[sdiy] Various colors of noise.

[Emily Straight]

is there any statistical difference between different colors of noise after
going through a sample-and-hold? i'd figured on longer timescales every
possible voltage is equally likely anyway, so you wouldn't be able to tell
the difference.

On Mon, Mar 2, 2026, 3:26 PM Thomas Hudson via Synth-diy <
synth-diy at synth-diy.org> 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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