The serious issue with regular ATSC is that it has poor resistance to things like movement. If you're trying to watch an ATSC broadcast in, say, a car, it's going to regularly break up due to the excessive doppler effect and changing multipath interference dynamics.
The ATSC has proposed two standards, E-VSB and ATSC-M/H, to fix these issues, although the former never took off. The standard does take bandwidth away from the regular ATSC HD channels for use with the mobile versions.
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The serious issue with regular ATSC is that it has poor resistance to things like movement. If you're trying to watch an ATSC broadcast in, say, a car, it's going to regularly break up due to the excessive doppler effect and changing multipath interference dynamics.
The ATSC has proposed two standards, E-VSB and ATSC-M/H, to fix these issues, although the former never took off. The standard does take bandwidth away from the regular ATSC HD channels for use with the mobile versions.