[opendtv] Re: Mediaflo Technology

  • From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sat, 11 Nov 2006 09:02:07 -0500

Craig Birkmaier wrote:
Looks like Tom caught you here Mark.

You can't compare apples with oranges. We are talking about Nyquist limited images in both cases - i.e. video.
As I pointed out, the edges of the smallest elements of a display violate Nyquist.

I refer you to the title of Dr. Alvy Ray Smith's Technical Memo "/A Pixel is /Not/ a Little Square, a Pixel is /Not/ a Little Square, a Pixel is /Not/ a Little Square! (and a Voxel is /Not/ a Little Cube)."/

The fact remains that in an analog system of ANY bandwidth, the peak (or trough) of a sine wave is infinitely positionable (though the precision and repeatability could be difficult). In a digital system of ANY number of samples, the position of a white (or black) sample is limited by the number of samples.

As a practical matter, low-bandwidth analog spread, high sample numbers, and Nyquist violations make calculations difficult.


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