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文章介绍公用电话网络系统的几种基本电信信号，然后结合实际中出现的几种不同情况的信号组合，介绍一种行之有效的滑动窗口识别复杂信号的方法。
This paper introduces several kinds of basic telecommunication signals of public telephone network system, and then introduces some effective combination of sliding windows to identify complex signals based on several signal combinations that appear in practice.