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2. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   Dual hearing protection refers to the use of earplugs under ear muffs. This type of hearing protection is particularly recommended for workers in the mining industry because they are exposed to extremely high noise levels, such as an 105 dBA TWA. [25] [26]} Fortunately, there is an option of adding electronic features to dual hearing protectors ...

3. Long-range acoustic device - Wikipedia

   en.wikipedia.org/wiki/Long-range_acoustic_device

   The human ear can typically stand a sound pressure level of 120 dB before feeling pain. AHDs are capable of 135 dB or more of acoustic energy. OSHA states that any sound pressure level over 90 dB requires hearing protection. [16] As volume increases so does the chance of hearing loss.

4. Safe listening - Wikipedia

   en.wikipedia.org/wiki/Safe_listening

   Using estimates from the International Organization for Standardization (ISO 1999:2013), [47] the authors calculated that 99% of children who are exposed from birth until the age of 18 years to 8-h average sound levels (LEX) of 82 dBA would have hearing thresholds of about 4.2 dB greater, indicating a shift in hearing ability. By including a 2 ...

5. Hearing protection fit-testing - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_fit-testing

   Hearing protector fit-testing is a method that measures the degree of noise reduction obtained from an individual wearing a particular hearing protection device (HPD) - for example, a noise canceling earplug or earmuff. Fit testing is necessary because noise attenuation varies across individuals.

6. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   Painful discomfort occurs at approximately 120 to 125 dB(A), [43] with some references claiming 133 dB(A) for the threshold of pain. [44] Active ear muffs are available with electronic noise cancellation that can reduce direct path ear canal noise by approximately 17–33 dB, depending on the low, medium, or high frequency at which attenuation ...

7. Impulse noise (acoustics) - Wikipedia

   en.wikipedia.org/wiki/Impulse_noise_(acoustics)

   The U.S. Department of Defense has established criteria for equipment that produces impulse noise at levels above 140 dB peak SPL and requires hearing protection be worn to prevent damage human ears. [4] An impulse noise filter can enhance the quality of noisy signals to achieve robustness in pattern recognition and adaptive control systems.