As the name implies, Closed Circuit Television (CCTV) is a system in which the circuit is closed and all the elements are directly connected. This is unlike broadcast television where any receiver that is correctly tuned can pick up the signal from the airwaves. Directly connected in this context includes systems linked by microwave, infrared beams, etc.

The Applications for CCTV

Probably the most widely known use of CCTV is in security systems and such applications as retail shops, banks, government establishments, home,etc. The true scope for applications is almost unlimited. Some examples are listed below:

  • Monitoring traffic at a car park.
  • A temporary system to carry out a traffic survey in a town centre.
  • Supermarkets for staff and public monitoring.
  • The well-publicised use at football stadiums.
  • Hidden in buses to control vandalism.
  • Production control in a factory.
  • Domestic properties to aid crime prevention.

The list is almost endless and is only limited by the imagination.

Simple CCTV Systems

The simplest CCTV system consists of a camera connected directly to a monitor by a coaxial cable with the power for the camera being provided from a local power supply, with no recording facility.

Complex CCTV Systems

Complex CCTV systems are those whereby a large number of cameras can be connected to a DVR, using all types of cameras, fixed and movable dome cameras wired back to a central location. External sensors can be linked to the system for alarm triggering and reporting, for particular parts of the site that require instant notification when the area being is violated.

Large commercial sites can be set up in this way but be centrally controlled in another part of the world, to enable companies to view their sites without actually being there, saving on manpower costs.

You may also be interested in our article discussing the components of a CCTV system Essex.