1、大学本科毕业设计大学本科毕业设计 I 可视门禁系统的设计 摘 要 在现代智能建筑中装设安全防范装置和可视对讲门禁装置是发展的必然趋势。本文介 绍的可视对讲门禁户内机系统以单片机 AT89S52 作为系统控制核心部件，配以呼叫检测模 块、摘挂机检测模块、视频显示及控制模块、开锁和音频信号输入/输出控制模块、音频 信号输入放大模块、音频信号输出前置放大模块以及键盘组成。采用汇编语言编写单片机 程序，实现主机和副机之间双向通话，同时可通过主机的摄像头，在副机的显示器上显示 出访客头像等功能。利用键盘作为控制信号输入，实现房号（机号）修改、摘/挂机控制、 单双工控制、开门信号发送、监控大门口等控制功能
2、。 关键词 可视门禁；单片机；键盘扫描；双工对讲；音频信号 大学本科毕业设计大学本科毕业设计 II Abstract It is the inevitable development trend installing safe guard and visual diplex talk in modern intelligent building. The article introduces the visual diplex talk entrance guard, its core is AT89S52 single chip machine(SCM), including calling
3、 detecting module, picking-hanging telephone detecting module, video display and control module, unlock and audio signal input/output module, audio signal input amplification module, audio signal output pre-amplification module and keyboard. Using the assembly language programs to achieve the diplex
4、 talk between main machine and secondary machine, and displays the guests image in the screen of secondary machine picking up by the camera of main machine. By use of the keyboard, achieves the function of input control single that modifying the room number, picking-hanging telephone control, unilateral and diplex talk control, opening gate signal sending, monitoring gate and so on. Key words Visual entrance guard Single chip microcomputer (SCM) Keyboard scan Diplex talk Audio signal 大学本科毕业设计大学本科毕业设计 III 目 录 摘要 I Abstract II 第 1 章 绪论
