[sdiy] Various colors of noise.

[Thomas Hudson]

Interesting idea and article. 

> On Mar 3, 2026, at 4:58 PM, Mike Beauchamp <list at mikebeauchamp.com> wrote:
> 
> 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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