11.21 hearing threshold; threshold of audibility. For a given listener and specified signal, the minimum (a) sound pressure level or (b) force level that is capable of evoking an auditory sensation in a specified proportion of trials. Sound reaching the...
11.20 air-bone gap. For the ear of an individual at a specified frequency, the difference between the hearing threshold levels for air conduction and bone conduction. Unit, decibel...
11.19 bone conduction. Transmission of sound to the inner ear primarily by means of mechanical vibration of the cranial...
11.18 air conduction. Transmission of sound through the outer and middle ear to the inner...
11.17 effective perceived noise level. Level of the time integral of the antilogarithm of one-tenth of tone-corrected perceived noise level over the duration of an aircraft flyover, the reference duration being 10 s. Unit, decibel (dB); abbreviation, EPNL;...
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