Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-03-05
1985-11-26
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358103, 358107, 358108, 358138, 358125, 358126, H04N 718
Patent
active
045557268
ABSTRACT:
Video signal monitoring apparatus searches a video signal for the existence f an imposed indicator signal having predetermined characteristics. The indicator signal is a series of pulses exceeding a predetermined brightness level and having a duration falling within a predetermined range of durations imposed one pulse per video line in a predetermined number of consecutive video lines in a video frame. A stripper circuit extracts signals indicative of the start of each video line and each video frame as well as pulses in each video line having a brightness level exceeding the predetermined brightness level which indicator pulses must exceed from the video signal as the video signal is received. The duration of each pulse extracted from a video line is determined and a counter is incremented for each line in which a pulse is found to exist having a duration falling within the range of durations established for indicator pulses. If the counter is incremented a predetermined number of times equal to the number of consecutive lines in which indicator pulses are imposed to constitute an indicator signal, without being cleared, an indicator found signal is produced for further use in alerting a system user to the existence of a valid indicator signal in the video signal.
REFERENCES:
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patent: 4443855 (1984-04-01), Bishop
Beers Robert F.
Beres William J.
Britton Howard W.
Skeer W. Thom
The United States of America as represented by the Secretary of
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