Scan Converter (Lyon Lamb)
LYONLAMB
Usage
The Lyon Lamb scan converter turns computer monitor output into standard
video in real time. Thus it converts from something in the high-bandwidth
RGBS monitor patch panel into many levels of the Telect - NTSC, CAV, and
RGBS. You generally use it for recording from a live monitor session to
tape. See tutorial.
Connection
The Lyon Lamb is the general way to get live video onto tape. There's also
a special-purpose way for a specific machine: moviola has a built-in scan
converter.
Configuration Hints
-
You probably want to use the Lyon Lamb filter if you have any window borders
or other one-pixel wide horizontal lines in the field of view. The filter
will make things a little blurrier, but the really annoying jitter (which
is an interlacing artifact) will [mostly] go away. To do this:
-
Hit the Setup button beneath and to the left of the LCD screen, then hit
F2 undeneath the Conversion label on the LCD screeen, then hit the F4 key
underneath the VFocus label, then hit the F3 key underneath the Soft setting.
In my (jedavis) experience, you always want soft vertical filtering,
and almost always want soft horizontal filtering as well. It makes a huge
difference to the output quality of your video.
-
To use the zoom and pan controls on the Lyon Lamb box:
-
See the equipment page if you don't know where
the Lyon Lamb box is. Moving the mouse over the boxes will show you their
names in the lower left corner the browser if you're running Netscape 4.0
or better. It's in the fourth rack from the right, just above knee height.
-
For zooming, hit the Setup button beneath and to the left of the LCD screen,
then hit F2 underneath the Conversion label on the LCD screen, then hit
F1 underneath the Zoom label. To zoom in coarsely, use the ">" key. To
zoom in small steps use the "+". To zoom out coarsely use the "<" key,
and in small steps with "-".
-
For panning, hit Setup, then F2 underneath Conversion, then F2 underneath
the Pan/Scroll label. Switch between horizontal and vertical pan mode with
the F1 ane F3 keys. Scroll left with the "<" or "-" keys, and right
with the ">" or "+" keys.
Additional notes
-
Input B seems to have a broken green input.
-
The Sync in connector on the back takes CompSync which is a 4V sync rather
than blackburst.
-
The Composite In connector can take a blackburst signal for genlock purposes.
-
You can set radiance into a suitable mode by logging into the console in
the video lab and typing
/usr/local/bin/setres scan1280 eeprom
this will set up radiance pipe 0 channel 1 to output a format that
the lyon lamb can handle.
Troubleshooting
Q: Why do my colors look weird on the Lyon Lamb?
A:There are small switches underneath the RGB inputs on the back of
the Lyon Lamb. These should all be set to the "75 Ohm" position. Setting
them to "off" "terminates" the signal, which has the side effect of amplifying
the signal. If your colors look weird, one or more of these switches probably
has been accidentally moved to the "off" position.
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videolab@graphics.stanford.edu
Last modified: Thu Jan 27 15:08:38 PST 2000