If, as in sampling or digital systems, some elemental equations are defined or used only at discrete points in time, a discrete-time system is the result.

而假如，在采样问题或数字系统中常见这种情况，有些基础方程仅定义于，或仅能应用于离散的时间点上，这就导致了离散时间系统。

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Since the decimation of discrete time signals is similar to the sampling of continuous signals, it is also studied in the thesis.

鉴于对离散信号的抽取和对连续信号的采样非常相似，本文还把研究范围拓展到了对离散信号的抽取问题。

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It USES the automatic control, the designation drying time, discrete sampling for automatical revolve or reverse revolve drying, and automatic stop at the appointed time.

它采用自动控制、选定烘干时间，就自动顺、倒运转烘干、到时自动停止并发出信号。

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