Dual mode gen-lock system which automatically locks to color bur

Details Dual mode gen-lock system which automatically locks to color bur Dual mode gen-lock system which automatically locks to color bur

1988-01-11

1989-07-11

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358149, 358326, H04N 944

Patent

active

048476781

ABSTRACT:
A dual mode gen-lock system generates high frequency clocking pulses which are automatically synchronized to an external video signal. During the presence of color burst information in the external video signal, the clocking pulses are synchronized to the color burst. However in the absence of the color burst, the clocking pulses are synchronized to the horizontal sync pulses of the external video signal. This is accomplished by providing a phase locked loop which has an oscillator which free runs at the desired clock frequency, and which has a phase detector for comparing the phase difference between a selected portion of the PLL reference signal and a selected portion of either the color burst or horizontal sync pulses.

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