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aircraft velocity aircraft-flyover noise analysis of variance annoyance caused Annoying Extremely Annoying band level caused by aircraft-flyover common slopes content with level correlation coefficients CTOL dB per doubling decibels per doubling Doppler shift term doubling of effective duration and velocity duration with level effect of Doppler effective duration effects of duration effects of tonal EPNL experiment Extremely Annoying Extremely factorial combinations Federal Aviation Administration figure graphical scale group of stimuli hypothesis of common indicates significant interaction of tonal IPL1 IPL2 IPNL IPNLT Langley Research Center Mean annoyance rating Mean band NASA noise stimuli null hypothesis numerical category scaling perceived noise level predict annoyance ranked rating scales regression analyses scoring sheets session significant at 0.01 significantly sound pressure level spectra stimuli with tones stimuli without tones Strong tones subgroup of stimuli synthesized test conductor test facility test subjects tion tonal content tone conditions V/STOL