(一)　　离散时间系统函数：

1、　　自行设计某离散时间系统函数，至少是二阶的系统，画出零极点图，判断系统的稳定性。

2、　　求出单位样值响应，并画出图形。

3、　　求出系统的幅频响应和相频响应，并画出图形。

-(A) discrete-time system function: 1, to design a discrete-time system function, at least second-order system, draw the pole-zero diagram, determine the stability of the system. 2 to solve for the value of the response sample, and draw graphics. 3, find the system' s frequency response and phase response, and draw graphics.