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An equal-loudness contour is a measure of sound pressure level for which a listener perceives a constant loudness. The human ear is most sensitive between 2 and 5 kHz, and the ISO standard curves reflect this and other factors.
Minimum audibility curve is a standardized graph of the threshold of hearing frequency for an average human, and is used as the reference level when measuring hearing loss with an audiometer as shown on an audiogram.
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The human hearing range is commonly given as 20 to 20,000 Hz, but varies with age and individual. Some animals, such as dolphins, bats, elephants and whales, can hear much higher or lower frequencies than humans.
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Hearing loss can be categorized as mild (25 to 40 dB), moderate (41 to 55 dB), moderate-severe (56 to 70 dB), severe (71 to 90 dB), or profound (greater than 90 dB). [2] There are three main types of hearing loss: conductive hearing loss , sensorineural hearing loss , and mixed hearing loss.
[3] [10] Although specific regulations vary across the world, most workplace best practices consider 85 decibels (dB A-weighted) averaged over eight hours per day as the highest safe exposure level for a 40-year lifetime. Using an exchange rate, typically 3 dB, allowable listening time is halved as the sound level increases by the selected rate.
Loudness is the subjective perception of sound pressure, which depends on frequency, level and duration of a sound. Learn about the physical, physiological and psychological components of loudness, and the different standards and methods for measuring and normalizing it.
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