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Closed-circuit television (CCTV), also known as video surveillance, [1] [2] is the use of closed-circuit television cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point-to-point, point-to-multipoint (P2MP), or ...
Walter Bruch. Walter Bruch (2 March 1908 – 5 May 1990) was a German electrical engineer and pioneer of German television. He was the inventor of closed-circuit television. [1] He invented the PAL colour television system at Telefunken in the early 1960s. [2] In addition to his research activities Walter Bruch was an honorary lecturer at ...
A closed-circuit television camera is a type of surveillance camera that transmits video signals to a specific set of monitors or video recording devices, rather than broadcasting the video over public airwaves. The term "closed-circuit television" indicates that the video feed is only accessible to a limited number of people or devices with ...
Family watching TV, 1958. The concept of television is the work of many individuals in the late 19th and early 20th centuries. The first practical transmissions of moving images over a radio system used mechanical rotating perforated disks to scan a scene into a time-varying signal that could be reconstructed at a receiver back into an approximation of the original image.
The Washington County Closed-Circuit Educational Television Project was the first closed-circuit television network in aiding elementary school teaching by the use of television. [1] The project took place in Washington County, Maryland, and started in September 1956. [2]
This is a list of all closed-circuit television and pay-per-view events held by World Championship Wrestling (WCW) and its predecessor Jim Crockett Promotions (JCP). From 1983 to 1987, these events aired live on closed-circuit television under the National Wrestling Alliance (NWA) banner. Beginning in 1987, the events would air live on pay-per ...
Non-public field tests and closed circuit demonstrations are not included. This list should not be interpreted to mean the whole of a country had television service by the specified date. For example, the United States, Great Britain, Germany, and the former Soviet Union all had operational television stations and a limited number of viewers by ...
Qube (stylized QUBE) was an experimental two-way, multi-programmed cable television system that played a significant role in the history of American interactive television. It was launched in Columbus, Ohio, on 1 December 1977. [1] Highly publicized as a revolutionary advancement, [2] the Qube experiment introduced viewers to several concepts ...