HDMI车站终端显示系统设计

Design of Terminal Display System for HDMI in Subway Station

针对当前地铁车站终端显示系统实时高清显示的需求,提出了一套基于光纤的HDMI高清终端显示系统的设计方案。介绍了广播电视领域广泛使用的SDI和HDMI接口标准及其关键技术,阐述了系统总体架构设计和各模块具体功能。系统以FPGA为编码核心,以STC单片机为控制中心,实现SDI音视频信号的高标清转换、图像缩放,以及多路高清HDMI信号编码输出。试验运行结果证明系统具有很好的兼容性和稳定性。

According to the high-definition and real-time requirements of the terminal display system in subway station, a scheme of terminal display system for HDMI based on optical fiber is proposed. After introducing the signal standards and key techniques of SDI and HDMI interfaces which are widely used in the broadcast field,the overall structure design of system and the specific function of each module are described in the paper. In the sys- tem, FPGA is the encoding center and STC MCU controls the working of the system. The system achieves the transformation between high-definitian and standard-definition for SDI audio and video signals,image sealing, and the encoding of multiple roads of HDMI signal. The result of experiment indicates that the system has excellent compatibility and stability.