![]() An HDTV can display up to 1,080 lines, create a crisp, clear picture - but only if the source information is HD (high-definition). Most DVDs have 480 lines of screen resolution, because they were intended for use with older TVs that only have 480 lines. For a more in-depth look at analog and digital technology, see How Analog and Digital Recording Works. That digital information can be copied an unlimited number of times, stored forever and transmitted long distances without the pattern changing or degrading, as long as the digital information isn't lost or corrupted in some way. The exact sequence of ones and zeroes can be read by computers (or devices like CD players) in order to replicate the sound or image. ![]() When information is stored and transmitted in digital form, the original image or sound is transformed into information computers can understand - ones and zeroes. To the right is a graph showing the analog wave created by saying the word "hello." An analog format is one in which the physical waves themselves ( sound waves for audio or light waves for video) are either copied - as grooves on a vinyl record, patterns of magnetic particles on tape or electrical signals passing through wires and cables - or sent over the air. ![]() Audio and video information has been stored and transmitted in analog form since the inception of radio and television. ![]()
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