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Non-HD does not necessarily look horrible on an HD set.
It depends on two things: how well the line interpolation is done,
especially if it is only done once (i.e. 480i->1080i is much better than
480->720p->1080i), and most importantly whether the signal
purveyor CARES about the signal quality. They often assign far far too
few bit to upconverted 480i. Comcast it simply terrible for this.
Watch a really good DVD being sure it is converted
only once.
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