Closed-Circuit Television System

Closed-Circuit Television System


a television system in which transmitting cameras are connected to receivers by local communications cables.

Closed-circuit television systems are not used for broadcasting; they have applications in industry, transportation, medicine, and other areas. The mode of image scanning and deflection synchronization, the number of lines, the frame frequency, and other parameters of closed-circuit television systems are determined by the operational purpose of the system and need not comply with standards established for television broadcasting. Transmitting cameras for closed-circuit television systems are usually extremely simple; in most cases they contain only the transmitting tube (a superorthicon if illumination densities are low or a vidicon if illumination densities are high), the deflection system, and the preamplifier for the video signal. Operation of cameras is usually automatic or by remote control. Several types of equipment are produced for closed-circuit television systems. The simplest type is that for single-channel closed-circuit television. Such equipment consists of a transmitting camera and of a receiver; they can be separated by distances of 150–200 m. Current for the deflection systems of the transmitting tube and receiving tube is supplied by a common generator located in the receiver. In this case deflection synchronization and generation of a complete television signal are not required. The more complex, multichannel closed-circuit television systems usually consist of a set of single-channel systems, with a common terminal block added for camera control and switching. Receivers in such systems can be located at a distance of 1–2 km from the transmitting camera.


Polonik, V. S. Prikladnoe televidenie. Moscow-Leningrad, 1962.
Televidenie, 3rd ed. Edited by P. V. Shmakov. Moscow, 1970.


References in periodicals archive ?
A closed-circuit television system is installed all over the place for security and transparency purposes.
Contract awarded for Supply and Delivery of Spare Parts for Closed-Circuit Television System to Tuas South Incineration Plant.
It maintains various language, computer, clinical, and science laboratories and manages a closed-circuit television system with 13 studios.
Their performance was relayed over a closed-circuit television system to councillors watching in another room.
A more modern closed-circuit television system will be installed in a bid to combat the menace of anti-social behaviour in and around the library.
In many cases, though, the clients should be offered a tour of the secure site and even the opportunity to view the shredding of their own files via a closed-circuit television system or other Web-based video system, or even at a plant viewing room.
A closed-circuit television system in Berwick town centre may be extended following disturbances in the area of two nightclubs in Golden Square.
One was the development of closed-circuit television system cameras employing a solid state imaging device in lieu of the vidicon tube device.
Learn how to design the ideal closed-circuit television system.
Villagers are hoping to use the cash, which would come from the Voluntary and Community Organisation Scheme, to buy a pounds 10,000 closed-circuit television system for the centre and partitions to create three meeting rooms.
Other landmarks in the history of telemedicine include the closed-circuit television system at the Nebraska Psychiatric Institute that was used to provide a link with a state hospital 112 miles away in 1964 [6].
Formal surveillance: The police used a closed-circuit television system to monitor the park area.