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

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Article #547

#547

From: Telamon
Date: Sun, 07 Oct 2007 18:37

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In article <1191780493.020305.164590@19g2000hsx.googlegroups.com>,
 SFTV_troy <SFTV_troy@yahoo.com> wrote:

> 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.

You never finnish your sentences. You mean sounds good to tin ears.

-- 
Telamon
Ventura, California

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From: Telamon <telamon_spamshield@pacbell.net.is.invalid>
Newsgroups: rec.audio.tech,rec.audio.car,rec.radio.shortwave,ba.broadcast
Subject: Re: HD RADIO is no worse than DAB or DRM radio
Organization: Internet Argonaut
References: <1191065666.205537.159420@n39g2000hsh.googlegroups.com> <1191162846.755279.319270@d55g2000hsg.googlegroups.com> <KJudnZxY2vjYFpjanZ2dnUVZ_vvinZ2d@giganews.com> <1191780493.020305.164590@19g2000hsx.googlegroups.com>
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