[opendtv] Re: Digital radios outstrip analogue Shortwave ?
- From: dmenolan <dmenolan@xxxxxxxxxxxxxx>
- To: Open DTV list <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 2 Mar 2005 11:13:13 -0500
Hi Jeroen,
A good web site which discusses all these issues is digitalradiotech.co.u=
k. Actuallt T-DMB is just MPEG4 DAB and has the same spectrumm efficiency=
problems and power consumption issues as DAB: which is why you would pre=
fer DVB-H also as a radio solution as well in the VHF band because of its=
very efficient battery power consumption. As one of the other posters po=
inted AAC or AAC+ at 64kb/s simply beats the pants off the old MPEG1 audi=
o used in DAB. Its interesting to note that a number of countries are byp=
assing DAB for digital radio via DVB-H eg France and Ireland: this makes =
sense as a) DVB-H will be churned out for cellular TV b) its very likely =
that those who make DVB-T chipsets will simply switch to DVB-H (as its ba=
ckwards compatible with DVB-T and c) there will be considerable economies=
of scale flowing from use in conventional DTV, digital radio and cellula=
r TV using the same base technology. I am very well aware of DRM for LW a=
nd SW radio: that will be very interesting as there are propagation probl=
ems in those bands designed for very long distance reception. The main pr=
oblem is that, apart from spooks and monitoring services, shortwave radio=
is not popular in industrialised countries anymore as people prefer loca=
l AM/FM stations. It is still very popular in developing countries and if=
you don't have internet access. I don't see analogue radio being phased =
out anytime soon because of the very large number of radios in use in the=
home and because it occupies far less spectrum than analogue terrestrial=
TV. Digital radio is likely to coexist side-by-side with analogue radio =
for years and only digital radio systems which can be operated by battery=
have a prayer of relacing their analogue predecessors.
Kind Regards,
Dermot Nolan
-------------Forwarded Message-----------------
From: INTERNET:opendtv@xxxxxxxxxxxxx, INTERNET:opendtv@xxxxxxxxxxxxx
To: , INTERNET:opendtv@xxxxxxxxxxxxx
=
Date: 02/03/105 14:10 PM
RE: [opendtv] Re: Digital radios outstrip analogue Shortwave ?
=
Quoting jeroen.stessen@xxxxxxxxxxx:
> The real replacement for DAB would be DRM (Digital Radio
> Mondiale, not Digital Rights Management): http://www.drm.org/
>
> Dermot will love this quote:
> "The robustness of the DRM signal can be chosen to match different
> propagation conditions."
>
> DRM was designed to replace AM radio, especially the long-
> distance short-wave radio, where fading due to multipath
> reception is an annoying problem. One former colleague, who
> used to work on DAB, has now moved to another company to
> work on DRM. Who knows, this may finally be the radio that
> works well everywhere.
>
But...hold on a minute.
The beauty of international shortwave is that it can be picked up on old =
and
primitive radios--perhaps even home-made ones--in countries where =
truth, money,
and access to consumer goods are restricted. At least that was the =
premise that
I understood when I did some work with VOA.
So, am I hearing it right that there is a move afoot to "improve" interna=
tion
shortwave -- especially in a way that means that lots 'o new, =
state-of-the-art,
non-home-buildable radios need to be purchased?
Am I missing something here?
Richard L. Hess
Vignettes Media
Aurora, Ontario, Canada
http://www.richardhess.com/tape/
=
=
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Date: Wed, 2 Mar 2005 09:08:44 -0500
From: "Richard L. Hess" <lists@xxxxxxxxxxxxxxx>
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Digital radios outstrip analogue Shortwave ?
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