Notes
March 6, 1992 letter from acoustician James D. Chalupník (Seattle, WA) to attorney Richard Aramburu discussing the appropriateness of the Ldn (Day-Night Level) metric for rating aircraft noise around Sea-Tac Airport and the data inputs to the FAA’s Integrated Noise Model (INM). Covers noise metrics including dBA, A-weighting, B-weighting, C-weighting, Fletcher-Munsen equal loudness curves, Stevens’ Loudness Level (Ll), Perceived Noise Level (PNL/Lpn), decibel logarithmic scale, frequency distribution, sound intensity, and psychoacoustics as applied to SEA-TAC Aircraft Noise Study 2. References Chalupník’s book ‘Evaluating the Noises of Transportation’ (University of Washington Press, 1969).