轨道交通乘客信息系统中HDMI网络分配器的应用

Application of HDMI network distributor in rail passenger information system

在轨道交通乘客信息系统的实施过程中,针对乘客信息系统视频分配与传输环节的特殊环境,为了提升原有系统的抗干扰特性,将HDMI高清视频传输应用到乘客信息系统中。通过对HDMI高清数字信号进行压缩和降频,使HDMI信号的传输距离提升至百米级,同时在满足以太网网络带宽的提前下,保证了视频图像的清晰度,此外,同侧拉手传递的显示方案采用"无源通过"技术,从而保证了单点故障不扩散,该设计目前已在武汉轨道交通三号线投入使用,系统可靠、稳定。

In the process of the implementation of the rail transit passenger information system, the environment of passenger information system video distribution and transmission is special. In order to improve the anti - interference charaeleristics of original system, the High Definition Multimedia Interface transmission is applied to rail passenger information system. Through the HDMI digital signal compression and the frequency reduction, the HDMI signal transmission distance is extended up to hundred meters. At the same time, it can satisfy the Ethernet network bandwidth in advance and ensure the video image clarity. In addition, on the same side handle transfer display scheme uses the ＂passive＂ teehnology to ensure a single point of failure non - proliferation. The design has been put into use in the field of rail transit passenger information system. The system is reliable and stable.