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About HDTV : High Definition / Hi-Def Television

HDTV originates from a digital signal and has much higher resolution. Conventional television has less horizontal and vertical resolution than HDTV, which can display programs of up to 1080 lines of resolution compared to 400-700 lines of resolution in SDTV (the exact resolution depends on which SDTV broadcasting system is being used).

The width of the image is also different in HDTV, which uses a 16:9 aspect ratio (for every 16 dots horizontally there are 9 lines vertically) instead of SDTV's 4:3 aspect ratio.

Thus when 1080 lines are being displayed, an HDTV set has a resolution of 1920 dots across. This is a very big difference when compared to NTSC, the SDTV standard used in North America, which has a horizontal resolution of 720 dots and a vertical resolution of 480 lines. The result is a much larger picture for HDTV broadcasts.

Note that the HDTV aspect ratio is close to, but not the same as, the aspect ratio used in many movies.

	Digital Video Essentials: HD Basics [Blu-ray] List Price: $29.95 Sale Price: $16.94 Average Rating:
	Studio: Wea-des Moines Video Release Date: 03/25/2008

	Digital Video Essentials: HD Basics [Blu-ray] List Price: $29.95 Sale Price: $16.94 Average Rating:
	Studio: Wea-des Moines Video Release Date: 03/25/2008