| level in decibels of the time integral of the antilogarithm of one-tenth of the tone-corrected perceived noise level, over the duration of an aircraft flyover; the reference duration is 10 s
NOTE 1 – The integral is usually approximated by one-half the summation, over the top ten decibels of an aircraft flyover, of the antilogarithms of one-tenth of the tone-corrected perceived noise level in successive 0,5 s intervals.
NOTE 2 – Effective perceived noise level purports to represent subjective noisiness.
NOTE 3 – Effective perceived noise level of an aircraft flyover tends to be 2 dB or 3 dB greater than A-weighted sound exposure level.
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