5 ms·

I'm not so sure what kind of error-correction ATSC has compared to DTB and ISTB standards, but the 8VSB modulation is not particularly great Also ISTB has the

I'm not so sure what kind of error-correction ATSC has compared to DTB and ISTB standards, but the 8VSB modulation is not particularly great Also ISTB has the idea of a 'mobile' channel, which can be useful in low SNR conditions (it is worse for pretty much anything else, though)

rescbr 5y ago
ATSC has only one FEC parameter compared to DVB-T and ISDB-T, which also have more robust modulation schemes. ISDB-T includes an interleaver that makes it more resilient to impulsive noise compared to DVB-T. ISDB-T modulation scheme is very interesting. It is comprised of 13 sub-carriers ("segments"), and by spec, one of those can be the "mobile" channel (called 1seg, as it occupies one of the 13 segments and leaves 12 for the main mux). It can have different modulation parameters from the 12 main sub-carriers, so you can make it more robust with less available bandwidth and make the main mux less robust but with more bandwidth. IIRC there are other ways to distribute the ISDB-T segments but I don't remember how out of spec it would be. Most 13-segment receivers (ie, TVs, set-top boxes, some USB adapters) wouldn't care (at least 10 years ago they didn't care) and it would work, though.