In component video signal,it's common to compose horizontal and vertical synchronous signals to single-channel composite synchronous signal for the purpose of simplifying the system.After that,the video signal is stacked on to form the composite video signal.However,in subsequent correlated treatment on the composite video signal,it is required that in previous composition link the polar of two synchronous signals must be the same,otherwise the synchronous signal and the video signal cannot be identified.In light of this issue,we propose an effective algorithm for synchronous signal polar identification and composition processing,and implement this through a simple circuit.Experiment shows that the designed circuit can completely solve the issue of identification and composition of synchronous signals with different polar,the circuit is simple and reliable in implementation.%在分量视频信号中,通常出于简化系统等目的需要将水平和垂直同步信号合成单路的复合同步信号[1,2],然后再和视频信号进行叠加形成复合视频信号.而后续的对复合视频的相关处理中,又要求前面的复合环节中的两个同步信号的极性必须相同,否则无法识别同步信号和视频信号.由此,提出一种有效的同步信号极性识别和复合处理算法,并进行了电路实现.实验证明,采用所设计的电路完全可以解决不同极性同步信号的识别与复合,电路实现简单、可靠.
展开▼
