Portal:Telecommunication
The Telecommunication Portal
Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electrical or electronic means, typically through cables, radio waves, or other communication technologies. These means of transmission may be divided into communication channels for multiplexing, allowing for a single medium to transmit several concurrent communication sessions. Long-distance technologies invented during the 19th, 20th and 21st centuries generally use electric power, and include the electrical telegraph, telephone, television, and radio.
Early telecommunication networks used metal wires as the medium for transmitting signals. These networks were used for telegraphy and telephony for many decades. In the first decade of the 20th century, a revolution in wireless communication began with breakthroughs including those made in radio communications by Guglielmo Marconi, who won the 1909 Nobel Prize in Physics. Other early pioneers in electrical and electronic telecommunications include co-inventors of the telegraph Charles Wheatstone and Samuel Morse, numerous inventors and developers of the telephone including Antonio Meucci, Philipp Reis, Elisha Gray and Alexander Graham Bell, inventors of radio Edwin Armstrong and Lee de Forest, as well as inventors of television like Vladimir K. Zworykin, John Logie Baird and Philo Farnsworth.
Since the 1960s, the proliferation of digital technologies has meant that voice communications have gradually been supplemented by data. The physical limitations of metallic media prompted the development of optical fibre. The Internet, a technology independent of any given medium, has provided global access to services for individual users and further reduced location and time limitations on communications. (Full article...)
Selected article -
Justine Ezarik (/iːˈzɛər.ɪk/ ee-ZAIR-ik; born March 20, 1984) is an American YouTuber. She is best known as iJustine, with over one billion views on her YouTube channel. She gained attention as a lifecaster who communicated directly with her millions of viewers on her Justin.tv channel, ijustine.tv. She acquired notability in roles variously described as a "lifecasting star," a "new media star," or one of the Internet's most popular lifecasters. She posts videos on her main channel iJustine.
Ezarik was known for her "300-page iPhone bill" which followed the first month of service after the introduction of the first iPhone in 2007. The viral video of her review earned her international attention. Ezarik was ranked among the top 1000 Twitter users in the world with over 1.8 million followers. Ezarik had starred on the YouTube comedy series Annoying Orange, as Orange's love interest Passion Fruit. In 2016, she was an advisor to Arnold Schwarzenegger on the reality competition series The New Celebrity Apprentice. Her television acting credits include guest appearances on Law & Order: Special Victims Unit, Criminal Minds, The Bold and the Beautiful and The Vampire Diaries. Ezarik also appeared as a main character on the first and fourth seasons of the YouTube Premium murder-mystery reality series Escape the Night. (Full article...)
General images
Portrait of John Reith, 1st Baron Reith, in 1925, founding director general of the BBC from 1922 to 1938 (from History of broadcasting)
Innocenzo Manzetti considered the idea of a telephone in 1844 (from History of the telephone)
Reginald Fessenden, the "father" of radio broadcasting in the U.S. (from History of broadcasting)
Color bars used in a test pattern, sometimes used when no program material is available (from History of television)
Naomi ("Joan") Melwit and Norman Banks at the 3KZ microphone, in the late 1930s (from History of broadcasting)
Heinrich Rudolf Hertz (1856–1894) proved the existence of electromagnetic radiation. (from History of radio)
Philo Farnsworth in 1924 (from History of television)
Manfred von Ardenne in 1933 (from History of television)
"Fiction becomes fact": Imaginary "Edison" combination videophone-television, conceptualized by George du Maurier and published in Punch magazine. The drawing also depicts then-contemporary speaking tubes, used by the parents in the foreground and their daughter on the viewing display (1878). (from History of videotelephony)
Typical low-cost webcam used with many personal computers (from History of videotelephony)
The "Kerbango Internet Radio" was the first stand-alone product that let users listen to Internet radio without a computer. (from History of broadcasting)
Donald Manson working as an employee of the Marconi Company (England, 1906) (from History of radio)
Historical marker commemorating the first telephone central office in New York State (1878) (from History of the telephone)
In the 1920s, the United States government publication, "Construction and Operation of a Simple Homemade Radio Receiving Outfit", showed how almost any person handy with simple tools could build an effective crystal radio receiver. (from History of radio)
Family watching TV, 1958 (from History of television)
The 1969 AT&T Mod II Picturephone, the result of decades long R&D at a cost of over $500M. (from History of telecommunication)
Bell prototype telephone stamp(from History of the telephone)
Centennial Issue of 1976
Philipp Reis, 1861, constructed the first telephone, today called the Reis telephone. (from History of the telephone)
Oliver Lodge's 1894 lectures on Hertz demonstrated how to transmit and detect radio waves. (from History of radio)
Reis's telephone around 1861, first device called telephone (from History of the telephone)
The Regency TR-1, which used Texas Instruments' NPN transistors, was the world's first commercially produced transistor radio in 1954. Size: 3×5×1.25 inch (7.6×12.7×3.2 cm) (from History of radio)
"Doc" Herrold is shown at the microphone of KQW, c. 1925 (from History of broadcasting)
The French Matra videophone (1970) (from History of videotelephony)
Early pioneers of radio science and technology in the United States, including Charles Steinmetz, David Sarnoff, Irving Langmuir, and Alfred Goldsmith in 1921, photographed next to the antenna feed wires of the New Brunswick Marconi Station, one of the first transatlantic radio links. The photo includes Albert Einstein as a visiting guest. (from History of radio)
Fessenden operating an underwater oscillator in 1915. (from History of radio)
Thomas Edison invented the carbon microphone which produced a strong telephone signal. (from History of the telephone)- The Marconi Company was formed in England in 1910. The photo shows a typical early scene, from 1906, with Marconi employee Donald Manson at right. (from History of broadcasting)
Ad for the beginning of experimental television broadcasting in New York City by RCA in 1939 (from History of television)
A replica of one of Claude Chappe's semaphore towers (optical telegraph) in Nalbach, Germany (from History of telecommunication)
The Nipkow disk. This schematic shows the circular paths traced by the holes, which may also be square for greater precision. The area of the disk outlined in black shows the region scanned. (from History of television)
RCA 630-TS, the first mass-produced television set, which sold in 1946–1947 (from History of television)
John Logie Baird in 1925 with his televisor equipment and dummies "James" and "Stooky Bill" (right) (from History of television)
1917 wall telephone, open to show magneto and local battery (from History of the telephone)
Broadcasting pioneer Frank Conrad in a 1921 portrait (from History of broadcasting)
Apple iPhone smartphone (from History of the telephone)
Artist's conception: 21st-century videotelephony imagined in the early 20th century (1910) (from History of videotelephony)
First television test broadcast transmitted by the NHK Broadcasting Technology Research Institute in May 1939 (from History of television)
Replica of the telettrofono at Museo Nazionale Scienza e Tecnologia Leonardo da Vinci of Milan, Italy, invented by Antonio Meucci and credited by several sources as the first telephone. (from History of the telephone)- AT&T Picturephone (Mod II) fully enclosed in its housing, control pad at bottom (from History of videotelephony)
The earliest photograph of a television picture, showing the face of Oliver Hutchinson in June 1926. The television picture was projected using Baird's television camera. (from History of television)
The master telephone patent granted to Bell, 174465, March 7, 1876 (from History of the telephone)
Guglielmo Marconi (from History of broadcasting)
DBS satellite dishes (from History of television)
Code of letters and symbols for Chappe telegraph (Rees's Cyclopaedia) (from History of telecommunication)
The Australian Broadcasting Corporation logo, first introduced in 1975 and based on the Lissajous curve (from History of broadcasting)
An early Smart TV from 2012 running the discontinued Orsay platform (from History of television)
Actor portraying Alexander Graham Bell in a 1932 silent film. Shows Bell's second telephone transmitter (microphone), invented 1876 and first displayed at the Centennial Exposition, Philadelphia. (from History of the telephone)
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Selected biography -
Paul Julius Gottlieb Nipkow (German: [ˈpaʊl ˈgɔtliːp ˈnɪpkoː]; 22 August 1860 – 24 August 1940) was a German electrical engineer and inventor. He invented the Nipkow disk, which laid the foundation of television, since his disk was a fundamental component in the first televisions. Hundreds of stations experimented with television broadcasting using his disk in the 1920s and 1930s, until it was superseded by all-electronic systems in the 1940s.
Nipkow has been called the "father of television", together with other early figures of television history like Karl Ferdinand Braun. (Full article...)
Did you know (auto-generated) -
- ... that Wyoming PBS is only available to satellite-television customers in five of the state's twenty-three counties?
- ... that Anna DeShawn started E3 Radio to help educate others about Black women that she did not learn about in grade school?
- ... that an Illinois radio station closed down to reduce interference with television reception?
- ... that Irve Tunick said he wrote about 700 to 800 scripts in his first 15 years of writing radio scripts?
- ... that Tachikawa Sumito made a hit cover in 1976 of a song that he first discovered when a housewife called into his radio show requesting to hear a version of it?
- ... that Daniel Chapo, the favorite to be the next president of Mozambique, was previously a radio announcer?
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