[sdiy] Various colors of noise.

[Mike Beauchamp]

Hi Thomas,
Maybe take all of the different noises, and feed them into an 
interpolating scanner circuit (like this one: 
https://till.com/articles/scanner/ ) and from there you could control 
the output noise colour (and anything inbetween) with the wandering CV.

I wonder if the different noise colours all need to be derived from a 
single source for the crossfading to work.

Mike


On 2026-03-02 18:20, Thomas Hudson via Synth-diy wrote:
> I have an analog module that can generate blue, white, pink, and red 
> (brownian) noise. I’m interested in how I might create a random walk 
> using perhaps a sample/hold and smoothing function to produce a sort of 
> wandering control voltage from each of these noise sources.
> 
> I also was recently introduced to green noise. From Wikipedia:
> 
>   * The mid-frequency component of white noise, used in halftone
>     <https://en.wikipedia.org/wiki/Halftone>dithering
>     <https://en.wikipedia.org/wiki/Dithering>^[19]
>     <https://en.wikipedia.org/wiki/Blue_noise#cite_note-19>
>   * Bounded Brownian noise
>   * Vocal spectrum noise used for testing audio circuits^[20]
>     <https://en.wikipedia.org/wiki/Blue_noise#cite_note-comp.dsp_FAQ-20>
>   * Joseph S. Wisniewski writes that "green noise" is marketed by
>     producers of ambient sound effects recordings as "the background
>     noise of the world". It simulates the spectra of natural settings,
>     without human-made noise. It is similar to pink noise, but has more
>     energy in the area of 500 Hz.
> 
> 
> Wondering how I might generate this other than using something like a 
> bandpass filter tuned to 500 Hz using pink noise. I want to generate it 
> in the analog realm.
> 
> TIA,
> Thomas
> 
> 
> 
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