---
type: Fractal Concept
title: Pink Noise
description: Random signal whose power spectral density is inversely proportional to frequency; a 1D fractal noise widely observed in natural systems.
resource: https://tyson-swetnam.github.io/fractal-notebooks/okf/concepts/stochastic/pink-noise/
tags:
- stochastic
- signal-processing
aliases:
- 1/f noise
- flicker noise
sources:
- id: glossary
  resource: https://tyson-swetnam.github.io/fractal-notebooks/foundations/glossary/
  title: Fractal Notebooks glossary (Chapter 4)
- id: seed
  resource: https://github.com/tyson-swetnam/fractal-notebooks/blob/main/fractal_rag/src/fractal_rag/concepts/seed.yaml
  title: fractal_rag concept seed (seed.yaml)
generated:
  by: process:fractal-rag-okf-export
  at: "2026-10-24T00:00:00Z"
status: stable
---

# Definition

Random signal whose power spectral density is inversely proportional to frequency; a 1D fractal noise widely observed in natural systems.

# Aliases

`1/f noise`, `flicker noise`

# Related concepts

* [Fractal](../geometry/fractal.md)

# Citations

[1] [Fractal Notebooks glossary (Chapter 4)](https://tyson-swetnam.github.io/fractal-notebooks/foundations/glossary/) — `docs/foundations/glossary.md`

[2] [fractal_rag concept seed (seed.yaml)](https://github.com/tyson-swetnam/fractal-notebooks/blob/main/fractal_rag/src/fractal_rag/concepts/seed.yaml) — `fractal_rag/src/fractal_rag/concepts/seed.yaml`