[opendtv] Re: Half Truths - Was More 1080p@60
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 9 Dec 2007 10:14:46 -0500
At 3:19 PM -0500 12/8/07, Albert Manfredi wrote:
Craig Birkmaier wrote:
If we had switched to 60 fps for DTV, it would be necessary to have
a conversion box to feed the NTSC transmitter at 59.94.
That was exactly my point, although of course I was assuming that
the 60 Hz issue continues to exist. Cliff disagrees. If the issue
doesn't exist anymore, then ATSC already allows for 24/30/60, so it
would be up to broadcasters and networks to stop using the odd rates
in production. Same sort of thing which also applies to interlace
over ATSC (or DVB-T). When its reason for existing goes away,
essentially with CRTs, it can simply be dropped.
I did not interpret Cliff in this way, but it raises an interesting question:
Do the legacy NTSC receivers that are still in use have the ability
to lock up to a source stream that is broadcast at 60 Hz rather than
59.94 Hz?
If the answer is yes, then we should have abandoned 59.94 at the
BEGINNING of the DTV transition.
Has anyone ever tried this with 60Hz source?
If receivers are/were NOT the problem, then broadcasters are the
problem. The question then becomes, will modern broadcast gear lock
up to a 60Hz reference?
Apparently nobody in this thread fully understand the problem
Whether that's true or not, I would say that apparently no one was
considering *why* the odd rates were being retained, until Cliff
yesterday, responding to my post. I saw a lot of careful explaining
how inconvenient the odd rates are in production, which is not in
dispute. Cliff seems to believe that there is no reason to retain
the rates even for analog transmission, so of course that would
change things. But again, ATSC does not mandate their use. It just
allows it.
There were many discussions about this when the standard was being
developed. SOme people suggested that we could switch after the
transition. But I have heard noting more about this since.
So once again Bert, thanks for giving this proposal the "incredible"
designation!
Always happy to oblige!
:-)
Regards
Craig
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