Synchronizing circuit with improved interlace arrangement

Details Synchronizing circuit with improved interlace arrangement Synchronizing circuit with improved interlace arrangement

1985-11-07

1987-11-24

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358153, H04N 504

Patent

active

047092670

ABSTRACT:
A synchronizing circuit for a video display apparatus provides inputs for a composite sync signal or separate horizontal and vertical sync signals. The composite sync signal and the separate horizontal sync signal are applied to a sync separator that provides horizontal and vertical sync pulses in response to a composite sync input or horizontal sync pulses in response to a separate horizontal sync input. The separate vertical sync input is caused to bypass the sync separator. The bypass circuitry provides that the separate vertical sync input will take precedence over the separated vertical sync pulses of a composite sync signal in the event both signals are present.

REFERENCES:
patent: 4460918 (1984-07-01), Flasza
patent: 4568979 (1986-02-01), Takagi
patent: 4583119 (1986-04-01), Roscoe

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