AW: What are you doing with noise?

[Haible_Juergen#Tel2743]

> What really wierd stuff is being done with noise out here?

Well, the weirdest thing I have done is giving my analogue sequencer
a random feature.
It goes like this:

Modulate a VCO, that's running in some upper frequency range,
with a certain amount of white noise.
Take your clock source and trigger AD envelope generator
with it to ges some short trigger pulses.
These trigger pulses go to one input of an AND gate, and the
Pulse output of the noise-modulated VCO goes to the other
input of the AND gate. Now clock the sequencer from the AND
gate's output!
Every time when a new clock slope approaches, the AD envelope
(shold be in the ms range!) gates the VCO and makes a random
amount of pulses to step thru the sequencer.

Try it, it's nice - you can even set the degree of "randomness"
by the noise level and the initial VCO frequency!

BTW, another nice thing is what I have seen in a BUCHLA
"source of incertainty" (sp?). Buchla uses prefiltered noise and
feeds it int  a 1st-order PLL before it is used for S&H stuff !!!
Very weird!

JH.