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So as to pack in more information.

Broadcasters were required to use the same channel space when they went digital as they were originally assigned by the FCC. However, the new digital hidef information, including the surround audio, would have taken up at least six channels worth of space. By compressing the data (removing redundant info), they're now actually able to put more programming into the same amount of space.

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Q: Why do you use compression in digital television?
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