基于光纤的LED显示屏实时数字视频传输系统的设计

Design of Real-Time Digital Video Transmitting System Applied in LED Screen Based on Optical Fiber

给出了一种应用于LED显示屏远程实时数字视频传输系统的设计方案。将PC端DVI接口输出的视频信号,转换为适合远距离传输的以太网帧格式,在接收端进行帧解码和信号还原,并将接收模块与控制模块集成在一块电路板上,实现了输入端分辨率和刷新率的灵活设置。使用千兆以太网集线器并通过RJ45接口实现了接收控制板的板级级联,免去了数据接收转发的功能模块,减少了设计复杂度。为满足实际远距离传输的需求,打破了千兆以太网5类非屏蔽双绞线最长100m传输距离的限制,设计了一种以太网光纤转换模块,用单模光纤取代5类非屏蔽双绞线传输信号,最远传输距离达到10km。

A design of real-time digital video transmitting system applied in LED screen remote display was presented, which converts the video signal from the DVI interface of PC to the Ethernet frame format for long distance transmission. The digital signal would be decoded and recovered from the frames, and would be suitable for remote display. Receiving module and control module was integrated in a circuit board, which can set the resolution and refresh rate flexibly. The cascade of receive-control modules was realized by RJ45 interfaces of gigabit Ethernet Hub, which removed the module used for receiving and transmitting data and reduced the complexity of the design. On the basis of actual demand for long- distance transmission, breaking the restriction that the longest transmission of 1000BASE-T is 100 m, a design of optical fiber converter of Ethernet was presented. Using single-mode optical fiber instead of 1000BASE-T, the transmission distance is up to 10 km. This design proposal has implemented real-time digital video transmission with reasonable display effects, providing reference to the various real-time digital video transmission systems.