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Digital Terrestrial Television (DTT) is the application of digital media technologies for the transmission of content through a conventional antenna (Air). Applying digital technology is getting more likely, as providing a greater number of channels, better picture quality or picture in high definition (HD or High Definition in English) and better sound quality (using systems such as AC3). The technology used is ATSC in North America, ISDB-T in Japan, and DVB-T in Europe, Australia, Africa and some South American countries. The rest of the world has not yet been decided. ISDB-T is very similar to DVB-T.
In Spain in 2000 began operating the first commercial platform Digital Terrestrial Television (DTT) in Spain, Quiero TV, payment platform that did not achieve the expected return and different ceased broadcasting on June 30, 2002. On November 30, 2005 saw the relaunch of the system to begin their digital broadcasts to open the channels at that time broadcast in analog while incorporating new issues opened specially for the occasion and provided new channels for DTT only .
DTT allows an improvement in reception quality and extend the available supply in number of channels and versatility of the system: issue with multichannel sound, multiple audio, teletext, EPG (Electronic Program Guide), channels radio, interactive services, panorama, etc. In the medium term analog television system will disappear completely freeing frequencies will increase the number of channels, quality and other services on DTT. The DAB digital radio system also began broadcasting in 1998 but appears in practice to be unworkable and / or unprofitable, its reception in the absence of many receivers on the market.
In Latin America, Mexico, given its proximity to the border with the United States chose to implement the ATSC standard. Uruguay
select calls DVB-T/DVB-H standards "for the implementation of Digital Terrestrial Television in Uruguay" DVB-T standard is the European digital terrestrial TV while DVB-H (handle) is the standard for mobile TV.
Colombia after several technical tests conducted by the National Television Commission and a rigorous socio-economic impact study conducted by the University of Antioquia, chose the DVB as the best alternative for digital terrestrial television.
Brazil after making a major trade agreement with Japan, the implementers decided estadandar ISDB with some technological changes.
Argentina had adopted the ATSC standard in 1998. But in May 2007 has made an evaluation committee to decide which of the three most widely used standards would eventually be more convenient.
Chile has opened a heated debate about the standard to be used, which is not chosen yet. [1] Now the discussion is between the three standards, Chile is testing the 3 digital TV standards DVB-T, DVB-T and ATSC in the homes of people who voluntarily offered to test and evaluate each standard.
worth noting that again, as was the time to choose the color television standards (PAL, NTSC or SECAM), there is no consensus for the adoption of a regional standard for all of South America, nor the Mercosur although Brazil has suggested, because countries in the region have similar cultures and geographical features, leaving the ISDB-T front of others. Due to their strength of the transmission, free and middlewar (interactivity), developed for the Latin American reality.
Source: http://es.wikipedia.org/wiki/Televisi% C3% B3n_digital # TDT_Televisi.C3.B3n_Digital_Terrestre