自行设计产生两个离散序列信号，对其进行相加、乘及卷积运算。

利用filter命令求下面LTI系统的冲激响应，画出系统的零极点图，判断系统的稳定性、因果性。

绘出系统的频响曲线

-To design of two discrete sequence of signals , their sum , multiplication and convolution .

Seeking the following LTI system impulse response filter command , draw system pole-zero diagram to determine the stability of the system , causality .

Mapping the frequency response curve