Abstract
Using the psychophysical method of constant stimuli, 36 subjects (18 males and 18 females) under two sets of instructions, made annoyance judgments for a total of 8496 pairs of recorded actual flyovers. Flyovers were selected on the basis of magnitude of tone element and 20 dB down duration. Fifteen different scaling units purporting to measure the relationship between physical acoustical properties and “annoyance” were applied to the various flyovers. Some of the scaling units applied were PNdB, PNdB with a tone correction, Effective PNL, Composite PNL, Stevens' phons, Stevens' phons with a pure tone correction, and so on. After applying each of the 15 different scaling approaches to the flyovers, each approach was related to the annoyance judgments obtained. Surprisingly, Stevens' phons with a pure tone correction predicted equal annoyance points better than any of the other 14 approaches. Possible application of the results to noise suppression devices for jet engines is also discussed.
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