RGB outputs from Pocket AV Generator
Referring to the Pocket AV Generator described in the June 2006
issue, is it possible to derive RGB signals from IC1 to an external socket? This
would be ideal to test a data projector. When I worked at TV, "PLUGE" stood for
Picture Line Up Generating Equipment. (K. T., Auckland, NZ).
You could derive 1V
RGB signals with a simple voltage divider and three wideband buffering stages,
however when you say "data projector" we suspect you’re implying a VGA source.
If this is the case you will need separate horizontal and vertical sync signals
and/or different scan rates.
The 16F84A from the SC TSG generates a composite sync signal
which may be unsuitable. It might be better to look for a software alternative
with a Google search on monitor test patterns which may be a more appropriate
solution as you can use any PC as the generator source. The following link
should put you on the right track: http://www.construnet.hu/nokia/
Monitors/TEST/monitor_test.html
As for PLUGE, you’re quite right. It is an acronym for Picture
Line Up Generation Equipment. In broadcast circles a "Pluge pattern" is known as
a test signal used to calibrate the black level of a video monitor.
