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
Suggestions for tech-happy holidays
Electronics / Consumer & Gadgets
Nov 25, 2009 |
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The holiday season is as much a time for tech as for toys. Electronic gadgets are at the top of many wish lists and account for an ever-growing share of holiday shopping budgets. Fortunately for shoppers, tech gifts don't ...
Comcast bid for NBC Universal could be sealed next week: source
Nov 25, 2009 |
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Comcast's bid to buy a controlling stake in NBC Universal from General Electric could be sealed next week if GE reaches an agreement with Vivendi, a source close to the matter said Wednesday.
Search results for television
Roku adds more 'channels' of video and other digital content
Nov 26, 2009 |
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Owners of Roku's digital video player will soon have a bunch more channels to choose from.
ISS astronauts land safely in Kazakhstan
Space & Earth / Space Exploration
23 hours ago |
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A space capsule carrying a Belgian, a Canadian and a Russian landed safely in the steppes of Kazakhstan on Tuesday after the trio spent half a year on the International Space Station (ISS).
Apple's iPhone set to make splash in South Korea
Nov 27, 2009 |
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(AP) -- The iPhone's arrival in South Korea is generating considerable buzz among consumers and industry watchers amid expectations it will shake up a market dominated by world-beating domestic manufacturers.
Michael Jackson tops Web's search charts in 2009
Dec 01, 2009 |
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(AP) -- Michael Jackson's stunning death made him the Internet's biggest star this year.
Signal fading on radio traffic reports
Nov 27, 2009 |
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(AP) -- For more than 20 years, Mike Nolan was known to radio listeners as the "eye in the sky." He flew over Southern California freeways in his single-engine plane, reporting on the nation's worst traffic.
South Africa to treat all HIV-positive babies
Medicine & Health / HIV & AIDS
11 hours ago |
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(AP) -- South Africa announced ambitious new plans Tuesday for earlier and expanded treatment for HIV-positive babies and pregnant women, a change that could save hundreds of thousands of lives in the nation ...
For stars, high-tech gaffes hard to hide
Nov 28, 2009 |
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(AP) -- So, you fail to take a deep breath and to count to 10 - and you post something you probably shouldn't on Twitter or Facebook, or somewhere else online.
Web sites aim to survive with hyperlocal focus
Nov 25, 2009 |
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Finding a financially viable way to provide local news is a challenge large metropolitan newspapers are confronting. But a Coral Gables, Fla., Web site is among a few locally with faith it can succeed.
List of search results for television
