Deflection circuit for non-standard signal source

Details Deflection circuit for non-standard signal source Deflection circuit for non-standard signal source

1987-04-30

1989-09-19

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358158, H04N 504

Patent

active

048686590

ABSTRACT:
A deflection circuit for a video apparatus operates in a countdown mode in which synchronization of the vertical deflection circuitry is accomplished in precise relationship to the horizontal deflection frequency. In order to permit countdown operation for nonstandard signal sources, such as video games, the countdown mode acceptance window is determined in a manner to encompass the coincidence of vertical sync pulses from signal sources having horizontal line per field ratios that may differ from the NTSC standard.

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patent: 4605965 (1986-08-01), McGinn

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