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Comcast cable service is primarily aired in Standard Definition, suitable for 4x3 ratio televisions, typically CRT. Subscribing to Comcast HD unlocks channels aired in High Definition, suitable for 16x9, 16x10, and other widescreen ratio televisions, typically LCD or Plasma. Because of the larger amount of pixels and information, the picture can be seen more clearly, and small details such as type or print can more easily be read. In addition, most HD resolution content contains extra detail on the sides that normal TVs would not display.

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12y ago

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