Re: DRM -Ain't- IBOC

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Article #494

#494

From: David Eduardo
Date: Mon, 15 Oct 2007 15:36

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"SFTV_troy" <SFTV_troy@yahoo.com> wrote in message 
news:1192458019.445135.155400@q3g2000prf.googlegroups.com...
>
> 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.

On the same carrier for HD, on separate carriers for DRM. DRM is a pure 
digital system, and if analog is also employed, it is on a separate 
allocation, close or not so close to the digital frequency.

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From: "David Eduardo" <david@davideduardo.com>
Newsgroups: rec.audio.tech,rec.audio.car,rec.radio.shortwave,ba.broadcast
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Subject: Re: DRM -Ain't- IBOC
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