[opendtv] Re: IBA Technical Review available online
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 3 Dec 2013 22:41:26 +0000
Ron Economos posted:
> The link should be:
http://tech.ebu.ch/docs/tech-i/ebu_tech-i_018.pdf
Thanks, Ron. Very interesting articles. Why digital radio is taking so long is
a really good question, ESPECIALLY in the US, where we actually have a clever
system. No impact on spectrum, most radio broadcasters are already transmitting
HD Radio (in our market, at least), so the only impact is to get receivers out
there. (My answer is that it's all about money. E.g., GM would be much happier
to sell Sirius/XM subscriptions to new car buyers, than to have them tune in to
HD Radio for the one-time, slight additional cost of the radio.)
IMO, Europe should also go to something like HD Radio (aka Ibiquity's scheme),
or the German DRM system, in preference to DAB. Why? Because what more
effective use can the 550-1620 KHz and 88-108 MHz frequency bands be put to? HD
Radio is set up to operate in hybrid mode during the transition period, without
taking up other frequency bands, so it seems an easy approach. DRM doesn't have
a true hybrid mode, but it can operate in a similar way anyway, in AM and FM
bands. DRM can use previous guard bands or spare channels, effectively
duplicating what HD Radio does. DAB, on the other hand, needs high UHF and L
Band, so switching off FM and AM to go to DAB means leaving these AM and FM
bands free of signals. Bands **no one** is aching to use.
As far as I've been able to decipher, the biggest technical concern with HD
Radio is that it slightly degrades the FM signal? And it can't be used at night
on the AM band, until analog AM goes off the air. Assuming these were real
issues, and not just an excuses, if you're trying to end FM and AM
transmissions, do these concerns really matter?
Bert
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