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Orthogonal frequency-division multiplexing
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==== DVB-T ==== By Directive of the European Commission, all television services transmitted to viewers in the European Community must use a transmission system that has been standardized by a recognized European standardization body,<ref>{{cite web|url=http://ec.europa.eu/archives/ISPO/infosoc/legreg/docs/dir95-47en.html|title=DIRECTIVE 95/47/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL on the use of standards for the transmission of television signals|website=ec.europa.eu}}</ref> and such a standard has been developed and codified by the DVB Project, ''Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television''.<ref>ETSI Standard: EN 300 744 V1.5.1 (2004-11).</ref> Customarily referred to as DVB-T, the standard calls for the exclusive use of COFDM for modulation. DVB-T is now widely used in Europe and elsewhere for terrestrial digital TV.
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