Of course the technical aspects don't alter the lack of consumer interest with HD radio, but we do need to take a step back and try not to make the comparrison of how FM IBOC works vs. AM IBOC. Other than the same licensing organization, it's a completely different animal.
I've seen two adjacent N+1 ATSC DTV signals coming out of the same antenna with pure digital modulation 6mHz wide with no interference to each other or other channels. Assuming the filters are working correctly and everything stays within the mask, I doubt the power increase of the data carriers will be noticeable to the average listener. I suppose there will be some of the Chrysler radios from the 1990's that went into stereo blend mode with any subcarrier that may have issues, but not a deal-breaker by any means.
Really if these folks want to keep dumping money down a rat hole in developing FM-HD radio from a technical perspective, why should I care?
I've seen two adjacent N+1 ATSC DTV signals coming out of the same antenna with pure digital modulation 6mHz wide with no interference to each other or other channels. Assuming the filters are working correctly and everything stays within the mask, I doubt the power increase of the data carriers will be noticeable to the average listener. I suppose there will be some of the Chrysler radios from the 1990's that went into stereo blend mode with any subcarrier that may have issues, but not a deal-breaker by any means.
Really if these folks want to keep dumping money down a rat hole in developing FM-HD radio from a technical perspective, why should I care?