What about HD Radio?
"HD Radio" is iBiquity Digital Corporation's trademarked name for their
digital audio broadcasting technology. One would think that like TV, HD would
stand for High Definition. However when HD Radio was first introduced the HD stood for
Hybrid-Digital. But now Ibiquity has said that they have decided that the "HD"
in "HD Radio" stands for nothing. In any case HD Radio is lossy compressed
digital radio broadcasting—and typical
bitrates are 100, 112, 125, or 150 kbit/s of lossy data.
If the FCC discontinues analog simulcasting, each station will have over 300
kbit/s bandwidth available, which could all be used for one channel at a higher bitrate and level of sound quality—or the
bandwidth could be divided into several channels such that each channel would be
at a lower bitrate / level of sound quality. However there is also the provision
for a "fall back" condition where it reverts to a more robust but far lower
quality 25 kbit/s signal. Of course this makes it important to have a good
signal from your antenna.
NOTE: If you would like to see where the HD Radio stations are in your area
here is a