[sdiy] Modular Video?

[Synth-DIY]

john.l.marshall at gte.net skriver:
>Why not convert an old television to vector operation?

That's one thing you could do. But if one wanted to record the images on
videotape or run the signal into a videomixer and blend/mix/manipulate it with
other sources then you're stuck with a real videosignal. Colortraces with some
sort of control are also difficult to obtain, atleast I guess, I haven't tried
color. 

However, a rasterizer would be lovely. So that one could convert a oscilloscope
like trace with voltagecontrolled XYZ into a dot on a normal TV. Then if it would
be possible to add Hue and Sauration control in addtion to the Z (Luma) it would
be great. The rasterizer has run at MHz rate but the generators creating the
patterns don't have to do that.  On the other hand if they did you get more
complex shapes.

If seen schematics on a "TV-oscilloscope" but it had a fixed trace at 50Hz (PAL
system) so basically you could only change the Y-position. Other systems, lika
Patriks, seem to use a saw+comparator to achieve a controllable dot.
I have access to schematics on a few Grassvalley videomixers but they seem all
digital. Schematics on the 70's modular videosystems would be very helpful (hint
hint!). 

I've actually done a very simple rasterizer with the Nordmodular (saw +
comparator) and it kind of works. But the NMs oscillators has a upper limit at
12kHz (yeah, really) and it cannot put out DC so it's not a good tool for
highspeed videostuff. There's also a vector cube for the NM floating around on
the net that's very cool. it's made by  another swede but I've forgotten his name.

/Per Mattsson