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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. Hearing range - Wikipedia

    en.wikipedia.org/wiki/Hearing_range

    The shape of a bird's head can also affect its hearing, such as owls, whose facial discs help direct sound toward their ears. The hearing range of birds is most sensitive between 1 kHz and 4 kHz, but their full range is roughly similar to human hearing, with higher or lower limits depending on the bird species. No kind of bird has been observed ...

  4. What Can Humans Hear? Exploring the World of Auditory ... - AOL

    www.aol.com/humans-hear-exploring-world-auditory...

    Key Takeaways: Human hearing spans from 20 Hz to 20,000 Hz. Hearing conversation in noise is challenging, especially when the noise has a similar frequency to human speech.

  5. Music and sleep - Wikipedia

    en.wikipedia.org/wiki/Music_and_sleep

    Persistent sleeping disturbances can lead to fatigue, irritability, and various health issues. Numerous studies have examined the positive impact of music on sleep quality. As early as 2000 B.C., lullabies were designed to aid infant sleep. For adults with sleep-related disorders, music serves as a useful intervention in reducing stress.

  6. High fidelity - Wikipedia

    en.wikipedia.org/wiki/High_fidelity

    The human hearing range, for healthy young persons, is 20 Hz to 20,000 Hz. [13] Most adults can't hear higher than 15,000 Hz. [ 11 ] CDs are capable of reproducing frequencies as low as 0 Hz and as high as 22,050 Hz, making them adequate for reproducing the frequency range that most humans can hear. [ 11 ]

  7. 8 white noise machines for better sleep - AOL

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

    Sleep experts say using a white noise machine can improve sleep. Here, editor-tested picks from Hatch, HoMedics, YogaSleep and more. 8 white noise machines for better sleep

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