基于TMDS差分技术的VGA长线传输系统研究与设计

Research and design of VGA long-distance transmission system based on TMDS differential technique

为了改善VGA信号在长线传输过程中产生的衰减和失真等问题,保证VGA信号稳定可靠的传输,提出了基于TMDS差分技术的长线传输方法。通过研究TMDS信号的通信协议,分析VGA长线传输过程中的关键问题,设计了一套包含发送端和接收端的VGA长线传输系统。在发送端VGA模拟信号通过模数转换和TMDS编码转变成数字差分信号,在接收端通过TMDS均衡、解码和数模转换,转换为VGA模拟信号。实验结果表明,该系统有效改善了VGA信号的衰减和失真现象,可保证信号的高质量、长距离传输。

To improve the attenuation and distortion problems in VGA signal transmission in long-distance, to ensure stable and reliable transmission, long-distance transmission method is proposed based on TMDS differential technique. By studying the TMDS protocol and analyzing key issues in VGA long transmission, a set that contained the transmitter and the receiver of the VGA long-distance trans- mission system is designed. In the transmitter, converted analog signals into digital differential signal through the analog to digital con- version and TMDS encoder. In the receiver, converted to analog signals through TMDS equalizer, TMDS decoder and digital to analog conversion. The results show that the system improved the VGA signal attenuation and distortion, achieved high-quality, long-distance transmission.