SYSTEM FOR PRODUCING A CONTINUOUS SIGNAL IN SYNCHRONOUS PHASE WITH A REFERENCE SIGNAL

摘要

A system for producing a continuous signal in synchronous phase with the color-burst signal of a composite color television signal which is received through a transmission system subject to comparatively large time-base variations such as a VTR, said system including means for comparing in phase said burst signal with the output of an oscillator whose oscillation frequency is nearly equal to that of the burst signal, the phase of oscillation of said oscillator being adjusted according to the detected difference of the phase; characterized in that said system also includes means for detecting variation in the frequency of the synchronizing signal contained in the television signal, the frequency of said oscillator also being adjusted according to the amount of the detected variation, thereby to extend the frequency range in which said oscillator can be pulled into the synchronization; and a method for demodulating the coded color signals utilizing the above-described system.