方波信号：就是指电路系统中信号的质量，如果在要求的时间内，信号能不失真地从源端传送到接收端，我们就称该信号是方波信号。
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实现了高频方波信号的探测与数据的采集。
The detection and data collection of high frequency rectangle signal are realized.
方波信号是数字电路中非常重要的信号源，其产生方法有很多途径。
The squarewave signal is an extremely important source in the digital circuit, which could be produced in many ways.
脉宽调制器是一种能够产生周期固定而占空比(脉宽)可调的方波信号的电路。
Pulse width Modulation device is a circuit which can produce square wave signal with fixed period and adjustable pulse duration ratio (pulse width).
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