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Understanding Brown Noise: Frequency Range and Benefits

Mar 20, 2024

What is Brown Noise?

Brown noise, also known as Brownian noise or red noise, stands out among various colored noise types for its deeper tone and strong correlation with natural phenomena. It has a direct linkage to random particle motion, or Brownian motion, from which its name is derived. Unlike white or pink noise, brown noise produces a power density that decreases with increasing frequency, offering a richer, bass-heavy sound experience.

Frequency Range of Brown Noise

Defining brown noise by a precise frequency range can be challenging, as it emphasizes lower frequencies with an intensity that diminishes as the frequency increases. The energy of brown noise drops by 6 decibels per octave as we move up the frequency scale, resulting in a spectrum that is heavily weighted towards the lower end.

However, brown noise generally resides within the audible spectrum of human hearing, ranging from approximately 20 Hertz (Hz) to 20,000 Hz, the standard range of human hearing. Its distinct characteristic of increased energy at lower frequencies implies that it contains deeper tones usually under 500 Hz, making it preferable for sound masking and facilitating a calming environment.

Benefits and Applications of Brown Noise

Brown noise has found its application in various fields. By providing a steady, consistent auditory backdrop, it can aid in relaxation and concentration. It's often employed as a sleep aid, for sound therapy, and in sound masking as its lower frequencies are particularly effective at drowning out distractions.


While brown noise includes a broad spectrum of frequencies within human hearing, it is its dominance in lower frequencies that sets it apart, offering a unique auditory experience that can be beneficial for relaxation, concentration, and sleep enhancement.

If you're interested in experiencing brown noise or incorporating it into your daily routine, extensive resources are available to help you explore its potential benefits and applications.

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