[opendtv] Re: 1080p: Time for a Reality Check
- From: John Golitsis <john@xxxxxxxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 7 Jul 2005 10:33:53 -0400
=46rom a posting I made on another forum:
=3D=3D=3D=3D
Quote:
"First off, there is no 1080p HDTV transmission format."
=3D=3D=3D=3D
WRONG! 1080p at 24 and 30 frames per second is part of ATSC A/53 =20
Table 3 - Format Constraints. Any set-top box on the market today =20
should be able to receive and process a signal in those formats.
=3D=3D=3D=3D
Quote:
"What=92s that, you say? Those 1080p/24 could be broadcast as a digital =20=
signal? That=92s true, except that none of the consumer HDTV sets out =20=
there would support the non-standard horizontal scan rate required."
=3D=3D=3D=3D
Huh? First he says there's no 1080p transmission format...then he =20
says it could be broadcast as a digital signal? WTF?!
He's right about the TV, but that doesn't mean I won't see a picture. =20=
My set-top box will convert that 1080p signal to whatever output =20
format I've specified (1080i, in my case).
=3D=3D=3D=3D
Quote:
"And you sure wouldn=92t want to watch 24Hz video for any length of =20
time; the flicker would drive you crazy after a few seconds.
No, you=92d need to have your TV refresh images at either a 2x (48Hz) =20=
or 3x (72Hz) frame rate, neither of which is supported by most HDTVs."
=3D=3D=3D=3D
WHAT? 48Hz? 72Hz?? Surely Mr. Putman has heard of 2:3 pulldown?! Show =20=
frame 1 twice, frame 2 thrice, then repeat. Gives you 60Hz.
First he says your TV would need to change the refresh rate, then he =20
says the TV would not be able to display the refresh rate it just =20
change it to!
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
And then that stuff about needing a PC to generate different scan =20
rates? Sheesh!
That was really as far as I've read.
On 6-Jul-05, at 3:43 PM, Mark Aitken wrote:
> Can you take the time to detail some of the mistakes beyond "there =20
> is no
> 1080p HDTV transmission format"? Or, is the lost interest based on
> maybe, just maybe, some folks might actually put off whipping out the
> credit card for a purchase? Because if that's the case, I really think
> this one should stop folks in their tracks!
> <http://www.iht.com/bin/print_ipub.php?file=3D/articles/2005/07/04/=20
> business/3d.php>
>
> John Golitsis wrote:
>
>
>> http://www.hdtvexpert.com/pages/reality.htm
>>
>> I lost track of the mistakes - and all interest - in this article
>> after the first few paragraphs! Pete, if you're on this list, you
>> should know better!!
>>
>>
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