[sdiy] Modular Video?

[John L Marshall]

It seems to me that vector manipulation would be most visually pleasing.

Some laser light shows use analog modules; oscillators, mixers, multipliers,
filters, and phase shifters to create a complex signal to drive mirror
galvanometers. These modules can all operate in the audio range of
frequencies. The mirrors probably respond up to only a few KHz.

Consider that the horizontal oscillator for NTSC television operates
15.75KHz. That is the frequency for one scaned line. If you want to turn
individual pixels on and off on each line will require several MHz of speed.
A television station is allocated 6MHz to do their stuff.

On the other hand, television color bar generators operate at frequencies in
the audio range.

Why not convert an old television to vector operation?


----- Original Message -----
From: Dr Strangelove <phdinfunk at hotmail.com>
To: <polarn-p at acc.umu.se>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, September 12, 2001 8:46 PM
Subject: Re: [sdiy] Modular Video?


> On a related note, about a year ago I corresponded with a William Etra.
He
> is a professor at University of Illinois (I think).  He was one of the
> inventors of the Rutt/Etra video synth.  He sells demos of his early art
> made with the system (It uses Direct video raster manipulation).  He also
> put me into contact with someone who had a schematic of the particular
unit.
>   The person said it was in terrible shape and would have to be re-drawn.
> I'm not yet at a level to build a large video synth from scratch so I
didn't
> try to acquire the schematic.  I did continue correspondance with Mr.
(Dr.?)
> Etra, who is a really swell guy.
>
> Audiovisualizers.com seems to indicate that old Buchla synths could be
used
> for video synthesis.  It sais something about they have to be video
synced.
> If someone could find out how that was done with old buchla modules,
> couldn't the same thing be done with our Moog filters, and our OTA VCAs
and
> our oscillators, and our....?  I've often thought that video synthesis (If
I
> could get spaced out pictures and patterns) would be just as fun as audio
> synthesis.  In some ways DIY makes even more sense for video synthesizers
> since there is NOTHING available commercially to make video synthesis
> (unless its computerized and d*g*t*l, which I'm assuming is not comparable
> to most of the cool looking and knobified video synthesis stuff on
> audiovisualizers, like the Rutt/Etra and the Spectron) .
>
>          -=<Jonathan Pratt>=-
>        (Phdinfunk at hotmail.com)
>
>
>
>
>
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