Editing Brownian noise (section)

{{Short description|Type of noise produced by Brownian motion}}
{{Redirect|Brown noise|the hypothetical sound that affects the human bowel|Brown note|other uses}}
{{Listen|filename=Brownnoise.ogg|title=Brown noise|description=10 seconds of Brownian noise|pos=right}}
[[File:Red-noise-trace.svg|thumb|Sample trace of Brownian noise]]
{{Colors of noise}}

In [[science]], '''Brownian noise''', also known as '''Brown noise''' or '''red noise''', is the type of [[signal noise]] produced by [[Brownian motion]], hence its alternative name of '''[[random walk]] noise'''. The term "Brown noise" does not come from [[brown|the color]], but after [[Robert Brown (Scottish botanist from Montrose)|Robert Brown]], who documented the erratic motion for multiple types of inanimate particles in water.  The term "red noise" comes from the "white noise"/"white light" analogy; red noise is strong in longer wavelengths, similar to the red end of the [[visible spectrum]].