"Serge Auckland" wrote in message
...

HD radio is an American digital radio system, roughly comparable to
our DAB,


I would personally describe them as being very different systems, but
I suppose it depends on what you mean by "roughly comparable to our
DAB". They both use OFDM for their transmission scheme, but other than
that they're very different.


but as I understand it use as a more modern form of compression than
the MP2 of DAB, but at no greater bit rates than we're using, but
which nevertheless should therefore manage better quality.


HD Radio uses a codec that is similar to AAC+, so they could use far
lower bit rates than we use with MP2 and still deliver higher audio
quality (40 kbps AAC+ provides the same level of audio quality as 128
kbps MP2 according to blind listening tests).


--
Steve - www.savefm.org - stop the BBC bullies switching off FM

www.digitalradiotech.co.uk - digital radio news & info

"It is the sheer volume of online audio content available via
internet-connected devices which terrifies the UK radio industry. I
believe that broadband-delivered radio will explode in the years to
come, offering very local, unregulated content, as well as opening a
window to the radio stations of the world." - from the Myers Report