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Maybe I can make this clearer by breaking the question down further:
1. Do I need one set of cables or two sets of cables (one for sd and one for hd) going between the cable box and the television?
If the answer to this is one set of cables, then I assume that the tv will automatically know how to process the input signal. If the answer to this question is two, then I have another question:
2. When switching from a sd to a hd channel, do I need change the input selection on the television?
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