Design and Implementation of Video Overlap System Based on DSP/CPLD

A video overlap system is designed based on DSP and CPLD,which grabs and composes data by using video decoder,video encoder,DSP and CPLD to compose overlap system without assistant computer.It can overlap any character or graph.A distinguishing feature of the system is that it is not based on special video overlap chip that is common in this field,but uses DSP and CPLD to finish overlap functions.