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一、概述《电视技术》1987年11期介绍了“一种四入一出的集成电路视频切换电路” (下称“集成电路视频切换”)。如能将集成电路视频切换改为由单片机控制的视频切换电路,可使线路大大简化、成本降低,本文介绍一种由单片机控制的视频切换电路(电原理见图1)。其切换过程大致为:当P_1口的开关状态发生变化时,经软件延迟消除抖动和识别判断无误后,在场消隐期间实行切换。
I. Overview “Television Technology” 1987-11 introduces “a four-in-one integrated circuit video switching circuit” (hereinafter referred to as “integrated circuit video switch”). If you can change the integrated circuit video switch to the video switch circuit controlled by the single chip microcomputer, the circuit can be greatly simplified and the cost is reduced. In this paper, a video switch circuit controlled by a single chip microcomputer is introduced. The switching process is roughly as follows: When the P_1 port switch state changes, the software delay to eliminate jitter and identification to determine the correct, the implementation of switching during the field blanking.