Sync control for video overlay

Details Sync control for video overlay Sync control for video overlay

1990-09-14

1992-09-08

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, H04N 5262

Patent

active

051463369

ABSTRACT:
A video sync control circuit for controlling the stable synchronization of the display of locally generated signals on a TV screen in the presence or in the absence of a received signal which includes a sync signal. The circuit is comprised of apparatus for receiving an video input signal, apparatus for detecting the presence of an input sync signal which is part of the video input signal, and the absence of the sync signal during all or part of a sync interval of the video input signal, apparatus for locally generating a replacement video signal containing a video display which extends over a predetermined time interval, which is in sync with a local clock, apparatus for phase locking the local clock with the input sync signal, and apparatus for switching the input video signal to an output line during time other than during the time interval, and switching the replacement composite video signal to the output line during the time interval.

REFERENCES:
patent: 4639765 (1987-01-01), D'Hont
patent: 4992872 (1991-02-01), Hartmann et al.

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