APPARATUS FOR SYNCHRONIZED GENERATION OF A SIGNAL FROM A COMPOSITE COLOR VIDEO SIGNAL SUBJECTED TO SIGNAL PERTURBATIONS

摘要

1,272,447. Automatic phase lock systems. RCA CORPORATION. 26 Aug., 1969 [28 Aug., 1968], No. 42481/69. Heading H3A. In a system for synchronizing an oscillator 6 with an incoming signal 1 having two components, e.g. horizontal synchronizing pulses and colour bursts, one component, the colour burst signal, is fed to the oscillator to synchronize it and the other component, the horizontal synchronizing signal, is compared with the oscillator output in a frequency comparator 4 to provide a retroactive AFC signal for the oscillator. The oscillator output may be fed to the comparator via a divide-by-two stage 8 so that comparison is effected with alternate synchronizing pulses. The AFC signal controls a varactor diode in the oscillator, Fig. 2 (not shown).