对应课程:点击查看
起止时间:2021-03-08到2021-06-21
更新状态:已完结
1st Week： Unit 1 Introduction Unit Test for Unit 1
1、 If you want to digitize the speech signal for subsequent processing, the speech signal must be passed through:
A:anti-aliasing analog filter
B:D / A conversion
C:digital filter
D:A / D conversion
答案: anti-aliasing analog filter;
A / D conversion
2、 The digital signal is a discrete-time signal with discrete-valued amplitudes.
A:正确
B:错误
答案: 正确
2nd Week： Unit 2 Discrete-Time Signals in the Time Domain Unit Test for Unit 2
1、 
A:5
B:10
C:
D:10/3
答案: 10
2、 Express 
as a linear combination of delayed unit sample sequences.
A:
B:
C:
D:
答案:
3、 
A:
B:
C:
D:
答案:
4、 The length of the sequence obtained by linear convolution of length-M and length-N signals is
A:M + N
B:M + N -1
C:M + N +1
D:M * N
答案: M + N -1
5、 
A:
B:
C:
D:
答案:
6、 Regarding the unit step sequence, the correct descriptions are
A:finite length sequence
B:causal sequence
C:infinite length sequence
D:right-sided sequence
答案: causal sequence;
infinite length sequence;
right-sided sequence
3rd Week： Unit 3 Discrete-Time Signals in the Frequency Domain Unit Test for Unit 3
1、 
A:
B:
C:
D:
答案:
2、 For a discrete time sequence x[n], its DTFT must satisfy
A:
B:
C:
D:
答案:
3、 
A:
B:
C:
D:
答案:
4、 Let 
denote the DTFT of the sequence 
then 
A:0
B:-3
C:-5
D:uncertain
答案: -3
5、 Let denote the DTFT of the sequence
then 
A:3
B:11
C:31
D:uncertain
答案: 31
6、 The DTFT of discrete time signal h[n] is 
then h[n] =
A:
B:
C:
D:
答案:
7、 
A:正确
B:错误
答案: 错误
8、 The sequence x[n] has the same magnitude spectrum as its delayed sequence x[n-5].
A:正确
B:错误
答案: 正确
4th Week： Unit 4 Sampling and Recovery of Analog Signal Unit Test for Unit 4
1、 When sampling a continuous-time signal with a maximum frequency 
, to satisfy the Nyquist criterion of the sampling theorem, the range of the sampling interval T is
A:
B:
C:
D:
答案:
2、 Sampling two continuous-time sinusoidal signals with frequencies of 
and 
at the sampling frequency 
, if the two sequences obtained after sampling are equal, they need to meet
A:
B:
C:
D:No requirements for 
and 
答案:
3、 Consider the continuous-time signal 
, is in units of seconds, and the discrete-time sequence 
is obtained after sampling, then the sampling frequency is
A:4000 Hz
B:1/8000 Hz
C:8000 Hz
D:2000 Hz
答案: 8000 Hz
4、 A continuous-time signal xa(t) is composed of a linear combination of sinusoidal signals of frequencies 300Hz, 500Hz, 1.2kHz, 2.15kHz and 3.5 kHz. The signal xa(t) is sampled at a 3 kHz rate, and the sampled sequence is then passed through an ideal lowpass filter with a cutoff frequency of 900 Hz, generating a continuous-time signal ya(t). What are the frequency components present in the reconstructed signal ya(t)?
A:300 Hz
B:850 Hz
C:1200 Hz
D:500 Hz
答案: 300 Hz;
850 Hz;
500 Hz
5、 The cut-off frequency of the reconstruction filter used to recover the analog signal is the sampling angular frequency.
A:正确
B:错误
答案: 错误
6、 Anti-aliasing filtering is only required before sampling an analog signal of unlimited bandwidth.
A:正确
B:错误
答案: 错误
5th Week： Unit 5 z-Transform Unit Test for Unit 5
1、 The region of convergence of z-transform of the sequence must not include:
A:zero
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