基于以太网通信的数字视频混合器研究与实现

Design and Realization of VDM Based on Ethernet Communication

根据以太网通信原理,设计了以太网通信的数字视频混合器(VDM)。该设备不仅能实现字符和图形在视频上的叠加显示,而且改进了以往VDM设备采用的串口通信方式,解决了以往VDM设备与计算机通信过程中信息传输速率慢、传输距离短、不能进行地址识别的问题。VDM设备通过以太网接口接入局域网,并通过以太网协议与计算机通信,提高了信息的传输速率和传输距离。每台VDM在局域网中都有独立的IP地址,实现了VDM设备的地址识别与联网控制。

A design method of VDM （Video Digital Mixer） based on Ethernet communication protocol was introduced, which not only superimposed characters and graphics on input video signal, but also communicated with the computer through Ethernet. The VDM equipment could provide higher communication speed and longer communication distance than the previous ones. Every set of the VDM equipment has unique IP address in the local area network, which can be recognized and parallel controlled by the computer.