Given recent events related to the digital television transition, students will present important information about the history of television since its inception in the study of phototelegraph transmissions until the current "digital age." We hope that facilitates multi-format single study of this topic and serve as reference for future school assignments related to the topic. Remember to check the references to expand any further information about this topic.
HISTORY OF TELEVISION
I. TV predecessor
A.
phototelegraphy
1) is based on research by Edmond Becquerel (1820 - 1891), Alexander Bain (1810-1877), Frederick Collier Bakewell (1800-1869), Caselli (1815-1891), Jons Jacob Berzeius (1779-1848) and Sheldorf Bidwell (1848-1909), studies on electrical phenomena and wave propagation.
2) Using the wave telegraph (telegraph) to transmit pictures.
(a) The telegraph was invented in 1883 and used the Morse code to transmit messages.
(i) In 1887 Heinrich Hertz (1857-1894) proves the theory of James Clerk Maxwell (1831-1879) on electromagnetic waves, which they called "wireless telegraphy."
B. Nipkow disk
1) created in 1884 by German engineer Paul Nipkow (1860 - 1940)
2) known as disk light scanning
3) flat disk with spiral drill was rotated for viewing images on the other side.
4) The Scotsman John Logie Baird, for some father of television, perfect Nipkow tube.
C. Braun tube
1) created in 1897 by physicist Karl Ferdinand Braun (1850-1918)
2) was the first cathode ray tube
3) cylindrical structure with an incandescent cathode electron emission, centered on a lightning bolt and directed through a baffle system, is visible as a bright spot on a fluorescent screen.
D.
iconoscope
1) created en 1923 por el físico estadounidense de origen ruso, Vladimir Kosma Zworykin (1889-1982)
2) un tubo electrónico de cámara basado en el tubo de Braun.
3) mosaico electrónico compuesto por miles de pequeñas células fotoeléctricas independientes colocadas dentro de un tubo de vacio.
II. Creación del televisor
A. Imagen en movimiento
1) desarrollada por los franceses Rionoux y Fournier en 1906.
2) matriz de células fotosensibles que conectaban, al principio una a una, con otra matriz de lamparillas. Cada celula del emisor tenía una lamparillas en el receptor.
B. Televisión mecánica
1) El 25 de marzo 1925, Scottish inventor John Logie Baird using the principles of the Nipkow disk, able to transmit televise a mannequin head with a resolution of 28 lines and a frame rate of 14 frames per second.
(a) Baird gave the first public demonstration of the operation of a television system to members of the Royal Institution and a reporter on January 26, 1926 at his laboratory in London. In 1927, Baird transmitted a signal to 438 miles through a telephone line between London and Glasgow.
C. Electronic television
1) Created from research and iconoscope Vladimir Zworykin.
III. Telecasts
A. In 1928, he was given to General Electric's first license to operate a TV pilot season.
B. In 1936, Britain opened the first cycle of regular TV broadcasts via the BBC.
C. In 1962, he performed the first direct satellite transmission across the Atlantic.
D. On July 21, 1969 performed the first satellite broadcast simultaneously view almost everywhere in the world was the arrival of the first man on the moon, American Neil Armstrong.
E. In 1988, with the launching of the Franco-German satellite TDF-1, was launched in Europe the era of direct broadcasting, whose programs could be captured by a single parabolic dish antenna.
F. In November 1972 began the era of PAY TV, when the company Service Electric offers Home Box Office (HBO) cable system in Wilkes-Barre, Pennsylvania.
IV. Analog and digital age was
A. The analog television signal uses magnetic waves to transmit and show pictures and sound. This remained in force since the beginning of the first television broadcasts in the world until June 12, 2009.
B. The digital television signal encodes its binary signals, thus enabling the possibility of create return paths between consumer and producer of content.
1) The digital signal is classified into 3 types: Digital Terrestrial Television (DTT), Digital Cable Television (TDC) and Digital Satellite Television (TDS).
(a) The TDT is the application of digital media technologies for the transmission of content through a conventional antenna (aerial).
(b) The TDC uses the transmission of digital signals through cable television systems, telephone or coaxial type.
(c) The TDS uses satellite signals transmitted in digital format.
RELATED TO SUBJECT
1. The following video contains the manufacturing process of a plasma TV.
REFERENCES: Yahoo Questions
, Your questions, my answers , Your questions, my answers , Savitel.Es: Curiosities , 5 Centers, Books Varios.ifrance.com , Wikipedia: Caja Tonta , Google Books , Monografias.com , Portal Sedna Metro, Es.Wikipedia.Org
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