[opendtv] Re: Analysis: Dethroning King Gillette

At 11:28 AM -0800 1/30/05, John Willkie wrote:
>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.
>

I'm sorry if the following was NOT clear.

>  > 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...

The problem has NOTHING to do with the handling of compressed bit 
streams (typically in the range of 1 -25 Mbps). The problem comes 
AFTER the source has been decompressed, producing uncompressed images 
with the pixel clocks I cited. The 30" Apple Cinema Display has two 
DVI ports connected to a special graphics card that can pump out the 
rough equivalent of 3 Gbps, which is the bit rate for uncompressed 
1920 x 1080 @ 60P. (note that DVI uses parallel data lines, not a 
serial bus to move the samples).

Regards
Craig
 
 
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