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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. Introduced in the late 1990s, this technology appealed to the television broadcasting business and consumer electronics industries because it offers new financial opportunities. Digital television is more flexible and efficient than analog television. When properly used by broadcasters, digital television can allow higher-quality images, sound, and more programming choices than analog does. However, a digital signal does not necessarily carry a higher-quality image or sound than an analog signal. After February 17, 2009, full-power television stations in the USA will broadcast in digital only. In Canada, this will happen Aug. 31, 2011. While the majority of the viewed TV broadcast stations are full-power stations, about 1800 in number, there are three other categories of TV stations that exist“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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