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Originally Posted by agnerc
I was watching a show tonight on CBS and when the show started it said it was being broadcast in HD. So if I am watching this show on my 1080i 50" widescreen and I do NOT have an HD DVR box or HD programming, then I am still watching the show at 480p, correct?
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If you have a standard cable box, the signal coming in is 480i. Your set probably deinterlaces the signal and possibly scales it. The exact details depend on what sort of TV it is and its "native resolution".
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Second question, if I get an HD DVR box and sign up for HD programming then I will be able to watch that show in HD and will it be on the same channel?
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You'll be able to watch the show in HD, but it will be on a different channel. Until February of next year, broadcasters are transmitting both the analog old non-HD signal on one channel, digital (HD or not) on another. The cable company typically maps it to a virtual channel # on the box. E.g. around here CBS analog is on ch 5, the HD signal is on 705.
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Third question, when the networks shoot these shows, they are using HD equipment and transmitting the shows to me in HD signal but since I do NOT have an HD DVR or HD programming then my current DVR box is having to convert that signal to an SD 480p signal, correct?
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No, your current DVR box is recording from either analog 480i signal that the cable company is retransmitting, or a digital simulcast copy of that analog 480i signal. The HD signal is on an entirely different channel, which your non-HD DVR box can't handle.