Abstract
The subjective response of humans to jet noises was studied to determine the relative difference in subjective annoyance levels produced by different jet engine configurations. The noises studied were representative of jet airplane ground and fly-over operations. Further testing was carried out to determine the relative annoyance properties of random noise spectra which were characterized by the presence of outstanding single frequency tones. Emphasis was placed on discovery of the relationships between “spike” frequency, “spike” amplitude, and over-all sound pressure level. The results of this program are presented with comments on their use as a basis for more extensive programs of this nature.
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