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
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 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, ...
Moon crash: Public yawns, scientists celebrate
Space & Earth / Space Exploration
Oct 10, 2009 |
3.9 / 5 (19) |
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(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 ...
Parents should limit young children's exposure to background TV
Jul 15, 2008 |
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Despite the fact that pediatricians recommend no screen media exposure for children under age 2, three-quarters of very young children in America live in homes where the television is on most of the time, according to research. ...
3D TV -- Without the Glasses (w/ Video)
Oct 29, 2009 |
3.8 / 5 (12) |
9
(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 ...
G19 keyboard goes way beyond typing
Electronics / Consumer & Gadgets
Mar 25, 2009 |
2.6 / 5 (15) |
6
It seems like the ordinary is no longer acceptable when it comes to the ordinary things we attach to our computers these days. For example, I'll bet the computer mouse you are using is at the very least an ...
Epson's new 4K panel for 3LCD projectors
Nov 10, 2009 |
4.8 / 5 (8) |
1
(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 ...
Researchers: Ban on fast food TV advertising would reverse childhood obesity trends
Nov 19, 2008 |
2.8 / 5 (13) |
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A ban on fast food advertisements in the United States could reduce the number of overweight children by as much as 18 percent, according to a new study being published this month in the Journal of Law and Economics. The s ...
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 ...
Panasonic Develops World's First 3D Full HD Plasma Theater System
Electronics / Consumer & Gadgets
Sep 24, 2008 |
3.8 / 5 (9) |
2
Panasonic has developed the world's first 3D full HD Plasma Theater System, which enables the viewing of true-to-life 3D images by using a 103-inch plasma television and a Blu-ray Disc (BD) player, distributing full high-definition ...
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.
Machine Learning by Watching and Listening
Technology / Computer Sciences
Oct 05, 2009 |
4.7 / 5 (7) |
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(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.
Energy Saving Televisions Have Come a Long Way
Electronics / Consumer & Gadgets
Jan 21, 2009 |
3.8 / 5 (8) |
1
(PhysOrg.com) -- With consumers being more cost sensitive, TV manufactures are coming out with innovative ways to cut power consumption on their television sets. Even when a television set is turned off, they ...
A warm TV can drive away feelings of loneliness and rejection
Medicine & Health / Psychology & Psychiatry
Apr 22, 2009 |
4 / 5 (5) |
0
Not all technology meets human needs, and some technologies provide only the illusion of having met your needs.
Quality, quantity lacking in children's educational TV, study says
Nov 12, 2008 |
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Commercial broadcasters are doing the "bare minimum and not much more" for children's educational programming, according to University of Illinois communication professor Barbara Wilson, one of two lead researchers on a study ...
