一种非标视频信号显示技术的研究和实现

Research and implement of techniques in a kind of unstandared television signals' display

国内监视器或类似显示设备不能显示没有标准行、场同步特征的电视信号。本文以某进口设备输出的非标视频信号为例,介绍了如何获取其完整的行、场同步信号,并外接入计算机视频接口卡,实现了该非标准电视信号在计算机显示器上的正常显示。其中采用LM1881完成行场分离过程,行同步信号处理单元基于CPLD进行设计和实现。实际应用表明该方案获得理想显示效果。由于从视频显示基本原理着手考虑,该技术具有较强的通用性。

The television signal without standered sync characteristic is hard to display on the monitor or similar equipment made in our country. The scheme on how to achieve the display of the unstandared television signal, which is the output of some imported equipment, is introduced , which is carried out by obtaining the full synchronized signals and then taking them as the external synchronizer of VGA-I）isplay-Card. The separation of the synchronized signal is achieved by LM1881 and the process of the vertical sync signal is designed and implemented on CPLD. The application of this scheme get a ideal result. And because this method is based on the fundamental of the video display, it has an universal usage.