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吉林大学电路与数字信号处理模拟题_603721

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吉林大学电路与数字信号处理模拟题_603721

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2A discrete-time LTI system is depicted in Figure A.3, where  
Digital Signal Processing 考试试卷  
h1[n] = {1, 2, 2, 1},  
n=0  
h2[n] = {1, 2, 2, 1},  
n=0  
h3[n] = {1, 1, 1, 1},  
课程编号  
考试形式  
考试日期  
题号  
得分  
阅卷  
总分  
n=0  
It is known that the input sequence is x[n] = u[n] - u[n-2].  
(a) Determine the overall impulse response h[n]. (5’)  
(b) Determine the system output sequence y[n]. (5’)  
y[n]  
x[n]  
h [n]  
h [n]  
1
2
1 The complete black diagram illustrating the process of digital processing of  
analog signal is depicted in Figure A.1:  
h[n]  
3
x3  
x2  
x5  
x6  
x7  
x1  
x4  
A/D  
Lowpass  
filter 1  
Digital  
D/A  
Lowpass  
filte 2  
S/H  
Figure A.3: A discrete-time LTI system  
Converte  
Processor  
Converter  
Figure A.1: Black diagram of digital processing an analog  
Assume that the sampling theorem is met, the plot of the output signal x2 of  
lowpass filter 2 is depicted in Figure A.2, and there is no distortion between x4 and  
x5, the input and the output sequences of the digital processor, then  
(a) Draw the plots of signals x3, x4, x5, x6 and x7. (2’5=10’)  
(b) What is the function(功能,作用) of lowpass filter 1? (5’)  
x2  
t
Figure A.2: The plot of x2  
x3  
3 Given a discrete-time sequence x[n] = u[n] - u[n-4]. Its DTFT can be  
   
(
expressed in the form X(ej ) = X( )ej  
), where X( ) and ( ) are real  
x4  
x5  
x6  
x7  
functions of . Determine X() and () respectively. (5’ 2=10’)  
1

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