Circuit and method for adding green synchronization pulse to red

Details Circuit and method for adding green synchronization pulse to red Circuit and method for adding green synchronization pulse to red

1986-09-26

1987-11-24

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 17, H04N 900, H04N 968, H04N 944

Patent

active

047092580

ABSTRACT:
A synchronization separation circuit is used to separate the synchronization signal portion of a green video signal. This synchronization signal is used to enable first and second comparators which compare the synchronization portion of the green video signal with the synchronization portions of the red and blue video signals respectively. A differential amplifier for each of the red and blue video signals, enabled by the green synchronization pulse and driven by the appropriate comparator, produces a synchronization pulse identical to that of the green video signal which is then added to the red or blue video signal.

REFERENCES:
patent: 3651248 (1972-03-01), Schneider
patent: 3715462 (1973-02-01), Krause
patent: 3852808 (1974-12-01), Sadashige
patent: 4030120 (1977-06-01), Pam Van Cang

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