The Digital Fact Book - Quantel

TV standards descriptionsTV standards are written in many different ways. The method used in this book is shownbelow and follows how they appear in ITU-R BT 709: i.e. –Number of pixels per line x number of lines per frame/vertical refresh rate (in Hz)progressive or interlaced (P or I). For example:1920 x 1080/50INotes:1) The vertical refresh rate shown for interlaced scans is twice the whole frame rate(two interlaced fields make up one whole frame). This assumes that interlace is only ever2:1 (theoretically it can be greater but never is for broadcast purposes). So 1920 x 1080 50Ihas 25 whole frames per second.2) Digital standards are usually quoted for the active lines and pixels only – so no blankingspace is includedExamples:Digital SDTV in Europe720 x 576/50I(analog equivalent is 625/50I that includes 49 lines of blanking)An HD standard in USA1920 x 1080/30PBrief formatLines per frame/vertical refresh rate, progressive or interlaced e.g.: 1080/30P9