【摘要】 阐述了利用现有的通信网络—电话交换网络，采用双音多频（ＤＴＭＦ）方式传送信息的电话报警系统硬件结构和软件设计，并对报警装置（发端）、监控装置台（收端）功能及设计思想作了详细介绍．该系统采用单片机控制，功能强、报警速度快、通讯距离不受限制．特点是多功能、实用性强、电话号码和信息码可任意设置．迁移灵活、安装方便．更多还原

【Abstract】 The hardware and software of a multifunctional telephone alarm system which is based on the DTMFmethed have beed developed in this paper. The function and design consideration of alarm device and monitoring device are described in detail, respectively. As the existing telephone exchange network is used as channel, the communication distance of the syStem is unlimitde.Furthermore with the application of monolithic micomputer to the system the alarm speed is very high, and the telephone number ad charater code can be set freely. It has been comfirmed from practice that the system is very reliable and convenient to use.更多还原