本刊1988年第8期发表了上海工业大学陆亨立的《电视信号奇偶场识别电路》一文。该文介绍的电路是在电视信号的奇数场到来后的第3行输出一奇场标志,偶场则无信号输出。本文介绍另一种电视信号奇偶场识别电路,这种电路在奇偶场开始的第1行即有标志输出,并在一场时间内始终保持这个标志。这在数字电视和计算机图像处理中有相当用处。 This issue No. 8, 1988 published Lu Hengli of Shanghai University of Technology “television signal odd and even field identification circuit” a text. The circuit introduced in this article is to output an odd field flag in the third row after the odd field of the television signal arrives, and there is no signal output in the even field. This article describes another television signal parity field identification circuit, this circuit in the first field of parity field has a flag output, and in a time and always maintain this flag. This is quite useful in digital television and computer image processing.