[mythtv-users] Choosing a HDTV for myth usage

Michael T. Dean mtdean at thirdcontact.com
Sat Aug 19 17:31:23 UTC 2006


On 08/16/06 20:09, Craig Partin wrote:

>So assuming quality wiring and the absence of ground loop problems
>then VGA is as good as DVI for feeding signal to the TV, particulary
>HD signal?  There is no loss in the D/A and A/D conversions?
>

Why digital is not necessarily better than analog and why analog is not 
necessarily better than digital:

http://forum.ecoustics.com/bbs/messages/34579/122868.html

Basically, DVI signal is designed for coaxial wires but DVI cables use 
twisted pair, introducing signal reflections which often result in bit 
errors.  VGA (and other analog formats) require a D/A conversion (which, 
depending on display may require an A/D conversion) but the signal tends 
to be robust enough to work well even on low-quality cabling.  Neither 
DVI nor VGA (nor component) use any form of error correction, so losses 
occur in both.

So, unless you work in the marketing department for a cable 
manufacturer, don't believe that digital is "just better."  You won't 
know which is better (for you) until you've tested both.  (And, you're 
unlikely to see a big enough difference to warrant purchasing additional 
cables/equipment to test both.)

Mike


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