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<<The TV you watched was not setup properly (sharpness was probably too high) or you were watching an interlaced HDTV of a very, very fast moving sport. Many of the newer TVs use a progressive signal (720P) and this does not have the one half screen refresh issues that you see on 1080i. >>
Also depends (on over-the-air stuff anyway) on whether the network is running any subchannels of standard def material. A 720p broadcast will hardly be affected at all by one subchannel, or even two depending on how much bandwidth they give it. But a 1080i can have MUCH more noticeable degradation (pixelization on dissolves, fast action and flashing) than a standalone HDTV channel. Or you can even see pixelization creeping in on a single channel if they are not giving it the full bandwith (19.2 bps or whatever the max is).
If it were up to me, I would eliminate subchannels when broadcasting HDTV on the main channel, OR just go with 720p if they insist on using subchannels.
If it's a single HDTV channel getting full bandwidth, pixelization is pretty rare except during the occasional extremely demanding material. As for cable I don't have it but I'm sure there are pixelization issues with that as well for the same reasons...Frenchy
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