What is High-definition television?
[[File:HD-TV Logo.svg|thumb|Logo of the service]] '''High-definition television (HDTV)''' is a [[television]] [[broadcasting]] system which uses a higher [[wikt:resolution|resolution]] than a normal television. With HDTV, people can see sharper pictures than with old television, giving a more vivid and clear screen. Most HDTV systems use [[digital signal]]s with a [[16:9]] aspect ratio (width to height). This is different to [[SDTV]] (standard-definition television) which uses [[analog signal]]s and a [[4:3]] aspect ratio. HDTV picture resolution is at least twice that of the [[Standard-definition television|SDTV]] of the 20th century, so it can present a more vivid screen than [[analog television]] or [[DVD]]. HDTV can control resolution efficiently. Many videos on the website [[YouTube]], a free video sharing app that lets people upload and view videos, are in [[1080p|1080p60 HDR]] and [[1440p|1440p60 HDR.]] There are different standards. Common ones are: *2560×1440, [[progressive scan]], requiring about 3,68 [[Megapixel]]s per [[frame]]. This is known as '''1440p''' or ''WQHD''. It became commonplace in the 2010s. It is slowly replacing many [[1080p]]-[[computer]]-[[monitors]] in the everyday use and is a YouTube HD standard. *1920×1080, [[progressive scan]], requiring about 2,07 MPixels per frame. This is known as '''1080p'''. It has been used very frequently for different types of screens in the 21st century and is a TV broadcasting standard. As a comparison, [[PAL+]] is at 1024x576 [[pixel]]s, and [[NTSC]] at 853x480 pixels. == Other websites == * [http://www.dtv.gov/ US Government HDTV and DTV official site] {{Webarchive|url=https://web.archive.org/web/20110725151723/http://dtv.gov/ |date=2011-07-25 }} * [http://www.cdtv.ca/ Canadian Digital Television official website] {{Webarchive|url=https://web.archive.org/web/20060228013041/http://www.cdtv.ca/ |date=2006-02-28 }} * [http://www.atsc.org/ ATSC] {{tech-stub}} [[Category:Television technology]]