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  2. 8 white noise machines for better sleep - AOL

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

    This simple white noise machine offers ten fan sounds and ten ambient noise variations (including white, pink and brown noise). It is powered by either AC or USB and you can adjust the volume with ...

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

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

    In a 2021 review of 38 studies on the relationship between white noise and sleep, researchers concluded that the quality of the evidence to support white noise as a sleep aid was poor and more ...

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

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

    Brown noise: a relaxing rumble. Literally on another side of the spectrum from white noise lies brown noise (also called red noise.) “Brown noise accentuates lower frequencies, has a deeper ...

  5. 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, 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 higher frequencies, or ...

  6. Active noise control - Wikipedia

    en.wikipedia.org/wiki/Active_noise_control

    Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...

  7. Colors of noise - Wikipedia

    en.wikipedia.org/wiki/Colors_of_noise

    White. Pink. Red (Brownian) Purple. Grey. v. t. e. In audio engineering, electronics, physics, and many other fields, the color of noise or noise spectrum refers to the power spectrum of a noise signal (a signal produced by a stochastic process ).

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