Brown noise
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Sounds generated by your device: nothing is downloaded. On iPhone and some Android phones, the sound stops when the screen locks.
Brown noise is a deep, muffled noise in which low frequencies dominate, like a distant waterfall.
Its level drops by 6 decibels per octave. Its name comes from Brownian motion, studied by the botanist Robert Brown, not from the colour.
| Noise | Spectrum | What it sounds like |
|---|---|---|
| White noise | Equal energy at every frequency | A bright hiss, like a radio between stations |
| Pink noise | −3 dB per octave: equal energy in each octave | Softer, like steady rain |
| Brown noise | −6 dB per octave: low frequencies dominate | Deep and muffled, like a distant waterfall |
Frequently asked questions
What is brown noise?
A noise whose energy decreases sharply with frequency: much more bass than treble. It is also called red noise.
Why is brown noise popular for focus?
Its deep, steady sound covers background noise without the hiss of white noise; many people find it easier to forget.
How loud should it be?
Just loud enough to cover the noise around you. Keep a moderate volume, especially with headphones or near a sleeping baby, and place the device at a distance.