无线可视对讲门禁系统中图像通信的设计与实现

设计一种以单片机AT89C51为核心,以SRWF-1,CAMERA OV 7620,IDT7205等为外围芯片的无线可视对讲电路,整个电路围绕图像的采集、传输、显示进行探讨。阐述了无线可视对讲电路中的软硬件处理技术。仿真结果表明,该可视对讲电路具有单色位图采集、按键确认访问房间号、无线传输图像信号、LCD显示单色位图、振铃呼叫等功能。与已有系统相比,该系统把低速单片机应用于数据量大的图像信号采集和图像短距离无线传输上,取得了较好的效果。

Design and Implementation of Image Communication of Door Control System with Wireless Visual Intercom Function

A theoretical design of a visual intercom circuit in which its main chip is single-chipAT89C51, and its peripheral chips are SRWF-1, CAMERA OV 7620 and IDT7205 is introduced. The circuits of image acquisition, transmission and dis- play are discussed. The hardware and software processing technologies in the wireless visual intercom circuit is elaborated. The simulation result shows that this kind of visual intercom circuit has the functions of monochrome bitmap acquisition, the room No. verification by buttons, the image signal wireless transimission, monochrome bitmap displayed by LCD, and bell calling. Compared with the existing systems, the design innovation is that the low speed single-chip microcomputer is used in a large quantity of image data acquisition and image signals of short-distance wireless transmission.