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  2. 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 ...

  3. 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 ...

  4. List of Bose headphones - Wikipedia

    en.wikipedia.org/wiki/List_of_Bose_headphones

    The QC20 model is for Android, Windows and Blackberry devices, while the QC20i is designed for Apple devices and includes volume controls on the remote. [22] The noise cancelling hardware and micro-USB supported rechargeable battery is contained with a box located near the headphone jack, similar to the QuietComfort 1. The earbuds are similar ...

  5. Bose noise cancelling now available for cars without Bose ...

    www.autoblog.com/2013/12/22/bose-noise...

    Through an engineering collaboration with NXP, vehicles without Bose® speakers and amplifiers can now use Bose Active Sound Management technology to cancel unwanted engine and powertrain noise in ...

  6. 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 ...

  7. 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 ...

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