[opendtv] Re: Analysis: Dethroning King Gillette
- From: "John Willkie" <JohnWillkie@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 30 Jan 2005 11:28:44 -0800
I concede the point on pixels x frames, but how does this translate to
bandwidth? Some folks seem to transmit 720 using almost the same bandwidth
as 1080i, and there have been postings hereabouts that this makes the result
for 720 better.
John Willkie
----- Original Message -----
From: "Craig Birkmaier" <craig@xxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Sunday, January 30, 2005 4:51 AM
Subject: [opendtv] Re: Analysis: Dethroning King Gillette
> At 8:41 AM -0800 1/29/05, John Willkie wrote:
> >I have a few nits to pick with this message, but this one sticks out "So
> >720p-24 requires half the bandwidth AND (because of the lower
resolution)
> >half of the processing power,"
> >
> >Seems to me that if 720p requires half the bandwidth of 1080i, then it
> >permits using 1/4th (or so) the processing power, if not much less.
> >
>
> 1280 x 720 @ 24P = 22,118,400 pixels per second
>
> 1920 x 1080 @ 30i = 62,208,000 pixels per second
>
> 1920 x 1080 @ 24P = 49,766,400 pixels per second.
>
> You can do the math John. It is just slightly less than half of the
> pixel clock needed for 1080@24P, or roughly 1/3 of that needed for
> 1080@30i.
>
> The major issue is the image processing bandwidth needed to push 2
> Mpixels to the screen. Apple is delivering a solution that can handle
> greater than 1920 x 1080 @ 60P for the 30 inch Apple Cinema Display;
> but this system requires a special dual channel video card using two
> DVI connections to get the pixels to the screen. Looks like Apple is
> comfortable with 720P resolution for the mini...
>
> Makes good sense to me.
>
> Regards
> Craig
>
>
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