重庆大学信号与系统本科试卷

1. A continuous-time signal is given as follow.

(1) Plot the waveform of the given signal. (3 points)
(2) Plot the waveform of the signal . (7 points)
2. The input-output relation of a continuous-time system is given by

Answer the following questions for the system:
(1) Is it a linear system? Why? (5 points)
(2) Is it a time-invariant system? Why? (5 points)
(3) Is it a causal system? Why? (5 points)
3. A linear time-invariant system is described by the following differential equation.