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黑龙江科技学院2011届本科毕业论文（设计）论文题目：基于单片机的电话远程控制系统目录1绪论.............................................................................................................................42系统设计原理.............................................................................................................62.1硬件功能分析.................................................................................................62.2软件模块分析.................................................................................................83系统硬件电路设计....................................................................................................93.1振铃检测电路..................................................................................................93.1.1电路工作原理.......................................................................................93.1.2电路图设计..........................................................................................93.2摘挂机控制电路.............................................................................................93.2.1电路工作原理.......................................................................................93.2.2电路图设计........................................................................................103.2.3核心AT89C2051芯片介绍................................................................113.3双音频DTMF解码电路.................................................................................123.3.1电路工作原理....................................................................................123.3.2电路图设计........................................................................................133.3.3核心MT8870芯片介绍......................................................................133.3.4MT8870解码表...................................................................................143.4家用电器控制电路.......................................................................................153.4.1电路工作原理....................................................................................153.4.2电路图设计........................................................................................153.4.3核心74LS273芯片介绍....................................................................163.5信息反馈电路...............................................................................................173.5.1电路工作原理....................................................................................173.5.2音乐集成电路芯片介绍....................................................................183.5.3音乐集成电路使用中的注意事项.....................................................184系统软件设计...........................................................................................................194.1软件设计原理...............................................................................................194.2系统程序设计流程图...................................................................................195结束语.......................................................................................................................20参考文献......................................................................................................................21附录一电路总图........................................................................................................22附录二程序清单........................................................................................................23基于单片机的电话远程控制系统摘要:随着通讯产业的迅速发展,电话机已经走进了千家万户,但是利用电话机进行远程控制的技术却没有多少实质性的进展.如何将电话远程控制用于日常生活中正是本文所要研究的课题,众所周知,近几年通信和电子信息技术行业有了长足发展,本文设计了一种电话远程控制系统,该系统以AT89C2051单片机和MT8870双音多频解码集成电路为核心，借助公共电话网络，通过电话实现对远程设备智能化控制。文章介绍了系统的组成、工作原理及程序设计方法。对“振铃检测、模拟摘挂机控制、双音频解码，语音提示及家用电器控制”等电路作了详细的说明。用户在户外可通过任意一部双音多频电话（包括手机、电话分机）,根据语音提示,可以对各种电器（如电饭锅、微波炉等电器）进行远程控制。本装置适用于家庭、企事业单位、商店等场所,操作简单方便,系统性能可靠,是未来很有发展前景的科技产品.关键词:AT89C51单片机;双音多频DTMF解码电路;振铃检测;摘挂机控制Abstract：Asthedevelopmentofcommunication,telephoneiswidelyusedallovertheworld.Thisisourmotivethathowtomakethelong-distancecontrolsystembasedontelephonenetworkusedinourdailylife.Asweallknowthatthereisagreatdevelopmentincommunicationandelectricaltechnology.Inthisarticlealong-distancecontrolsystembasedontelephonenetworkisdesigned.Itcanalsobecalledintelligencecontrolsystem.Dependonthenetworkoftelephone,somefunctionsofthelong-distancecontrolsystembecometrue.Inthisarticlethecomposeofthecontrolsystemandtheprincipleaboutthelong-distancecontrolsystemareintroduced.Tomeettheneedsoflong-distanceandmanagementofautomationindustryequipmentsbasedonnetworkofcommunication.Thesystemaboutlong-distancecontrolmodelanditsarchitecturewereputforward,andoperationprinciplesofthesystemwerediscussedindetail.Keywords:Intelligence;Controller;Communication;Long-distance1绪论21世纪是信息时代，各种电信新技术推动了人类文明的进步。自从1876年，AlexanderGrahamBell（贝尔）发明电话以来，世界各国的电话网络发展非常迅速。进十年来，中国的固定电话业务呈现出举世瞩目的快速增长。1997年8月局用电话交换机总容量突破1亿门，网络规模跃居世界第二位，1999年7月固定电话用户总数突破1亿户。现代电话网络是由交换机和电话传输线共同组成，它的性能已经有了很大的进展，而且可靠性非常高。遥控技术是通过一定的手段对被控物体实施一定距离的控制，常用的方式有无线电遥控、有线遥控、红外线和超声波遥控等。无线电遥控既是利用无线电信号对被控物体实施远距离控制。无线电遥控不可避免的须占用一定的无线电频率资源，造成电磁污染；常规的有线遥控需进行专门的布线，增加了投入；而红外线、超声波遥控则受距离所限。现有的遥控方式中，还有载波通信控制手段和基于无线寻呼的遥控方