EDTV stands for Enhanced Definition Television. EDTVs typically have a native resolution of 852x480 (480p) or 1024x768. 852x480 represents 852 pixels across (left to right) and 480 pixels down (top to bottom) on the screen surface, while 1024x768 represents 1,024 pixels across and 768 pixels down. This is higher resolution than a standard non-high definition analog TV, but is not HDTV resolution. Many inexpensive Plasma Televisions are EDTVs. For a TV to be classified as an HDTV it needs have a native resolution of 1280x720 (720p) or higher.
For additional terms and definitions, check out my Home Theater Glossary
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