On Oct 2, 10:11 am, David wrote:
3) "HD Radio" uses a codec known as HDC (a.k.a. "HD Codec"). While
iBiquity has acknowledged that it uses SBR, they have pointedly
declined to discuss whether or not it has any other similarity to HE-
AAC. I doubt that you could cite an authoritative source, but if you
could I would love to know about it.

The players (companies) are the same as the ones who implement
AAC+SBR, e.g. Fraunhaufer and Coding Technologies and Neural, aren't
they.

Of the three companies you mention, Coding Technologies is the one
that has an AAC+SBR implementation (under the tradename aacPlus).

But you miss the point. You are relying on inferences and guesswork
for something that -- whether a correct guess or an incorrect guess --
ought to be public information, but isn't. This is of great concern
to me because of its consequences.

For more information, please see:
http://fjallfoss.fcc.gov/prod/ecfs/r...t=6519550 109
and the hyperlinked footnotes within.

- Jonathan