智能电话计时器的设计原理  

Design Principle of the Smart Phone Time-recorder

作　　者：张婵爱[1] 

机构地区：[1]太原理工大学科技处,山西太原030024

出　　处：《机械管理开发》2006年第5期69-70,共2页Mechanical Management and Development

摘　　要：介绍了一种智能电话计时器的设计与实现。该计时器以单片机AT89S51为主控芯片,通过接收电话信号音识别电路CR6230,识别出的各种电话信号音和MT8870的解码信息,以达到对用户每个主叫电话信息记录的目的;并带有人机交互的显示屏和控制键盘,以便用户查询主叫信息。The research and realization of a kind of samrt phone time-recorder are introduced,whose top management chip,one-chip computer AT89S51,can distinguish the different signal sound of the telephone and the decode message of MT8870 through CR6230 distinguishing circuit for received phone signal and sound to achieve the purpose of writing down call message for human-computer interaction controlled by keyboard for users＂ information inquiry.

关 键 词：DTMF 单片机 12C协议 串行通信 

分 类 号：TN915.5[电子电信—通信与信息系统]