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  2. The Hum - Wikipedia

    en.wikipedia.org/wiki/The_Hum

    A 1973 report cites a university study of fifty cases of people complaining about a "low throbbing background noise" that others were unable to hear. The sound, always peaking between 30 and 40 Hz (hertz), was found to only be heard during cool weather with a light breeze, and often early in the morning. These noises were often confined to a 10 ...

  3. Day–evening–night noise level - Wikipedia

    en.wikipedia.org/wiki/Day–evening–night_noise...

    The day–evening–night noise level or L den is a 2002 European standard to express noise level over an entire day. It imposes a penalty on sound levels during evening and night [ 1 ] and it is primarily used for noise assessments of airports , busy main roads, main railway lines and in cities over 100,000 residents.

  4. Soundproofing - Wikipedia

    en.wikipedia.org/wiki/Soundproofing

    A pair of headphones being tested inside an anechoic chamber for soundproofing. Soundproofing is any means of impeding sound propagation.There are several methods employed including increasing the distance between the source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using ...

  5. 8 of the best noise-canceling headphones for blocking out the ...

    www.aol.com/news/9-best-noise-cancelling...

    BEST NOISE-CANCELING HEADPHONES DEALS THIS WEEK: * Cowin E7 Active Noise Cancelling Headphones -- $49.99 (save $10) * Bose QuietComfort 25 -- $147.18 (save $197.82) * Skullcandy Venue Active Noise ...

  6. Noise pollution - Wikipedia

    en.wikipedia.org/wiki/Noise_pollution

    Noise laws and ordinances vary widely among municipalities and indeed do not even exist in some cities. An ordinance may contain a general prohibition against making noise that is a nuisance, or it may set out specific guidelines for the level of noise allowable at certain times of the day and for certain activities. [118]

  7. Outsider house - Wikipedia

    en.wikipedia.org/wiki/Outsider_house

    Outsider house (originally spawned as outsider dance, [1] also known as raw house [2]) is a subgenre of house music, combining elements of deep house, techno, noise, and ambient, with artists embracing lo-fi techniques rather than the polished cleanliness of mainstream deep house and other EDM genres. [3] [4]

  8. Fix problems reading or receiving AOL Mail

    help.aol.com/articles/fix-problems-reading-or...

    Clear your browser's cache to reset your browser and wipe out all the little unwanted bits of info that have been stored, making it overall run better. Fix problems with missing emails When emails go missing in AOL Mail, it's often due to a few simple things; either the message is in the wrong folder, your third-party mail client's settings, or ...

  9. Precedence effect - Wikipedia

    en.wikipedia.org/wiki/Precedence_effect

    The precedence effect or law of the first wavefront is a binaural psychoacoustical effect concerning sound reflection and the perception of echoes.When two versions of the same sound presented are separated by a sufficiently short time delay (below the listener's echo threshold), listeners perceive a single auditory event; its perceived spatial location is dominated by the location of the ...