A: continue and periodic
B: continue and aperiodic
C: discrete and periodic
D: discrete and aperiodic
举一反三
- In the time domain， the procedure of restoring the original continuous-time signal from discrete sample values is called_______
- what is an analog signal? A: Analog signal is a continous values B: Analog signal is a discrete values C: Analog signal is sometimes continous,sometimes discrete
- Which of the following functions can a timer in a computer system be used to achieve? A: Generate interrupt signal regularly B: Measuring the frequency of external periodic signals C: Generate periodic pulse signals D: Generate periodic sine wave
- Comparing with an analog signal assuming a continuous range of values, a digital signal assumes discrete values, usually two permitted values.
- what is a digital signal? () A: discrete signals B: continuous signals C: both of a and b D: signals exist in the world
内容
- 0
Given the spectrum [img=21x22]18033774ad81d04.png[/img] of a continuous-time signal is shown below, then, the periodic signal signal [img=50x25]18033774b570388.png[/img][img=295x129]18033774bfda33c.png[/img] A: [img=142x20]18033774c806bc3.png[/img] B: [img=133x20]18033774d008a32.png[/img] C: [img=199x25]18033774d8e0526.png[/img] D: [img=138x21]18033774e1e1bd2.png[/img]
- 1
An analog signal x(t)=4sin(0.34πt) is sampled with the frequency 20Hz , then the expression of the discrete time signal x [n] is A: x[n]=4sin(0.034πn) B: x[n]=4sin(0.017πn) C: x[n]=4cos(0.034πn) D: x[n]=4cos(0.017πn)
- 2
From a rhetorical point of view, which kind of sentence does the following sentence belong to?If you’ve got the time, we’ve got the beer.? Loose|Periodic|Both periodic and loose|Balanced
- 3
Settling time and velocity are related to the water depth in discrete particle settling. A: True B: False
- 4
A continuous-time (C-T) periodic signal is shown below, then the components of the signal include ( )[img=634x330]180337809123d5d.bmp[/img] A: direct-current (DC) and cosine components of all harmonics B: DC and sine components of all harmonics C: DC and sine components of odd harmonics D: DC and cosine components of odd harmonics