Vertical sync signal generator

Television – Synchronization – Sync generation

Reexamination Certificate

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Reexamination Certificate

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07834933

ABSTRACT:
When a vertical sync pulse detection circuit mistakenly detects a vertical sync pulse in an inputted video signal, a sync stability detection circuit detects whether a detection signal of the vertical sync pulse detection circuit and a timing signal generated from a count value of a first frame cycle counter are in accordance, and the accordance confirmation detection result becomes one of discordance. When this occurs, the count value of the first frame cycle counter is not loaded to a second frame cycle counter so, due to the operation of the second frame cycle counter, a timing generating decoder circuit and a vertical sync signal generating circuit, a vertical sync signal at the previously detected normal phase can be generated.

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patent: 10117296 (1998-05-01), None

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