题目内容

The application areas of DSP include the following but（）

A. earthquake recording & analysis
B. cognitive science
C. echo reduction
D. simulation and modeling

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showed experimentally the possibility of electromagnetic wave propagation in waveguide（）

A. Heinrich Hertz
B. George Southworth and W.L.Barron
C. Oliver Heaviside
D. Lord Rayleigh

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A continuous signal is also called because its waveform is often analogous to that of the physical variable（）

A. an analog signal
B. a discrete signal
C. a digital signal
D. a sampled signal

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Which of the following statements best describes the property of the system T if y1（t）=T[x1（t）], y2（t）= T[x2（t）] implies T[ax1（t-s）+bx2（t-s）]= ay1（t-s）+by2（t-s）（）

A. the system is linear
B. it is a linear time-invariant system
C. the system satisfies the principle of superposition
D. the system satisfies additivity and time-invariance

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The unit impulse signal is the unit step signal（）

A. the same as
B. the differential of
C. the integral of
D. the cumulative sum of

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The application areas of DSP include the following but（）

A. earthquake recording & analysis B. cognitive science C. echo reduction D. simulation and modeling

showed experimentally the possibility of electromagnetic wave propagation in waveguide（）

A continuous signal is also called because its waveform is often analogous to that of the physical variable（）

Which of the following statements best describes the property of the system T if y1（t）=T[x1（t）], y2（t）= T[x2（t）] implies T[ax1（t-s）+bx2（t-s）]= ay1（t-s）+by2（t-s）（）

The unit impulse signal is the unit step signal（）

A. earthquake recording & analysis
B. cognitive science
C. echo reduction
D. simulation and modeling