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Video-security-backup-system

Anti-theft device using code type transponder

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Inexpensive modulated backscatter reflector

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Video security backup system

Details

Inventors: Reese, Daniel J.;
Assignee: Philips Electronics North America Corporation (New York, NY)
Primary Examiner: Ramirez; Ellis B.
Assistant Examiner: Wachsman; Hal P.
Attorney, Agent or Firm:

A video security surveillance system comprises a backup video switching control unit connected in tandem with a primary video switching control unit. A backup controller monitors operation of the primary switching control unit and automatically effects transfer of control of the video security system to the backup switching control unit upon detection of a failure condition of the primary switching control unit. During normal operation, the backup switching control unit is continuously updated with the same configuration parameters as the primary switching control unit so that in the event of a failure condition requiring a transfer to the backup switching control unit, the transfer of control is effected wherein the backup switching control unit operates in accordance with the same configuration data as the primary switching control unit prior to the failure condition.

DETAILED DESCRIPTION In accordance with one aspect of the present invention, a video security system is provided having at least one video monitor connected to receive a video signal and for displaying a video image represented by the video signal; a plurality of cameras each disposed at a location remote from the video monitor for producing a video signal representing an image of the respective remote location; a first video switching unit connected for receiving the video signal from each of the plurality of cameras and for providing the video signal to the video monitor; and a first switching control unit for receiving configuration data and for providing switching control signals to the first switching unit in accordance with the switching control signals.
The video security system according to this invention also includes a second switching control unit for receiving the configuration data and for providing switching control signals to a second video switching unit.
The second video switching unit has a video output terminal and is operable to provide the video signal to the output terminal in accordance with the switching control signals received from the second switching control unit.
A configuration selector generates the configuration data and is connected for transmitting the configuration data to the first switching control unit.
A backup controller connected with the configuration selector monitors the configuration data transmitted to the first switching control unit and provides a duplicate of said configuration data to the second switching control unit.
The backup controller includes a detection means for detecting a failure condition of the first switching control unit and produces a transfer control signal in response thereto.
A transfer mechanism is connected to receive the transfer control signal and, in response thereto, disconnects the video monitor from the first video switching unit, connects the video monitor to the output terminal of the second video switching unit, and transfers control of the video security system to the backup switching control unit

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