CCTV System. How Stuff Works

CCTV or Closed Circuit Television is now common in Commercial establishments, Banks, Traffic control systems, etc to monitor the people’s activities and to prevent the attempt of theft.Its working is simple and similar to a Web camera. The system uses a Video Camera to transfer the video signals to the receiver end which may be a Television or a Computer Monitor. The transmission of signals is short range in the case of wired systems using RF cables and long range in Wireless transmission. Usually the transmission occurs in the range of 2.5-3 GHz. Some have night vision facility also using many Infrared LEDs. In Multichannel systems, many cameras are fixed at different places and a Multiviewer circuit displays the signals from all the cameras on the same monitor. The Digital Video Recorders (DVRs) provide recording facility continuously with extra features like motion detection. The IP based CCTV has mega pixel sensors help to record the data directly to network attached storage devices for completely stand alone operation. High Definition CCTV (HD CCTV) system is now available to identify and track the objects in their field of view.
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