To start with, the system dynamic equation is transformed into discrete-time state equation in observable canonical form.
首先，将系统动力学方程转化为离散的可观标准型状态方程；
With the aid of discrete Du's Transformation, we can solve the zero-state response of a discrete-time system usually described by a linear difference equation.
利用离散杜氏变换，给出线性离散系统零状态响应计算式，并可用以解线性差分方程；
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