[opendtv] Re: 1080p transmission
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 03 May 2007 18:37:29 -0400
Bert -
What sort of bandwidth are you talking about wasting? Certainly not
transmission since the digital formats are transmitted as compressed
frames of video where nothing need be wasted in the overscan area.
And with a digital connection to a fixed pixel display there is no loss
there either.
I think that sort of Luminance bandwidth measurement is an artifact of
legacy scanning CRT's.
- Tom
Manfredi, Albert E wrote:
Ron Economos wrote:
Luminance bandwidth of 1080i and 720p is the same.
2200 * 1125 * 30 = 74.25 MHz Sample Rate = 37.125 MHz BW
1650 * 750 * 60 = 74.25 MHz Sample Rate = 37.125 MHz BW
So, are you saying that the 720p format has more bandwidth wasted on
unviewable pixels?
1920/2 * 1080 * 30 = 31.1 MHz
1280/2 * 720 * 60 = 27.6 MHz
This says that 1080i has more useful bandwidth. The computation
translates to what quality is ultimately viewable.
Also, for whatever reason, in the BBC HDTV trials, people preferred
1080i.
Bert
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Tom Barry trbarry@xxxxxxxxxxx
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