Abstract
An examination is made of three sets of data pertaining to paired-comparison judgment tests of the perceived noisiness of, primarily, aircraft noise: (1) 17 studies for which perceived noise levels (PNLs) calculated from peak of maximum sound-pressure levels of 143 noises are available; (2) a field study for which effective perceived noise level (EPNL is equal to PNL integrated over the duration of a noise) as well as maximum and peak PNL of 18 different aircraft noises are available; and (3) a study for which PNL and EPNL of impulsive noise (sonic booms) and the noise of subsonic aircraft are available. From these data, it is concluded that: (1) the perceived noisiness of aircraft sounds can best be predicted by combining 13- or 1-oct-band sound-pressure levels below 355 Hz in certain ways (to account for the critical bandwidth of the ear) prior to the calculation of PNL or by the use of a sound-level meter with a frequency weighting herein designated as D2; (2) time-integrated measures of sound are significantly better predictors of judged perceived noisiness than are so-called max or peak sound measures; and (3) corrections should probably be applied to EPNL of (a) nonimpulsive sounds of different onset duration and of (b) impulsive sounds whose level increases more than 40 dB in 0.5 sec. [Work supported by NASA.]
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