COPY PROTECTION BY INSERTING A PHASE-SHIFTED COLOR BURST SIGNAL INTO THE BURST INTERVAL OF AN ANALOG COLOR VIDEO SIGNAL

摘要

An analog color video signal is prevented from beingsatisfactorily copied by inserting a phase-shifted color burstsignal of predetermined duration into a predetermined location ofthe usual burst interval of that analog color video signal. Thepredetermined location may precede the normal color burst signal,or it may follow the normal color burst signal or it may belocated in the middle of the burst interval.