Television
hideTelevision (TV) is a widely used telecommunication medium for transmitting and receiving moving images, either monochromatic ("black and white") or color, usually accompanied by sound. "Television" may also refer specifically to a television set, television programming or television transmission. The word is derived from mixed Latin and Greek roots, meaning "far sight": Greek tele (τῆλε), far, and Latin visio, sight (from video, vis- to see, or to view in the first person).
Commercially available since the late 1930s, the television set has become a common communications receiver in homes, businesses and institutions, particularly as a source of entertainment and news. Since the 1970s the availability of video cassettes, laserdiscs, DVDs and now Blu-ray discs, have resulted in the television set frequently being used for viewing recorded as well as broadcast material.
Although other forms such as closed-circuit television 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.
Broadcast TV is typically disseminated via radio transmissions on designated channels in the 54-890 megahertz frequency band. Signals are now often transmitted with stereo and/or surround sound in many countries. Until the 2000s broadcast TV programs were generally recorded and transmitted as an analog signal, but in recent years public and commercial broadcasters have been progressively introducing digital television broadcasting technology.
A standard television set comprises multiple internal electronic circuits, including those for receiving and decoding broadcast signals. A visual display device which lacks a tuner is properly called a monitor, rather than a television. A television system may use different technical standards such as digital television (DTV) and high-definition television (HDTV). Television systems are also used for surveillance, industrial process control, and guiding of weapons, in places where direct observation is difficult or dangerous.
Amateur television (HAM TV or ATV) is also used for 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.
For more information about Television, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with television
3D TV -- Without the Glasses (w/ Video)
Oct 29, 2009 |
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11
(PhysOrg.com) -- Even with "active shutter" 3D technology for television sets, the wearing of special glasses is still required in order to get the proper experience. They aren't those red and blue or red and ...
Machine Learning by Watching and Listening
Technology / Computer Sciences
Oct 05, 2009 |
4.7 / 5 (7) |
0
(PhysOrg.com) -- To expand the boundaries of machine intelligence, Ben Taskar is using television shows with large fan bases like CSI, Alias, and Lost to teach computers how to be smarter about what they see, hear and read.
Whose Internet is it, anyway?
Sep 28, 2009 |
4.5 / 5 (8) |
3
(PhysOrg.com) -- Last week, the new chairman of the Federal Communications Commission, Julius Genachowski, broke with precedent by proposing federal rules that enforce Net neutrality -- the principle that ...
LG to Launch 15-inch OLED TV
Electronics / Consumer & Gadgets
Sep 01, 2009 |
4.7 / 5 (20) |
5
(PhysOrg.com) -- The Korean company, LG Electronics, the second largest television manufacturer in the world, has announced it will launch a 15-inch organic display TV set in early September. The announcement, ...
New radio chip mimics human ear, could enable universal radio (w/Video)
Jun 03, 2009 |
4.1 / 5 (23) |
2
(PhysOrg.com) -- MIT engineers have built a fast, ultra-broadband, low-power radio chip, modeled on the human inner ear, that could enable wireless devices capable of receiving cell phone, Internet, radio ...
LG Display claims world's thinnest TV panel
Dec 21, 2009 |
4.2 / 5 (11) |
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South Korea's LG Display said Monday it has developed the world's thinnest LCD television panel, measuring 2.6 millimetres (0.1 inches).
UCSD Experts Calculate How Much Information Americans Consume
Other Sciences / Social Sciences
Dec 14, 2009 |
3 / 5 (3) |
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(PhysOrg.com) -- U.S. households consumed approximately 3.6 zettabytes of information in 2008, according to the "How Much Information? 2009 Report on American Consumers," released today by the University of ...
US residents gorging on data bytes: study
Dec 09, 2009 |
2 / 5 (1) |
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If the data devoured in the United States last year were converted to text there would be enough books to bury the country under a pile seven feet (two meters) deep, according to a study released Wednesday.
Calif. requires TVs to be more energy-efficient (Update)
Nov 18, 2009 |
5 / 5 (2) |
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(AP) -- California regulators adopted the nation's first energy-efficiency standards for televisions Wednesday in hopes of reducing electricity use at a time when millions of American households are switching ...
Sezmi offers a new kind of TV service
Nov 17, 2009 |
4 / 5 (2) |
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Sezmi, a Silicon Valley startup that's pioneering a new type of TV service, is opening up a public test of its system Monday in California.
Epson's new 4K panel for 3LCD projectors
Nov 10, 2009 |
4.8 / 5 (8) |
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(PhysOrg.com) -- Seiko Epson Corporation has announced the world's first 4K panel for 3LCD (liquid crystal display) projectors. The panel will enable the projectors to produce a bright image of 4096 x 2160 ...
Solitude contributes to a person's imagined intimacy with a TV character
Other Sciences / Social Sciences
Oct 28, 2009 |
5 / 5 (2) |
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(PhysOrg.com) -- If your best friend is a guy from "The Office" or a young doctor on "Grey's Anatomy," you may be relying too much on TV shows to fill a social void in your life.
Moon crash: Public yawns, scientists celebrate
Space & Earth / Space Exploration
Oct 10, 2009 |
3.9 / 5 (19) |
11
(AP) -- NASA's great lunar fireworks finale fizzled. After gearing up for the space agency's much-hyped mission to hurl two spacecraft into the moon, the public turned away from the sky Friday anything but ...
SKorean TV giants tout differing technologies
Electronics / Consumer & Gadgets
Sep 06, 2009 |
4.3 / 5 (8) |
2
The world's top two makers of flat-panel televisions are stressing the energy-saving virtues of different display technologies in their race to dominate a huge global market.
Toshiba launches Blu-ray after DVD setback: report
Jul 19, 2009 |
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Japan's Toshiba Corp. will enter the Blu-ray DVD market, more than a year after it gave up on its own next-generation format that failed to gain industry support, a report said.
