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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.
1922: Charles Francis Jenkins' first public demonstration of television principles. A set of static photographic pictures is transmitted from Washington, D.C. to the Navy station NOF in Anacostia by telephone wire, and then wirelessly back to Washington; Philo Farnsworth first describes an image dissector tube, which uses cesium to produce images electronically.
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.
[106] [107] Electrical engineer Benjamin Adler played a prominent role in the development of television. [108] [109] The world's first 625-line television standard was designed in the Soviet Union in 1944 and became a national standard in 1946. [110] The first broadcast in 625-line standard occurred in Moscow in 1948. [111]
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).
The early days of television introduced hour-long anthology drama series, many of which received critical acclaim. [6] [7] Examples include Kraft Television Theatre (debuted May 7, 1947), The Chevrolet Tele-Theatre (debuted September 27, 1948), Television Playhouse (debuted December 4, 1947), The Philco Television Playhouse (debuted October 3, 1948), Westinghouse Studio One (debuted November 7 ...
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Television development halted with the onset of World War II, but a few pioneer stations remained on the air throughout the war, primarily WNBT, WCBW and WABD (the former W2XWV, which became commercially licensed in 1944, owned by the DuMont Television Network, now WNYW) in New York City, WRGB in Schenectady, New York (owned by General Electric ...