Television – Special applications – Manufacturing
Patent
1995-10-20
1998-09-08
Britton, Howard W.
Television
Special applications
Manufacturing
348143, 348211, 348571, 348614, H04N 714
Patent
active
058052020
ABSTRACT:
A video surveillance system includes a remotely controllable video camera which generates a video signal, a video switch, a cable for transmitting the video signal from the video camera to the video switch, a control circuit connected to the cable for generating control signals to be transmitted to the video camera via the cable, and a control signal receiver associated with the camera and connected to the cable for receiving the control signals transmitted via the cable. The control signal receiver includes a detection circuit for automatically detecting the length of the cable and generating an adjustment signal indicative of the detected length of the cable. The control signal receiver also includes an adjustable circuit element which is adjusted on the basis of the adjustment signal so as to compensate for the detected length of the cable. The automatic cable compensation in the control signal receiver provides reliable detection of the camera control signals. Automatic cable-length compensation of the video signal is also provided on the basis of the adjustment signal.
REFERENCES:
patent: 3568100 (1971-03-01), Tarbox
patent: 4054910 (1977-10-01), Chou
patent: 4222066 (1980-09-01), Zelenz
patent: 4996497 (1991-02-01), Waehner
patent: 5058198 (1991-10-01), Rocci
patent: 5434615 (1995-07-01), Matumoto
McDonough John P.
Mullins Christopher M.
Ray Thomas J.
Britton Howard W.
Sensormatic Electronics Corporation
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