4) Suppose x[n] X[k] (0≤ n ≤N -1, 0≤ k ≤ N -1), then         WN 2kX[k].
    (5) A finite-length sequence x[n].is shown in . Sketch the sequences x1[n] and x2[n] specified as:
    x1[n]