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  1. SDTV resolution by nation; due to historical reasons, different countries use either 480i or 576i as the standard-definition picture format. Standard-definition television ( SDTV , SD , often shortened to standard definition ) is a television system which uses a resolution that is not considered to be either high or enhanced definition .

  2. en.wikipedia.org › wiki › 720p720p - Wikipedia

    However, 576i and 1080i50 (25 frame/s, 50 Hz), which are common in Europe, generally do not suffer from pull down artifacts as film frames are simply played at 25 frames and the audio pitch corrected by 25/24. As a result, 720p60 is used for U.S. broadcasts while European HD broadcasts often use 1080i50 24* frame, with a horizontal resolution ...

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