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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. Noise-cancelling headphones - Wikipedia

    en.wikipedia.org/wiki/Noise-cancelling_headphones

    Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...

  4. 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 ...

  5. White noise machine - Wikipedia

    en.wikipedia.org/wiki/White_noise_machine

    A clock radio that includes a 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 ...

  6. Trouble sleeping? Save 20% on this superb white-noise machine

    www.aol.com/lifestyle/trouble-sleeping-save-20...

    For as little as $18, you can put a portable, versatile sound machine by your bedside. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 ...

  7. Your brain is noise-cancelling - AOL

    www.aol.com/news/brain-noise-cancelling...

    When you're shopping for a new pair of headphones one of the best features to have is noise-cancelling technology. Drowning out the random noises around you lets you really sink into the music, or ...

  8. Health effects from noise - Wikipedia

    en.wikipedia.org/wiki/Health_effects_from_noise

    Elevated workplace or environmental noise can cause hearing impairment, tinnitus, hypertension, ischemic heart disease, annoyance, and sleep disturbance. [3] [4] Changes in the immune system and birth defects have been also attributed to noise exposure. [5] Although age-related health effects ( presbycusis) occur naturally with age, [6] in many ...

  9. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound. Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the open air for anyone nearby ...

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