4.57 reference equivalent threshold sound pressure level. At a specified frequency, the mean value of the equivalent threshold sound pressure levels of a sufficiently large number of ears of otologically normal persons of both sexes aged between 18 and 30 years...
4.56 reference equivalent threshold force level. At a specified frequency, the mean value of the equivalent force levels, in decibels relative to 1 μN derived from a sufficiently large number of ears of otologically normal persons of both sexes aged between 18 and 30...
4.55 reference equivalent speech recognition threshold level. For a specified speech signal, type of transducer, and method of signal presentation, mean value of the speech recognition threshold levels of a sufficiently large number of otologically normal persons of...
4.54 pure-tone average threshold level. Arithmetic average of hearing levels for the frequencies of 500, 1000, and 2000 Hz.
4.53 presbycusis; age-associated hearing loss. Loss of hearing sensitivity that results from physiological changes that occur with advanced...
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