Looper's Delight Archive Top (Search)
Date Index
Thread Index
Author Index
Looper's Delight Home
Mailing List Info
[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Date Index][Thread Index][Author Index]

Re: OT:Any Video Loopers?

Warning, contains no actual looper content.
---David Myers  wrote:

> In this vein, ten years ago when I did Feedback Music performances I
hooked
> up an oscilloscope to my L&R outputs to get Lissajou (sp?, sorry)
patterns
> which my video buddy trained his camera on.

Yes, in the 1970s (and the last few weeks)  we created Lissajous'
patterns using 2 MOOG synths (or recordings of same) feeding 2 amp
channels, each driving a voice coil actuator that moves a front
surface mirror.  One mirror moves angularly in the  x axis, one mirror
moves in the  y axis.  Project a laser beam from 1 mirror to the
other, then to a wall or ceiling for projected Lissajous patterns. 
Years ago we used he-ne lasers, which are both large and fragile. 
Todays solid state laser diodes are a low cost, small source of point
light.  

The moogs allow more complex waveforms than the traditionally used
sine waves, and thus can create much more complicated images.  The
limited bandwidth of the voice coil/mirror assembly requires that you
keep the fundamental frequency of the signals rather low (up to a few
hundred hz).

Interestingly, in the 1800's Jules Antoine Lissajous also projected
these images, using light projected to mirrors on vibrating objects
(like tuning forks, projected to a screen to study beat frequencies.
Was this the first sound/light show?
bret


 

_________________________________________________________
DO YOU YAHOO!?
Get your free @yahoo.com address at http://mail.yahoo.com