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
Despite some benefit, drug ads can be harmful to your health
19 hours ago |
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While the debate over prescription drug advertising persists, a new study released online in the American Journal of Public Health offers guidelines for improving drug ads in order to minimize potential harm and maximize ...
New software shows British TV live on iPhone
Nov 10, 2009 |
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British broadcaster Sky launched an iPhone application Tuesday which allows viewers to watch live TV on the move and is thought to be the first commercial TV service backed by the broadcaster itself.
Epson's new 4K panel for 3LCD projectors
Nov 10, 2009 |
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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 ...
Brazil blackouts result of cyber hacking: report
Nov 07, 2009 |
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Massive power outages in Brazil in 2005 and 2007 that impacted millions were caused by cyber hackers attacking control systems, the US television network CBS said Sunday.
TV Exposure May Be Associated With Aggressive Behavior in Young Children
Nov 02, 2009 |
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(PhysOrg.com) -- Three-year-old children who are exposed to more TV appear to be at an increased risk for exhibiting aggressive behavior, according to a new report co-authored by a researcher from Tulane University School ...
3D TV -- Without the Glasses (w/ Video)
Oct 29, 2009 |
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(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 ...
Solitude contributes to a person's imagined intimacy with a TV character
Other Sciences / Social Sciences
Oct 28, 2009 |
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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.
Crowded theaters build momentum for 3-D at home
Oct 25, 2009 |
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(AP) -- Fans scrambled to see 3-D movies such as "Cloudy with a Chance of Meatballs" in theaters this year and new 3-D televisions could soon have home viewers feeling as if they're surrounded by a spaghetti ...
First White Spaces Network Brings Broadband Internet to Rural America
Oct 21, 2009 |
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For the first time in the U.S., unused TV broadcast channels freed up by the transition to digital TV are being used to wirelessly deliver high-speed Internet connectivity to business, education and community users. These ...
Comcast to debut cable shows online by year's end
Oct 20, 2009 |
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(AP) -- You'll be able to watch popular cable television series such as HBO's "Entourage" and AMC's "Mad Men" on your computers by the end of the year without paying extra - as long as you're a Comcast Corp. ...
Television has less effect on education about climate change than other forms of media
Other Sciences / Social Sciences
Oct 16, 2009 |
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Worried about climate change and want to learn more? You probably aren't watching television then. A new study by George Mason University Communication Professor Xiaoquan Zhao suggests that watching television has no significant ...
New research by law professor analyzes efficacy of the FCC's current rules
Other Sciences / Social Sciences
Oct 15, 2009 |
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University of Miami Law Professor Lili Levi has recently authored a research paper titled "A 'Pay or Play' Experiment to Improve Children's Educational Television."
State-owned firm says Vietnam's first 3G service launched
Oct 13, 2009 |
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State-owned mobile network operator Vinaphone said Tuesday it has begun offering Vietnam's first 3G service, bringing "a revolution" to the country's mobile system.
Moon crash: Public yawns, scientists celebrate
Space & Earth / Space Exploration
Oct 10, 2009 |
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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 ...
Sony Intros New Touch-Screen HD PC/TV
Oct 08, 2009 |
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(PhysOrg.com) -- Sony today unveiled its new touch-enabled, multi-media machine— the VAIO L Touch HD PC/TV.
