1、毕业设计(论文) I 摘摘 要要 随着人们物质水平的不断的提高,电话已经几乎成为每个家庭必备的通讯工具。 本课题旨在讨论,如何通过为普通的电话设计添加一个简单的装置,使其具有防盗和 报警的双重功能。 该装置主要围绕存储拨号芯片 MC145412P 展开设计, 由延时电路, 自动控制电路, 红外感应电路,语音电路,以及电源电路等外围电路完成相应的功能以实现整体实际 目标。该装置可广泛应用于家庭或其他监控的场合,在有警情发生时及时通过电话线 向主人或警力报警。它具有外形小巧,使用方便,可靠等优点。 关键词:电话;报警;双音频;多谐振荡器 毕业设计(论文) II Abstract Along wit
2、h our peoples living condition becoming much better than before,almost every family has owned a telephone as a necessary communication tool.This subject aims at :how to design a simple device for a generally used telephone,which fives alarm when it meets occasional steal or dacoity. The main functio
3、n of this device is finished by the chip “MC145412P”,other are accomplished by timing delay circuit,autocontrol circuit,infrared sensor circuit voice processing circuit and so on.All these circuits can do their jobs to make the aim of the whole design become true.This device can be widely used in fa
4、mily and any other positions that need monitoring,which can give alarm to the host or police when something unusual happening.The advantage of this device is:smart,convenient,credible and so on. Keywords: telephone ;alarm ;DTMF ;multivibatator 毕业设计(论文) III 目 录 前 言 . 1 1 课题分析 . 2 1.1 任务书要求 . 2 1.2 方案论证 . 2 1.2.1 方案提出及准备 . 2 1.2.2 方案选择 . 3 2 系统设计 . 8 2.1 设计思路 8 2.2 工作原理阐述 9 3 芯片介绍 . 10 3.1 MC145412P 介绍 10 3.2 CD4017 介绍 12 3.3 555 集成电路介绍 . 13 3.4 CD4011 介绍 14 4 具体电路设计及分析 . 15 4.1 红外线感应电路的设计 15 4