Apparatus for inserting a digital sync word, phase-synchronized to the color subcarrier, in place of the horizontal sync signal

摘要

Apparatus is disclosed for processing an analog color video information signal for recording on a magnetic media which involves stripping the horizontal synchronization pulses from the horizontal blanking intervals of the analog video information signal, sampling the video information signal at a predetermined data rate that is a multiple of the chrominance subcarrier frequency and converting the samples into a number of digital data streams having said predetermined data rate and thereafter inserting a unique digital synchronization word into the horizontal blanking interval on at least alternate ones of successive video lines so that the synchronization word is synchronized relative to the chrominance subcarrier and the phase relationship between the synchronization words and the subcarrier thereby remains constant.