[opendtv] Re: Which Modulation Would You Choose on a really bad day?
- From: "negrjp" <negrjp@xxxxxxxxxx>
- To: "opendtv" <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 24 Sep 2006 06:46:26 -0300
Dear Friends,
COFDM X VSB controversy started in the same time of the creation of these
systems.
In 2000 Brazil it made RF covering tests with American 6 MHz ATSC's 8VSB,
European 8 MHz COFDM's DVB and 6 Japanese MHz COFDM's ISDB-T in Sao Paulo
megalopolis,using broadcast transmitters in the highest tower of the city.
The Japanese system was considered best. However, this version 6MHz COFDM
failed in 8% of the analyzed localities. Brazilian Scientists are testing a
"solution" to solve this problem with broadcasting diversity.
When I are little boy, somebody was said that the SSB would be the system of
communication of the future. Nobody said in digital communications systems,
however CW is digital...
It will be that the true controversy is digital x analog?
TTFN,
Jonas
from Brazil
> Ian Mackenzie wrote:
>
> >As you well know because of border issues Mexico and Canada
> >had no choice in selecting a DTV modulation method.
>
> I don't understand why this should be the case. Especially if Canada and
> Mexico had opted for a 6 MHz version of DVB-T, in which case the situation
> would be much as it is in Europe between PAL and SECAM countries with common
> borders.
>
> >Any settop HD in Australia will work in any other DVB country in
> >HD and SD. (They have an SD downconverted output as well as
> >the HD outputs) This is what is called a STANDARD.
>
> Do the Aussie STBs support H.264 HDTV? If not, they won't work in the only
> other DVB-T HDTV country, which is France. As to SD outputs, that's true for
> all ATSC STBs as well. They *all* have composite and S-video outputs, as far
> as I have seen, in addition to the various analog and digital HD outputs.
>
> But all of this is much ado about nothing. I showed that Philips,
> STMicroelectronics, and Micronas (at least those) already have global
> standard reference designs, and that at least one manufacturer in the UK
> already *sells* two models of global standard DTT integrated receivers, for
> what seems to be competitive prices. Why all the fuss? Who cares? If DTT
> STBs don't sell well in the US, it is caused primarily by three factors: (1)
> the vast majority prefer cable and DBS, (2) most TV sets now come with
> built-in ATSC anyway, (3) broadcasters have made it so procrastinators can
> be perfectly happy continuing to use NTSC. Probably because they're afraid
> of cable or DBS backlash if they worked to make their DTT offerings more
> fun.
>
> >The big joke is that DBS worldwide uses DVB including the USA
> >systems. OK not COFDM but the DVB-S system used is all part of
> >the integrated DVB solution of DVB-T, DVB-S, DVB-C and DVB-H.
>
> I still think this is much ado about nothing. The only significant
> difference between ATSC and DVB-T that creates all the pointless yelling is
> the physical layer -- 8-VSB vs COFDM. Take that away, and the rest is just
> the sort of obtuse silliness that broadcast standards around the world have
> always created. Whether it was different versions of NTSC, PAL, and SECAM
> around the world, the industry has obviously cherished its quite deliberate
> incompatibilities.
>
> Bert
>
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