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

Could be.

TTFN,
Mark


Terry Harvey wrote:

>Maybe it would be more correct to say the Kell Factor was not applied to 
>system A.  That is what I meant by saying the Kell Factor is unity. (I will 
>not bring interlace into this as it would further muddy the issue.)
>
>Perhaps then the sharpness of 405 received pictures can be accounted for by 
>the excessive horizontal resolution applied.
>
>Terry Harvey
>
>
>
>At 12:09 PM 8/28/2004 -0400, Mark Schubin wrote:
>  
>
>>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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>
> 
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