Based on pulse counting principle, the high precision time interval can be obtained by measuring the number of the high-frequency reference clock through it.

设计了一种高精度时间间隔测量模块，该模块由单片机控制，采用脉冲计数原理，通过测量时间间隔内高频参考时钟个数，得到被测时间间隔的精确值。

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Historical data from North China over the period 1480-1980 is analyzed in terms of interval and counting properties.

本文借助点过程的区间性质和计数性质对从1480年到1980年间中国北部的地震历史资料进行统计分析。

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This paper puts forward a counting method of mode of series of unequal interval based on the traditional counting formula of that of series of equal interval. And it has been testified by an example.

文章在传统等距数列众数的计算公式基础上给出了异距数列众数的一个计算方法，并结合一个实例加以验证。

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