Video switcher

Details Video switcher Video switcher

1974-08-22

1977-07-19

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358181, 358185, H04H 522

Patent

active

040372502

ABSTRACT:
A closed circuit video surveillance system having a plurality of camera stations which may be connected by entirely random and independent selection to a plurality of monitors located at different viewing stations without degradation of video quality. Each camera feeds its video signal over its own transmission line to a central switching station at which all camera signals are collected. Each viewing station has a monitor connected by a transmission line to an electromechanical switching means located in the central switching station. A selector switch is also located at the viewing station and is connected to the electromechanical switching means for controlling its operation. The electromechanical switching means switches the viewing station monitors into connection with selected cameras. Signal degradation is prevented, even if all viewing stations selected the same camera, by the use of a high impedance video amplifier and by switching in dummy input resistances to maintain a constant impedance condition.

REFERENCES:
patent: 3194880 (1965-07-01), Weingart
patent: 3511926 (1970-05-01), Lami
patent: 3588336 (1971-06-01), Scher
patent: 3594496 (1971-07-01), Gabriel
patent: 3757039 (1973-09-01), Brewer
patent: 3816662 (1974-06-01), Shaver et al.
patent: 3922491 (1975-11-01), Bjork
patent: 3939306 (1976-02-01), Mosca

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