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2. Colors of noise - Wikipedia

   en.wikipedia.org/wiki/Colors_of_noise

   Brownian noise, also called Brown noise, is noise with a power density which decreases 6.02 dB per octave (20 dB per decade) with increasing frequency (frequency density proportional to 1/f 2) over a frequency range excluding zero . It is also called "red noise", with pink being between red and white.

3. 8 white noise machines for better sleep - AOL

   www.aol.com/news/8-white-noise-machines-better...

   It is a compact model with ten fan sounds, ten white, pink and brown noise variations and two ocean sounds. The machine offers precise volume control, a timer to automatically turn off sounds and ...

4. White, brown and pink noise machines are going viral for ...

   www.aol.com/news/white-brown-pink-noise-machines...

   White, pink or brown noise can also be used with other relaxation techniques, such as deep breathing or meditation, Harris adds. Tips to get a better night's sleep.

5. Pink noise - Wikipedia

   en.wikipedia.org/wiki/Pink_noise

   Pink noise, 1 ⁄ f noise, fractional noise or fractal noise is a signal or process with a frequency spectrum such that the power spectral density (power per frequency interval) is inversely proportional to the frequency of the signal. In pink noise, each octave interval (halving or doubling in frequency) carries an equal amount of noise energy.

6. White noise machine - Wikipedia

   en.wikipedia.org/wiki/White_noise_machine

   A white noise machine is a device that produces a noise that calms the listener [citation needed], which in many cases sounds like a rushing waterfall or wind blowing through trees, and other serene or nature-like sounds. Often such devices do not produce actual white noise, which has a harsh sound, but pink noise, whose power rolls off at ...

7. How to Find Your Right Noise for the Best Sleep Ever - AOL

   www.aol.com/noise-best-sleep-ever-130000266.html

   Pink noise: the softest sound. Pink noise is the soft, gentle middle ground between the blanket of white noise and the deep, low tones of brown noise.