离散系统序列的基本运算，离散系统的冲激响应和阶跃响应，卷积的原理及应用， 离散LSI系统的时域响应，Z变换及其应用。-The basic operation sequence of discrete systems, discrete systems impulse response and step response, principles and application of convolution, time-domain response of discrete LSI system, Z transform and its application.