FREQUENCY SPECTRUM AND TIME DURATION DESCRIPTIONS OF AIRCRAFT FLYOVER NOISE SIGNALS.
BOLT BERANEK AND NEWMAN INC VAN NUYS CALIF
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Thirty-two flyover noise recordings were analyzed and compared with respect to characteristics currently used to assess the noisiness of the flyover signal--maximum levels, duration, and presence of discrete frequency components. The recordings included takeoff and landing signals of most major types of commercial jet transport aircraft. Comparisons are made of the calculated perceived noise levels based on maximum octave and one-third octave band measurements and on one-third octave band noise levels measured at the time the N-weighted sound level reached a maximum. The time durations obtained from overall sound pressure level, calculated perceived noise level, N-weighted and A-weighted time histories are compared. Corrections to the calculated perceived noise levels for the presence of discrete frequency components as calculated by two procedures are also compared. Basic flyover noise signal characteristics and data reduction criteria, techniques and limitations are also discussed. Author