Video signal output selection circuit

Details Video signal output selection circuit Video signal output selection circuit

1988-04-05

1989-05-16

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, H04N 504, H04N 5268

Patent

active

048314463

ABSTRACT:
A video signal output circuit which permits switching an output video signal from one input video signal source to another without loss of synchronization of the video monitor. A first pulse signal is produced synchronized with the vertical synchronizing signal of the first video signal. A first detector circuit detects the phase difference between the first pulse signal and a second pulse signal synchronized with the vertical synchronizing signal of the second video signal, and the period of generation of the first pulse signal is controlled in response to the phase detected phase difference. A second phase detector detects when the phase difference between the first pulse signal and the second pulse signal is within a predetermined range easily tolerated by the monitor. Switching from the first to the second video source is permitted when this phase difference is within the predetermined range.

REFERENCES:
patent: 4070695 (1978-01-01), Scholz
patent: 4532547 (1985-07-01), Bennett

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