提出了动态递归数字滤波器的鲁棒稳定性检验定理，将动态递归数字滤波器划分为两类，单调系统簇与非单调系统簇。

The robust stability test theorems of dynamic recursive digital filters have been proposed in the paper. The digital filters can be classified into two classes, monotone and non-monotone.

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本文研究并设计了一种基于可控电抗器的单调谐滤波器，可用于对单次谐波如3次、5次或7次谐波的滤除。

This paper studies and designs a single tuned filter based on a controllable reactor, it could filter odd harmonics such as 3rd or 5th or 7th and so on.

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指出形态滤波器的输出信号在一定的范围内呈现局部单调性，并且这种单调性是可预测的。

Then we point out that morphological filtered signals are locally monotonic in certain regions and the monotonicity can be predicted.

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