摘要
给出基于CM8870双音多频解码器的小型程控交换机设计。简单介绍了双音多频信号组成与CM8870解码器芯片的结构与功能,对CM8870解码器的收号过程进行了详细说明。最终给出了利用SM8951单片机作为交换机控制器控制小型交换机进行通信的完整电路设计。该设计经实现后证实系统可靠、稳定,能够顺利完成交换机的电路交换功能。
A design method of small SPC exchange based on DTMF decoder CM8870 is presented. The composition of DTMF signals, the framework and function of CM8870 are introdueed. The receiving course of CM8870 is elaborated. The whole circuit of a small SPC exchang that employs SM8951 MCU as the controller of SPC exchange to achieve communication is offered. The practical result of the exchange shows that the system is reliable and stable and can accomplish the functions of the design.
出处
《现代电子技术》
2010年第13期54-56,共3页
Modern Electronics Technique
