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Article #597Re: HD RADIO is no worse than DAB or DRM radio
From: Robert Orban
Date: Fri, 05 Oct 2007 00:55
Date: Fri, 05 Oct 2007 00:55
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2262 bytes
In article <1191162846.755279.319270@d55g2000hsg.googlegroups.com>, SFTVratings_troy@yahoo.com says... > > > >Steven wrote: >> >> HD/IBOC does not employ AAC, although an earlier >> version may have IIRC. It uses something called PAC(?) > > >You have it backwards. It used to be PAC, derived from MP3. > >Early testing showed it didn't work very well, so the codec was >switched to MPEG4 AAC+SBR. No, it wasn't. The codec was changed to something iBiquity calls "HDC." It is known to use the Coding Technologies' Spectral Band Replication technology (as does MPEG HE-AAC) but its technical details are otherwise held secret by iBiquity. This secrecy has caused considerable controversy in the broadcast industry. Bob Orban
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