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So one question is what do the satellite and cable providers in Canada actually broadcast stuff in? 720p/60 or 720p/30 (I'm pretty sure I read somewhere that they all broadcast in 720p)?
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I know that some OTA broadcasts like CBC are in 1080i which according to my computer graphic card is 30Hz. Other broadcasters (Fox?) use 720p 60Hz, which is supposed to be better for sports as it handles motion better but it isn't as good picture quality.
The providers such as Bell and Shaw are supposed to send the signal just as they receive it but Bell doesn't as they can cram more 720p signals onto a transponder than they can 1080i, so all their stations are 720p.
Whether 120Hz or 240Hz is better for fast moving sports like hockey, I can't really say as it may just be that the higher end TVs with 120Hz just have better parts but I've heard of people turning off the motion adjustments when watching film and turning it on for sports. On a personal level I have an old 1080i CRT HDTV that has no problem handling motion. I also have a 240Hz LCD and it handles motion better than my 120Hz TV but for me neither are distracting.