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  1. High-definition television ( HDTV) describes a television or video system which provides a substantially higher image resolution than the previous generation of technologies. The term has been used since at least 1933; [1] in more recent times, it refers to the generation following standard-definition television (SDTV).

  2. High-definition television (HDTV) in the United States was introduced in 1998 and has since become increasingly popular and dominant in the television market. Hundreds of HD channels are available in millions of homes and businesses both terrestrially and via subscription services such as satellite , cable and IPTV .

    Name
    First-launched Hd Service
    Hd Format [6]
    Category
    September 4, 2006
    1080i
    Entertainment
    September 16, 2001
    720p
    Broadcast
    March 10, 2015
    1080i
    News
    October 15, 2007
    1080i
    Entertainment
  3. Genericamente, fala-se simplesmente de HDTV para se referir à televisão de alta definição. Graças a esta variedade de formatos, por exemplo, um canal de televisão pode optar por transmitir um único programa em alta definição, ou vários programas em definição padrão.

  4. A televisão de alta definição (em inglês high-definition television, sigla HDTV ), é um sistema de transmissão televisiva com uma resolução de tela significativamente superior à dos formatos tradicionais ( NTSC, SECAM, PAL ).