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HDTV is the best form of digital television and produces images far better than ever before seen in a “home setting.” Basically HDTV provides the viewer a “movie theater experience.” Standard Definition (or SDTV) also represents a dramatic improvement allowing stations to broadcast multiple programs within the same bandwidth as an HDTV signal.
Definition of Aspect Ratio: It is the ratio of width to height of your TV monitor.
The conventional “nearly square” TV we are accustomed to today has a dimension ratio of 4:3. HDTV broadcasts are delivered in the new 16:9 wide-screen format giving you the same dimension ratio as movie theaters. This wide-view provides better DVD viewing because it displays the motion picture in its originally intended "aspect-ratio" format.
* All HDTV and some SDTV signals will in the future be transmitted with an aspect ratio of 16:9.