在电信号测量领域，逻辑信号的测量十分重要。

Logic signal measuring is very important in the field of electric signal measurement.

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逻辑信号从高电平到低电平的转换被称为下降沿。

A transition in a logic signal from a logic high to a logic low is referred to as a falling edge.

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逻辑信号按照预先设计的触发条件在特定时间段内采集。

The signals is sampled in the typical time segment according to the specified triggering condition.

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Now this is a rain gauge, and it's sitting on a roof of a building, and when the water falls into this gauge, it sends a signal to the logic unit of the computer, which immediately notifies the memory bank of the computer to seek out its instructions for a rainy day.

这是一个雨量测量器，安装在一个楼房的,屋顶上，当水流入到这个测量器，它就给计算机的逻辑部件发送一个信号，计算机立即通知内存条,为下雨天找出相应的指令。

哈佛公开课 - 计算机科学课程节选