Re: HD RADIO is no worse than DAB or DRM radio

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Article #546

#546

From: SFTV_troy
Date: Sun, 07 Oct 2007 18:08

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Robert Orban wrote:
> 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.



It shouldn't be too diifficult to determine - just use a little
reverse engineering.  If it's using SBR, well that's all that really
matters.  SBR extends the high-frequency components from ~8 to 16
kilohertz, so that even an MP3 + SBR sounds good.

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From:  SFTV_troy <SFTV_troy@yahoo.com>
Newsgroups: rec.audio.tech,rec.audio.car,rec.radio.shortwave,ba.broadcast
Subject: Re: HD RADIO is no worse than DAB or DRM radio
Date: Sun, 07 Oct 2007 11:08:13 -0700
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