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High-definition television (HDTV) is a new television broadcasting system which uses a higher resolution than a normal television. With HDTV, people can watch television in higher quality than old television, giving a more vivid and clear screen.
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.
Some videos on the website YouTube, a free video sharing website that lets people upload and view videos, are in HD.
There are different standards. Common ones are:
- 1920x1080, progressive scan, requiring about 2,07 MPixels per frame. This is known as 1080p.
- 1920x1080, interlaced, 1.04 MPixel per field. This is known as 1080i.
- 1280×720, progressive, 0.92 MPixel per frame. This is known as 720p.