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What are the DTV formats?

Digital Television formats defined

Technical details of Digital TV broadcasting formats

HDTV, the highest level of DTV, will deliver up to 1080 scan lines, more than double the scan lines of today’s TV signals and six times the resolution. HDTV will also make it possible for TV screens to have a wide 16:9 aspect ratio, similar to movie theater screens - about a third wider than the 4:3 aspect ratio of today’s TV screen. Add Dolby Digital sound, and HDTV will deliver an entirely new experience for enjoying movies, sports and other TV programs.

To be considered HDTV, the signal must be 1080i (using interlaced scanning) or 720p (using progressive scanning). 1080i signals offer 1920 x 1080 resolution and 720p offers 1280 x 720 resolution. Either way, the signal is transmitted over a single channel at 1 million pixels per 1/60th of a second.

SDTV signals (at 480p or 480i) offer less detail, but more channels can be transmitted simultaneously using the same bandwidth as HDTV. 480p provides 704 x 480 resolution and is transmitted at half a million pixels per 1/60th of a second. 480i offers 640 x 480 resolution and is transmitted at a quarter of a million pixels per 1/60th of a second.

 

This DTV tip is reproduced from "The ABCs of DTV" with the permission of Sharp Electronics. Copyright 1998 Sharp Electronics Corporation.

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