Television 121027231853-phpapp02

20108003

Lu Yanan

TelevisionTelevision

Television (TV) is a telecommunication medium for transmitting and receiving moving images that can be monochrome (black-and-white) or colored, with or without accompanying sound. "Television" may also refer specifically to a television set, television programming, or television transmission.

Definition

closed-circuit television (CCTV) are in use, the most common usage of the medium is for broadcast television, which was modeled on the existing radio broadcasting systems developed in the 1920s, and uses high-powered radio-frequency transmitters to broadcast the television signal to individual TV receivers.

History

The first images transmitted electrically were sent by early mechanical fax machines, including the pantelegraph, developed in the late nineteenth century. The concept of electrically powered transmission of television images in motion was first sketched in 1878 as the telephonoscope, shortly after the invention of the telephone. At the time, it was imagined by early science fiction authors, that someday that light could be transmitted over copper wires, as sounds were.

Braun HF 1 television receiver, Germany, 1958→

Although television became more familiar in the United States with the general public at the 1939 World's Fair, the outbreak of World War II prevented it from being manufactured on a large scale until after the end of the war. True regular commercial television network programming did not begin in the U.S. until 1948. During that year, legendary conductor Arturo Toscanini made his first of ten TV appearances conducting the NBC Symphony Orchestra,[26] and Texaco Star Theater, starring comedian Milton Berle, became television's first gigantic hit show.[27] Since the 1950s, television has been the main medium for molding public opinion.[1]Amateur television (ham TV or ATV) was developed for non-commercial experimentation, pleasure and public service events by amateur radio operators. Ham TV stations were on the air in many cities before commercial TV stations came on the air.[28]In 2012, it was reported that television was growing into a larger component of major media companies' revenues than film.

Television Introduction By Country

China

China Central Television or Chinese Central Television, commonly abbreviated as CCTV, is the predominant state television broadcaster in mainland China. CCTV has a network of 22 channels broadcasting different programmes and is accessible to more than one billion viewers.[1] Most of its programmes are a mixture of documentary, comedy, entertainment, and drama, the majority of which consists of Chinese soap operas and entertainment

China CCTV

History

CCTV Peking (Beijing) Television (北京电视台 ) broadcast its first program on 2 September 1958. Due to increasing demands, it soon launched its second channel in the 1960s and third channel in the late of 1960s. Starting from 1 May 1973, Peking Television began broadcasting experimentally in colour on its second channel every Tuesday, Thursday, and Saturday using the PAL-D system, and fully converted to colour broadcasting by 1977. The network changed its name to CCTV on 1 May 1978. Today, CCTV has 22 national channels, all of them airing 24 hours a day.

Reference

http://en.wikipedia.org/wiki/Television

http://en.wikipedia.org/wiki/List_of_countries_by_number_of_television_broadcast_stations

http://en.wikipedia.org/wiki/China_Central_Television