Digital Television

Digital television (DTV) is the transmission of audio and video by digitally processed and multiplexed signal, in contrast to the totally analog and channel separated signals used by analog TV. It is an innovative service that represents a significant evolution in television technology since color television in the 1950s. Many countries are replacing broadcast analog television with digital television to allow other uses of the television radio spectrum. Several regions of the world are in different stages of adaptation and are implementing different broadcasting standards. There are four different digital television terrestrial broadcasting standards (DTTB) and they are: Advanced Television System Committee (ATSC) uses eight-level vestigial sideband (8 VSB) for terrestrial broadcasting. This standard has been adopted in the United States and in other countries. Digital Video Broadcasting-Terrestrial (DVB-T) uses coded orthogonal frequency-division multiplexing (C-OFDM) modulation and supports hierarchical transmission. This standard has been adapted in Europe and Australia. Terrestrial Integrated Services Digital Broadcasting (ISDB-T) is a system designed to provide good reception to fix receivers and also portable or mobile receivers. It utilizes OFDM and two-dimensional interleaving. It supports hierarchical transmission of up to three layers and uses MPEG-2 video and advanced audio coding. This standard has been adopted in Japan and most of South America. Digital Terrestrial Multimedia Broadcasting (DTMB) adopts time-domain synchronous(TDS)- OFDM technology utilizing a pseudo random signal frame to serve as the guard interval (GI) of the OFDM block and the training symbol. The DTMB standard has been adopted in the People's Republic of China (PRC), including Hong Kong and Macau.

Read more about Digital TelevisionComparison Analog Vs Digital

Other articles related to "digital television, digital, television":

KULR-TV - Digital Television
... Communications Commission permission to end analogue broadcasts and operate as digital-only effective on the originally-scheduled February 17, 2009 date ...
Helen Coonan - Minister For Communications, Information Technology and The Arts - Digital Television
... In July 2004, Australia was in a transitional phase digital television was broadcast in parallel to the old analog television signals ... The stated plan was full handover to digital by 2008 and shutdown of all analog television broadcast ... dollars supporting the change from analog TV to digital TV ...
Television In Australia - History - 2000s
... ceremonies, which were amongst the most-watched programs in television history and helped Seven defeat the Nine Network in ratings terms for the first time in more than two decades ... The turn of the millennium introduced digital television to Australia, as well as the transition to widescreen standard-definition and high-definition television production ... (ABC and SBS) were the only networks that were allowed to create new digital SD Channels ...
Digital Television - Comparison Analog Vs Digital - Effects of Poor Reception
... The nature of digital TV results in a perfectly decodable video initially, until the receiving equipment starts picking up interference that overpowers the desired signal or if ... This phenomenon is known as the digital cliff effect ... as analog signals, were previously usable in a snowy and degraded state may, as digital signals, be perfectly decodable or may become completely unavailable ...
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