Re: DRM -Ain't- IBOC

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Article #491

#491

From: SFTV_troy
Date: Mon, 15 Oct 2007 14:20

31 lines
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Don Pearce wrote:
> On Sat, 13 Oct 2007 10:05:11 -0700, "David Eduardo"
> >"SFTV_troy"
> >>
> >>
> >> I still don't see the difference.  Both standards are using
> >> sidebands, adjacent to the analog AM signal.
> >
> >DRM is not using a sideband; to do analog and digital requires a separate
> >transmitter for each on a separate carrier frequency. HD is a combined
> >analog and digital signal on the same carrier frequency. DRM is digital
> >only... if you want analog, you have to have a separate channel, close to or
> >not to the DRM one.
> >
>
> Exactly. DRM is a separate signal that can go wherever the operator
> chooses. ..... It is not a sideband of the AM.
> HD, on the other hand is an actual sideband of the AM carrier.




I see your point, but that seems a trivial difference.  Especially
since HD also uses a separate signal (exciter), separate from the
analog signal.  "As with AM, FM stations may use separate exciters to
modulate the very different signals." - wikipedia.

Sounds like simulcast of two signals.

Not just one.

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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: DRM -Ain't- IBOC
Date: Mon, 15 Oct 2007 07:20:19 -0700
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