另一个例子是设计从内部时钟获取数据的系统，用来取代请求用户输入。

Another example is designing a system that gets the date from the internal clock instead of asking for input from users.

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介绍了一类基于双向输入型鉴相器锁相环技术的时钟恢复系统。

The paper introduces a kind of clock recovery system based on phase-locked loop with bi-directly incident phase-comparator.

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位同步时钟信号的提取是通信系统中的关键部分，应用数字锁相环可以准确地从输入码流中提取出位同步信号。

Bit synchronous clock recover circuit is the key part of the communication system, it can exactly recover the synchronous signal from input data stream.

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