[opendtv] Re: Brazil chooses ISDB-T
- From: Mark Aitken <maitken@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 10 Mar 2006 12:19:22 -0500
In a serious vain, there was one very strong TECHNICAL reason for
adoption of ISDB-T. About 18 million people live in the greater São
Paulo metropolitan area — making it either the second or third most
populous on Earth (with approximately the same population as Greater
Mexico City). São Paulo and its rival Brazilian city, Rio de Janeiro,
have often been compared to New York and Los Angeles respectively. Today
it is the industrial and financial center of Brazil generating over 30%
of the GNP.
A lot of people, and good reason to want a dTTb system that will do the
job well (and long into the future). Because of the large number of
stations and channel allocations (I do not remember the number), with
current bandwidth requirements (6MHz channels), it is not possible to
provide a paired dTTb for each analog. Period. So, get inventive (not as
inventive as Craig would like I am afraid), and pair down the bandwidth
requirement to fit everyone. ISDB-T! There are 14 OFDM "segments" that
can be allocated for a 6MHz channel service. One can elect to apply
differing or distributed services across the segments. With a total bit
capacity of up to ~31Mb/s, with all of the same variables as DVB-T, and
the ability to provide up to 14 segmented services, lots of problems are
solved.
I think the biggest issue is one of commercialization, and "tweaking"
issues like CODECs. MPEG2 transport keeps things on balance. Knowing
what I know about Brazil, given that there is time (still) on my side, I
think it was probably a good decision. Who gets what segmentation
allocation (pick a number from 1 to 14!)...political.
If it were not for the spectrum allocation/packing issues, the choice (I
believe) would have been different, but would have (still) been OFDM of
some sort...
Mark
(hello to my friends in Brazil!)
PS - Some of this information is old recollection, but by and large, I
believe to be close.
Bob Miller wrote:
>So does that mean S. America follows suit?
>
>http://feeds.thejapannews.net/?rid=7cf7155ed90d9e9e&cat=c4f2dd8ca8c78044&f=1
>
>And when will the ATSC site announce the choice? They still have
>Argentina in the 8-VSB column after all.
>
>Bob Miller
>
>
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Regards,
Mark A. Aitken
Director, Advanced Technology
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