[opendtv] Re: Frames Per Second of 720P
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 26 Jul 2008 15:19:34 -0700
A/97 can be used to update the RF section of receivers? I'd really like to
see that, since I've never heard of any television receiver that used SDR
(software defined radio) techniques. Aren't the SDR receiver
implementations still more expensive than entire tv sets? I certainly know
that they are much more expensive than traditional tv rf sections.
So, show us your work that 1) establishes that A/97 will permit updating of
receivers offered at common price points and 2) that you know exactly what
the modulation/coding that will be used in M/H.
Here's a reasonable guess: even Samsung (co-owner of the A-VSB technique)
won't offer M/H reception in television sets being made today or even later
this year.
Funnily enough, I'm not even sure at this point that A-VSB uses a different
modulation technique than 8-VSB. That's why I call it modulation/coding. I
do know that the coding is different than 8-VSB, and this knowledge isn't
bound by an NDA.
By the way, "backwards compatibility" in improvements is a tenet of the
ATSC. Much effort is taken to insure that improvements do not break
existing implementations.
By the way, a review of public ATSC documents will provide those interested
with proof that work has already been done to introduce h.264/avc and VC-1
into ATSC transport streams, and that work was made public years ago. I'm
not in a position to say anything about the status of the work, if only in
an abundance of caution.
It's better to ask questions than to make statements in areas where you are
totally uninvolved. There is much change in the various ATSC work plans,
and this isn't limited to mobile and handheld.
John Willkie
-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Albert Manfredi
Enviado el: Saturday, July 26, 2008 2:56 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: Frames Per Second of 720P
Craig Birkmaier wrote:
> We were having a discussion about the ATSC standard
> already being out of date, particularly with respect to the
> installed base of ATSC receivers, which will not be able to
> access the mobile services.
Yes, exactly the same situation as DVB-H. Exactly the same as HDTV in
European DTT systems, also. But not as disruptive as DVB-T2, which is not
backward compatible with DVB-T receivers.
This is what happens when standards are updated. You always try to make it
so legacy equipment isn't made totally useless. POTENTIALLY, although I'm
pretty positive this is not the case for any existing products on the
market, A/97 could be used to update equipment to receive the new
broadcasts.
> THere is little doubt that once the standard for mobile is
> adopted, that we may see new fixed location TVs add
> support for the mobile and infrastructure enhancements.
I don't think this has been the case with DVB-H, but maybe I'm wrong. It
would be good, though, to see more robust modes of ATSC making it to all
receivers. And yes, as you say, that would introduce H.264 into ATSC.
Exactly the same as introduction of HDTV is being used in Europe to
introduce H.264 into DVB-T.
> So this is not a zero sum game. One could even suggest
> that this is a backdoor way to enhance the ATSC standard.
Not being involved with the ATSC in any way, I don't perceive this as "back
door" at all. Seems like a straightforward enhancement, done through the
front door. That is, unless there's some sort of anti-change religious dogma
going on at the ATSC, that preaches unchanging standards for fixed
receivers.
Bert
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