数字视频混合系统的设计

A design of digital video mixing system

介绍了利用Philips的一款视频芯片SAA7199B实现的数字视频混合系统。该系统可以将一路PAL制彩色复合视频信号编码进入另一路PAL制彩色复合视频信号中,以取代第二路视频中用户指定的颜色,从而实现了两路视频的混合。另外还介绍了如何利用单片机的I/O口模拟I2C总线以及如何利用单片机进行彩色空间变换的算法。

This paper describes the design of digital video mixing system based on Philips digital video encoder SAA7199B, which can substitute the assigned color in one color component video with another color component video. Especially, the paper also describes the method of using Micro Control Unit's (MCU) I/O ports to emulate PC bus and the algorithm of using MCU to convert the color spaces (YUV and RGB).