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The elements of a simple broadcast television system are: . An image source. This is the electrical signal that represents a visual image, and may be derived from a professional video camera in the case of live television, a video tape recorder for playback of recorded images, or telecine with a flying spot scanner for the transfer of motion pictures to video).
1940: The American Federal Communications Commission, (), holds public hearings about television; 1941: First television advertisements aired. The first official, paid television advertisement was broadcast in the United States on July 1, 1941, over New York station WNBT (now WNBC) before a baseball game between the Brooklyn Dodgers and the Philadelphia Phillies.
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.
It is an innovative service that represents the most significant evolution in television broadcast technology since color television emerged in the 1950s. [143] Digital television's roots have been tied very closely to the availability of inexpensive, high performance computers. It was not until the 1990s that digital television became possible ...
Over the course of the 1960s and 1970s, concurrent with the development of color television, the evolution of television led to an event colloquially known as the rural purge; [86] genres such as the panel game show, western, variety show, barn dance and rural-oriented sitcom all met their demise in favor of newer, more modern series targeted ...
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 1939. Very few cities in each country had television service.
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The decade of the 1970s saw significant changes in television programming in both the United Kingdom and the United States.The trends included the decline of the "family sitcoms" and rural-oriented programs to more socially contemporary shows and "young, hip and urban" sitcoms in the United States and the permanent establishment of colour television in the United Kingdom.