本文讨论带时滞观测线性离散系统的滤波问题，提出利用联合分布函数，得到滤波递推格式。

In this paper, the recursive filtering problem for linear discrete systems with delay observations is concerned. By using joint distribution function, we obtain the recursive form of the filter.

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基于离散时频分布的信号识别方法，将时频核设计问题转化为以信号自模糊函数为原始特征的特征选择问题，以实现特征降维和信号识别。

Actually the kernel design in the recognition method based on discrete time - frequency representation is a problem of feature selection from the ambiguity functions to reduce feature dimension.

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介绍了用离散型随机变量的二项分布函数从试题库随机选题的数学模型。

This paper introduces the mathematical model for dynamically choosing questions from the question database by using binary distributed function with random variables.

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