Apparatus for the color synchronization of reproduced video sign

Details Apparatus for the color synchronization of reproduced video sign Apparatus for the color synchronization of reproduced video sign

1985-03-21

1987-08-18

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358325, H04N 987

Patent

active

046881034

ABSTRACT:
An apparatus for the color synchronization of reproduced video signals, including a phase-locked loop (PLL) circuit. The PLL circuit detects a phase difference between a reproduced video signal (which may be a PAL video signal), and the output of a voltage-controlled oscillator within the PLL circuit, and has an internal loop filter which operates such that, when the apparatus is in an external synchronization mode, a high frequency component of the detected phase difference is used to control the time-base error of a variable delay line in the apparatus. Control means are included for placing the apparatus in external or internal synchronization mode, depending on the presence or absence of an external control signal. Further means are included for substantially precisely holding the phase inversion condition of a PAL video signal.

REFERENCES:
patent: 4403244 (1983-09-01), Fujishima
patent: 4460926 (1984-07-01), Nakamuta
patent: 4468709 (1984-08-01), Kenjyo

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