王全胜家庭智能紧急呼救系统的设计 副本.doc

家庭智能紧急呼救系统的设计 摘 要 本文主要介绍了一种以单片机STC89C52RC和DTMF编码集成电路MT8888CE为核心，基于单片机控制的电话自动拨号呼救系统。平时系统处于等待状态，在经按键触发后，调用存储在单片机里的电话号码，并由单片机控制MT8888CE拨号，实现自动呼救功能。单片语音录放集成电路ISD1420提供系统语音呼救输出。本系统可以并联在任何一部普通电话上，可满足特殊群体在遇到非常情况下的紧急求助。本系统在实验调试中实现了设计的基本要求。文中详细介绍了系统软硬件的设计和调试过程。 关键词：双音多频，DTMF编码，电话呼救，MT8888，ISD1420 The Design of Household Intelligent Emergent Call System Abstract This paper mainly recommends a system about MT8888CE, which is for DTMF signal coding and is based on STC89SC2RC. Base on the brief of CPU’s controlling the telephone to automated ring system. And the whole circuit is in the status of awaiting opportunity. Once the key-press is touched off, the CPU will immediately go to the software to make the CMOS chip of MT8888CE for DTMF signal coding ring the correspond number which has already been input in the CPU. And then the ISD1420 output the voice to notice the helping department. The system can be parallelly connected with ordinary telephone, and could meet the needs of particular people in emergency. Have realized the request designed basically through the experiment. Have introduced the design of the software and hardware and debugging course systematically in detail in the article. Key Words: DTMF, DTMF code ,Telephone calling, MT8888, ISD1420  目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc169962463 前 言 PAGEREF _Toc169962463 \h 1 HYPERLINK \l _Toc169962464 1 绪 论 PAGEREF _Toc169962464 \h 2 HYPERLINK \l _Toc169962465 1.1 系统设计背景及意义 PAGEREF _Toc169962465 \h 2 HYPERLINK \l _Toc169962466 1.2 系统总体设计要求 PAGEREF _Toc169962466 \h 2 HYPERLINK \l _Toc169962467 1.3 系统主要设计内容 PAGEREF _Toc169962467 \h 2 HYPERLINK \l _Toc169962468 2 系统总体设计及可行性分析 PAGEREF _Toc169962468 \h 2 HYPERLINK \l _Toc169962469 2.1 系统总体设计 PAGEREF _Toc169962469 \h 2 HYPERLINK \l _Toc169962470 2.2 系统总体设计分析 PAGEREF _Toc169962470 \h 3 HYPERLINK \l _Toc169962471 2.3 硬件单元电路 PAGEREF _Toc169962471 \h 3 HYPERLINK \l _Toc169962472 2.3.1 自动摘挂机电路 PAGEREF _Toc169962472 \h 3 HYPERLINK \l _