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.
反相器响应低通滤波器的大于或者小于阈值电平的输出，输出处于高或低电平的信号。
An inverter responses the output of a level greater than or smaller than a threshold value of the low pass filter, and outputs a signal in a high level or a low level.
Sinking数字输出通过三极管来控制连接线上的电平为高电平(+ V)或是低电平(0 V)。
The sinking digital output controls the line by using a transistor to leave the line high (at + v) or to ground the line to 0 v.
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