Thread: HD RADIO is no worse than DAB or DRM radio
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Old October 5th 07, 01:55 AM posted to rec.audio.tech,rec.audio.car,rec.radio.shortwave,ba.broadcast
Robert Orban Robert Orban is offline
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First recorded activity by RadioBanter: Oct 2007
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Default HD RADIO is no worse than DAB or DRM radio
In article .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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