[opendtv] Re: HD vs. 625 vs. 525 vs. 405

Terry Harvey wrote:

>The definition of Kell Factor is the number obtained by dividing the raster 
>pitch distance by the width of the picture resolution elements.
>
No, it is not.  The common definition of the Kell factor is the 
reduction in vertical resolution from the number of scanning lines 
(although, in the age of fixed-pixel displays, it has also been applied 
to the reduction in hirizontal resolution from the number of active 
samples per line).

>Recall that system A was developed in 1935/36, before Kell and others 
>discovered that the interlaced vertical resolution was not ideal.
>
Kell did his work in the early 1930s, before System A was broadcast.

I have extensively researched Kell's work.  I would suggest that you 
look up the Proceedings of the IRE.

TTFN,
Mark



 
 
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