In ATTC's testing, unfortunately, they found two models of DTT receivers that could not handle 720 x 480 imagery at certain frame rates (different rates for the two receivers). 720 is not only in Rec. 601, but it is also divisible by 16. Unfortunately, it's not in the infamous Table 3.During the development of our ATSC DVD recorders at LSI, *we tested all 36 formats* and much more (sub-sampled horizontal resolutions, telecine flags in both1080i and 720p, QAM, bad PSIP, high BER, etc.).
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