电话铃音检测设计新法

A New Detection Method of the Telephone Ring

文章介绍了一种新型的电话铃音检测方法,它使用锁相原理和可编程CPLD器件来实现。此设计具有能够检测回铃音、忙音以及智能判断对方摘机、回铃音超时响铃等功能;还具有通用性强的功能,即进行简单的程序修改就能适应各种铃音的检测。

A new detection method of the telephone ring is introduced, which uses the principle of locking phase and the programmable device of the CPLD. It can detect the returning telephone ring, busy ring, plunking signal by itself and the overtime of the returning telephone ring. And it has the power of general quality.