摘要
主要介绍单片机控制的ＤＴＭＦ信号接收器在程控交换机键控电话系统中的应用，详细分析了ＭＴ８８７０的内部结构和使用典型线路，描述了８０Ｃ３１单片机对ＭＴ８８７０接收器的控制工作原理，并应用该原理给出了设计长途电话控制加密器的电路方法。
This paper mainly introduced the application of DTMF accepter controled by single chip microcomputer in key telephone system.A type structure and route of the MT8870 and the principle of the 80C31 microcomputer to the MT8870 were analysed in details.And a method to design the auto-encoder route in telephone toll call restriction was gived.
出处
《江西科学》
1995年第2期103-106,共4页
Jiangxi Science
