High Definition
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High Definition Television

it had to happen soon or later that the technology that drove the proliferation of the home computer would be applied to the family television. With the integration of computers into TV the result has been a major increase in the clarity and resolution of the picture. The biggest change that as led to true high definition television is how the picture is presented on the screen. In the classic television that most of us grew up with the picture was traced by a beam of electrons on light producing material on the screen. First the odd lines of the picture was drawn followed by the even lines. This is referred to as interlaced picture formation. The result was some flickering of the picture as it is drawn. For American televisions there where 480 of these lines. Borrowing from the computer monitor the modern high definition television uses discrete dots of color, pixels. Computer type memory in the TV allows the picture to be built and sent to the screen as a whole, progressive scan technology. Also gone is the square 4:3 aspect ratio. High definition sets have a widescreen picture with a ratio of 16:9 or about 1.78 units of length to each unit of height. The number of lines of picture has also grown from 480 to 720 or, on the high end sets, 1080. 

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