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Digital television
Digital television (DTV) is the sending and receiving of moving images and sound by discrete (digital) signals, in contrast to the analog signals used by analog TV.
The first country to make a wholesale switch to Digital Over-the-Air (terrestrial) broadcasting was the Netherlands, in 2006. This was followed by Finland and Sweden in 2007.[1]
In the United States, full-power television stations are scheduled to change over to digital on June 12, 2009.[2] By special dispensation, some analog TV signals will cease, as previously scheduled, on February 17, 2009.[3] This has to do with station resistance to a sudden change in schedule, that will cost broadcasters money and cause logistical nightmares.
In Japan, the switch to digital is scheduled to happen July 24, 2011. In Canada, it is scheduled to happen August 31, 2011. China is scheduled to switch in 2015. In the United Kingdom, the digital switchover has different times for each part of the country; however, the whole of the UK will be digital by 2012. Brazil switched to digital in December 2, 2007 in major cities and it is estimated 7 years for complete signal expansion over all of the Brazilian territory.
While the majority of the viewers of over-the-air broadcasting in the USA watch full-power stations (which number about 1800), there are three other categories of TV stations in the USA: low-power stations, Class A stations, and TV translator stations. There is presently no deadline for these stations, about 7100 in number, to convert to digital broadcasting.
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