Contrast ratio: This is quite simply how black the blacks are and how white the whites are. So the higher the ratio the better the image. 1:500 no thanks, 1:3,000 yes please.
Now for a bit of personal knowledge. I have no idea wat ATSC means but QAM is Quadrature Amplitude Modulation, considered to be a very bandwidth efficient technique for modulation of signals. Really good but requiring high power to transmit the signals. They provide signals wich have very low error rate of reception. Well guess it wasnt a waste doin ECE. At least im pretty good on the communication front.
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