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The ATSC (short for Advanced Television Systems Committee) is the Terrestrial Transmission Standard used in the U.S. and some parts of southern/central America. Transmits MPEG2 Streams but uses a slightly different modulation scheme called 8VSB instead of COFDM like DVB-T.

It has been kind of a holy war whether DVB-T or ATSC is technically more advanced. For an analysis see e.g. In In 2001, a technical report ( compiled by the COFDM Technical Group concluded that COFDM did not offer any significant advantages over 8VSB.

For a technical introduction to U.S. Digital TV systems see e.g.