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High-definition televisions (HDTV) are quickly taking over the home entertainment world as they offer improved digital picture, sound and features over older technologies. An HD signal can contain around five times more picture data than a standard-definition TV signal does. High-definition TV transmissions use from 700 to 1000 lines of colored pixels to form the picture on your TV screen, whereas SDTV transmissions use only about 500 to 600 horizontal lines of pixels.