[sdiy] probably a simple analog patch question

[Jeff Brown]

1) Any filter that is resonant fed with noise with the filter resonance set
a bit below self-oscillation.
2) Resonant filter set to self-oscillate, frequncy modulated by noise.
2) A VCO frequency modulated with noise as you mentioned. 
3) Noise into a frequency shifter. 
4) VCO used to clock a Pseudo-random noise source (such as Ken Stone's).


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Gordon JC Pearce
Sent: Wednesday, February 02, 2011 2:58 AM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] probably a simple analog patch question

On Tue, 2011-02-01 at 16:40 -0800, nicolas wrote:
> Band filtered noise (with the filter Q up at the very nearly
> ocillating point) is a physical modelling approach to flute type
> sounds.  Probably you would need to control the Q with an ADSR so that
> it starts lower and then pushes over into oscillation after the
> initial chiff.
> 
> Cheers,
> Nicolas

For "chiptune"-type white noise, stuff some ordinary white noise through
a sample-and-hold clocked at audio rate.  It's not pitched so much but
you get that computer game noise growl thing as you sweep the clock rate
down to low audio.

Gordon MM0YEQ

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