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Learn about the minimum sound level of a pure tone that an average human ear can hear with no other sound present. Find out the frequency-dependent threshold, the psychophysical methods for measuring it, and the factors that affect it.
Pure-tone audiometry is the main hearing test used to identify hearing threshold levels of an individual. It uses frequency specific pure tones to measure audibility thresholds, and can determine the degree, type and configuration of a hearing loss.
The EAR 59 class is a class of oil-fired 1,000 mm (3 ft 3 + 3 ⁄ 8 in) gauge 4-8-2+2-8-4 Garratt-type articulated steam locomotives. The 34 members of the class were built by Beyer, Peacock and Company in Manchester, England, for the East African Railways (EAR). They entered service in 1955–56, and were the largest, heaviest and most ...
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.
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). Learn how audiograms are produced, what normal and abnormal hearing thresholds are, and how they can help diagnose different types of hearing loss.
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.
AOL Mail offers secure and personalized email with features like AOL Mail, news, and weather for free. You can also access your email on the go with an iOS & Android app and get help from experts.
Real ear measurement is the measurement of sound pressure level in a patient's ear canal with a hearing aid. It is used to verify the performance of hearing aids and to adjust the amplification according to the patient's hearing loss.