576i
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576iis astandard-definitiondigital video mode,[1]originally used to makeanalog televisiondigital in most countries where theutility frequencyfor power distribution is 50Hz.Because of its association with older colour encoding systems, it is often referred to asPAL,PAL/SECAM orSECAMwhen compared to its 60 HzNTSCcolour-encoded counterpart,480i.
576identifies a vertical line count of 576 and theiidentifies it as aninterlacedresolution.[1]Therefresh rate,50 Hz, is sometimes including when finding out the video mode, i.e.576i50;another notation is theframe rate,endorsed by both theInternational telecommunications UnioninBT.601[2]andSMPTEinSMPTE 259Mto make it576i/25.
