摘 要 本文介绍了一种以单片机 AT89C51 为主控制器和双音多频解码电路芯片 FM9270 为核心，通过电话线路实现对家用电器的远程、多路智能控制系统。该系统实用、功能灵活多样，可以对被遥控对象的状态进行查询以及控制，可以广泛地应用于家用电器或者其他场所的各种控制设备。系统主要由主控制器、振铃检测与模拟摘机电路、DTMF 解码电路、语音提示电路、集中控制器等构成。 随着生活水平的不断提高，人们希望有一种自动化、智能化程度高的控制系统对所有的家用电器能实施远程控制。本文介绍了一种基于 PSTN(Public Switched Telephone Network，公众电话网)实现对家用电器的远程控制，通过电话可以随时随地控制多种家用电器的开关和各种设定，诸如将空调提前升降温、电热水器提前预热等，应用前景相当广泛。 基于 PSTN 实现对家用电器的远程控制与常规的遥控方式，如无线电遥控、有线遥控、红外线和超声波遥控等相比，显示出一定的优越性，不需进行专门的布线，不占用无线电频率资源，避免了电磁污染。同时，由于电话线路各地联网，可以充分利用现有的电话网，因此遥控距离可跨省市，甚至跨越国家。关键词：AT89C51；ISD1420 ；FM9270；PSTN；远程控制....... AbstractThe text introduce a sort of control system that use AT89C51 single chip act as main controller and use both sound-many frequency decode circuit CMOS chip FM9270 act as core, through telephone line carry out family equipment’s long-distance many -way intelligent control. This system is so practical and the function is so agility and multiplicity, that can demand and control the state of the controlled object, can widely appliance in family equipment or other spatial all kinds of control equipment. The system mostly make up of main controller, check shake bell and simulate circuit, DTMF decode circuit, sound clew circuit, concentrate controller.Along with the improvement of the standard of living, people want to have a high automatic and intelligent control system that can control all the family equipment through long-distance. The text introduce a sort of control system that based on PSTN and can control all the family equipment through long-distance, through telephone can control the switch and set up of all the family equipment at any moment and everywhere, such as rise or drop the temperature of the air-condition ahead of schedule, warm-up the electronic water heater ahead of schedule, and so on. It’s appliance foreground of the system quite abroad.Based on PSTN carry out long-distance control family equipment show definitely advantage compare with wireless telephone control have-wire telephone control, infrared ray and ultrasonic telephone control and so on. It don’t need put up special line, don’t engross wireless frequency resource and avoid electromagnetism pollution. At the same time, thanks to the line in everywhere joined the net, it can make the best of the existing telephone network, so that the distance of wireless control can span province and city and can span country indeed.Key words: AT89C51；ISD1420 ；FM9270；PSTN；Long-distance control目 录引言……………………………………………………………………………11PSTN 介绍 …………………………………………………………………21.1 公...
