[sdiy] Various colors of noise.

[Thomas Hudson]

BTW, while researching creating green noise I came across a website for a Mac and iOS app:

https://simplynoise.com/

In addition to noise colors, t also has beach sounds, fireplaces, babbling brooks, etc.

Fun little app.


> On Mar 3, 2026, at 5:56 PM, Thomas Hudson via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> 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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