Closed Circuit Television (CCTV) is a system where the circuit in
which the video is transmitted is closed and all the elements (camera,
display monitors, recording devices) are directly connected. This is
unlike broadcast television where any receiver that is correctly tuned
can pick up and display or store the signal. In the past, these signals
would be transmitted to a monitor equipped with a videocassette
recorder, but these have been all but totally replaced by digital video
recorder (DVR) systems that can store far more video and back up data
automatically.
The most common use of CCTV is in security camera systems. They ve
been found for years in areas like large retail shops, banks, and
government institutions. Cameras and video recording equipment, camera
systems are becoming more and more commonplace in smaller businesses,
and even private homes.
Any camera that broadcasts a signal can be attached to a CCTV system,
whether it s wired or wireless, but they are most often associated with
high-end surveillance cameras. Pan/tilt/zoom (PTZ) cameras allow a user
to remotely control a camera. The type of lens used will depend on the
application and area the camera will be installed