Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects simply to a non-technical, business audience. Over…
Digital terrestrial television (DTT or DTTV) is television signals
broadcast over the air to be picked up over the air using an antenna rather than
over cable or satellite. In several countries, DTT has replaced analog
television, with analog broadcasting discontinued. Digital terrestrial
television typically offers HDTV signals as well as more efficient use of the
Digital terrestrial television broadcasts have become widely available in most developed countries. In several places, analog broadcasts have been discontinued. In the U.S., analog TV stations left the air in 2009.
There are several standards for digital terrestrial television used throughout the world. In the U.S., Canada and Mexico, the ATSC standard is used. DVB-T is used in Europe, Australia and most of Africa and Asia. Japan and most of South America use ISDB-T. China uses its own DTMB-T/H, including Hong Kong as well as Cuba.
Digital terrestrial television’s main advantage is its more efficient use of the radio spectrum, which allows regulators to reclaim bandwidth for things like emergency response. The efficient bandwidth also allows operators to offer digital sub-channels. The main advantage to viewers is the ability to access HD content without paying subscription fees for cable or satellite.
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Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.
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