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  2. Noise curve - Wikipedia

    en.wikipedia.org/wiki/Noise_curve

    Noise curves are a common way to characterise background noise in unoccupied buildings and spaces. [1] Their purpose is to produce a single-value representation of a complete sound spectrum. International standards organizations ( ISO , [ 2 ] ANSI [ 3 ] and ASA ) recognize the need to objectify judgements on the amount of ambient noise in ...

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

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

    If you want to give white noise a try, Dr. Maddox recommends keeping it at a low decibel level and not blasting it all day, as playing white noise at high decibels can cause long-term issues with ...

  4. Day-night average sound level - Wikipedia

    en.wikipedia.org/wiki/Day-Night_Average_Sound_Level

    The day-night average sound level (Ldn or DNL) is the average noise level over a 24-hour period. The noise level measurements between the hours of 22:00 and 07:00 are artificially increased by 10 dB before averaging. This noise is weighted to take into account the decrease in community background noise of 10 dB during this period.

  5. Audiogram - Wikipedia

    en.wikipedia.org/wiki/Audiogram

    Audiogram. An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer.The Y axis represents intensity measured in decibels (dB) and the X axis represents frequency measured in hertz (Hz). [1]

  6. Hearing range - Wikipedia

    en.wikipedia.org/wiki/Hearing_range

    When the subject hears the sound, they indicate this by raising a hand or pressing a button. The lowest intensity they can hear is recorded. The test varies for children; their response to the sound can be indicated by a turn of the head or by using a toy. The child learns what to do upon hearing the sound, such as placing a toy man in a boat.

  7. 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.

  8. 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]

  9. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!