[opendtv] Re: Which Modulation Would You Choose on a really bad day?
- From: "Albert Manfredi" <bert22306@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 23 Sep 2006 16:00:57 -0400
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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