This paper presents the time domain analysis of three orders discrete system by power series, which can study not only the time invariant system, but also the time variant system.
利用幂级数的方法，对三阶线性离散系统进行时域分析，其方法不仅可以研究线性非时变离散系统，而且还可以研究线性时变离散系统。
The E-transform is a new series transform. It is an important tool for studying linear time-variant discrete systems.
变换是一种新的级数变换，为研究线性时变离散系统的重要工具。
The E-transform is a new series transform. It is an important tool for studying linear time-variant discrete systems.
变换是一种新的级数变换，为研究线性时变离散系统的重要工具。
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