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2. Doctors Say This Type Of Noise Is Best For Deep Sleep - AOL

   www.aol.com/doctors-type-noise-best-deep...

   The big three in sleep sounds are white noise, brown noise, and pink noise, but there are many other noise types, including purple noise, gray noise, and even black noise (a.k.a. good ol ...

3. Colors of noise - Wikipedia

   en.wikipedia.org/wiki/Colors_of_noise

   Noise that has a frequency spectrum of predominantly zero power level over all frequencies except for a few narrow bands or spikes. Note: An example of black noise in a facsimile transmission system is the spectrum that might be obtained when scanning a black area in which there are a few random white spots. Thus, in the time domain, a few ...

4. Grey noise - Wikipedia

   en.wikipedia.org/wiki/Grey_noise

   Grey noise spectrum The result is that grey noise contains all frequencies with equal loudness , as opposed to white noise , which contains all frequencies with equal energy . The difference between the two is the result of psychoacoustics , more specifically the fact that the human hearing is more sensitive to some frequencies than others.

5. Health effects from noise - Wikipedia

   en.wikipedia.org/wiki/Health_effects_from_noise

   Annoyance effects of noise are minimally affected by demographics, but fear of the noise source and sensitivity to noise both strongly affect the 'annoyance' of a noise. [42] Sound levels as low as 40 dB(A) can generate noise complaints [43] and the lower threshold for noise producing sleep disturbance is 45 dB(A) or lower. [44]

6. 8 white noise machines for better sleep - AOL

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

   HoMedic’s alarm clock offers eight relaxation and nature sounds— including a white, pink, gray and brown noise option. The “sleep therapy” options play your favorite nature sound for 15 or ...

7. How to fight noise with white noise for a better night's ...

   www.aol.com/fight-noise-white-noise-better...

   Sometimes the only way to combat noise is with more noise. "White noise," "brown noise" and "pink noise" can help you mask unwelcome sounds