High-definition television
High-definition television (HDTV) is a television broadcasting system which uses a higher 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 signals with a 16:9 aspect ratio (width to height). This is different to SDTV (standard-definition television) which uses analog signals and a 4:3 aspect ratio.
HDTV picture resolution is at least twice that of SDTV, 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 1080p60 HDR and 1440p60 HDR.
There are different standards. Common ones are:
- 2560×1440, progressive scan, requiring about 3,68 Megapixels per frame. This is known as 1440p or WQHD. It is a new standard, which 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 past few years and is a TV boadcasting standard.
As a comparison, PAL+ is at 1024x576 pixels, and NTSC at 853x480 pixels.
Other websites
change- US Government HDTV and DTV official site Archived 2011-07-25 at the Wayback Machine
- Canadian Digital Television official website Archived 2006-02-28 at the Wayback Machine
- ATSC
