Re: DRM Extension Date's Moved Forwards

DAB sounds worse than FM wrote:
> > > http://www.drm.org/system/technicalaspect.php
> > >
> > > "DRM is the world's only, non-proprietary digital radio system for
> > > short-wave, AM/medium-wave and long-wave. It has been endorsed by
> > > the ITU, IEC and ETSI. While DRM currently covers the
> > > broadcasting bands below 30 MHz, the DRM consortium voted in
> > > March 2005 to begin the process of extending the system to the
> > > broadcasting bands up to 120 MHz. The design, development and
> > > testing phases are expected to be completed by 2007-2009."
> > >
> > > They first said it would be 2008-2010, so it's moved forwards a
> > > year.
> > >
> > > Still nowhere good enough. How can they seriously suggest that it
> > > could possibly take 3.5 years to extend an already designed
> > > system?
> > >
> > > Here's what they have to do:
> > >
> > > * Decide how many subcarriers and the subcarrier spacing so that
> > > the system can handle the higher Doppler shifts at higher
> > > frequencies. Simulate the changes and validate the changes. (the
> > > subcarrier spacing determines the duration of the useful part of
> > > the OFDM symbol, Tu, due to the relationship in OFDM that
> > > subcarrier spacing = 1/Tu)
> > >
> > > * decide the new guard interval durations
> > >
> > > * Ask for proposals for changes to the FEC coding. Simulate the
> > > proposals and validate the proposals.
> > >
> > > How long does all that take to implement? That amount of work
> > > (excluding the validation) isn't even worthy of an MSc project.
> > > They could easily get all of it done within 12 months *if they
> > > wanted to*.
> >
> >
> > You answered this question a week ago by saying certain companies
> > were holding back DRM to protect DAB.
>
>
> Yeah, I did. And your point is?


You get your own way and this new high frequency version of the present
DRM is developed and marketed today.

Are you expecting the broadcasters to remove\replace all the
existing DAB Tx plant and listeners to scrap unwanted DAB Rx ?

How would you implement DRM to replace DAB ?

Also what would do if someone comes along in 10 years time and develops
new technology which allows 16bit/48KHz sampled audio to be reduced
to 2.4 KB/s and requires codecs which are totally incompatible with
anything today, are you going to recommend everybody dumps DRM in favour
of this new technology.

J
.

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