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<font face="Verdana">Interesting stuff. Unfortunately I am a software
engineer by trade, not a hardware engineer, so building my own
converter is out the question really. <br>
<br>
Can anyone recommend a decent quality, reasonably priced (< £100
sterling) VGA to PAL converter that is available in the UK?<br>
<br>
Many thanks,<br>
Ben<br>
</font>
<pre class="moz-signature" cols="72">----== Solid State Group ==----
Web <a class="moz-txt-link-abbreviated" href="http://www.solidstategroup.com">www.solidstategroup.com</a>
Email <a class="moz-txt-link-abbreviated" href="mailto:ben@solidstategroup.com">ben@solidstategroup.com</a>
MSN <a class="moz-txt-link-abbreviated" href="mailto:benrometsch@hotmail.com">benrometsch@hotmail.com</a></pre>
<br>
<br>
Michael T. Dean wrote:
<blockquote cite="mid409BB8D8.60007@thirdcontact.com" type="cite">Ben
Rometsch wrote:
<br>
<br>
<blockquote type="cite">I'd also be interested to know what the
quality of the image is like when compared to using the direct TV-Out
from a standard video card...?
<br>
</blockquote>
<br>
Read this thread
<a class="moz-txt-link-freetext" href="http://www.gossamer-threads.com/lists/mythtv/users/50643">http://www.gossamer-threads.com/lists/mythtv/users/50643</a> (updated for
the new archive--the old link didn't work for it).
<br>
<br>
Basically, it discusses using a VGA to NTSC/PAL converter and the fact
that many video cards use a very low quality converter for their
on-board converter. That coupled with the fact that the on-board
converter has to perform other conversions (color, interlacing,
timings, etc.) tend to cause the display quality to be lower than can
be achieved by using a "good" converter fed a "proper" TV-like signal
(i.e. for NTSC, 29.97Hz interlaced signal). With a proper signal, the
converter simply does a color conversion (RGB to Y/C NTSC). However,
the VGA signal cannot be output to a monitor, but provides very high
quality TV output. This would seem to explain why all TV output I've
ever seen through a VGA to NTSC converter was very low quality--the
converter was required to do far too many conversions because it wasn't
driven with a proper signal.
<br>
<br>
The only thing that wasn't discussed was the definition of a "good"
converter.
<br>
<br>
I'm building a converter based on the Analog Digital AD724 chip (which
is available from <a class="moz-txt-link-freetext" href="http://www.arrow.com/">http://www.arrow.com/</a> and <a class="moz-txt-link-freetext" href="http://www.newark.com/">http://www.newark.com/</a> ).
The design I'm using is the one for the evaluation board (
<a class="moz-txt-link-freetext" href="http://www.analog.com/UploadedFiles/Evaluation_Boards/Tools/452661188AD724eb.pdf">http://www.analog.com/UploadedFiles/Evaluation_Boards/Tools/452661188AD724eb.pdf</a>
). If you're not into buiding electronics, you can even buy a
completed board ( search for AD724EB at <a class="moz-txt-link-freetext" href="http://www.arrow.com/">http://www.arrow.com/</a> ). The
only problem is that it's about $172US.
<br>
<br>
Mike
<br>
<br>
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<br>
<br>
</blockquote>
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