THE EFFECTS OF TEMPORAL AND SPECTRAL COMBINATIONS ON THE JUDGED NOISINESS OF AIRCRAFT SOUNDS
BOLT BERANEK AND NEWMAN INC VAN NUYS CA
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Tests were performed in an anechoic chamber using college students to determine the judged noisiness of stimuli varying both temporally and spectrally. The investigations were divided into three test series. The first test series used thirty stimuli with six different time patterns and five different spectra. The second test used stimuli selected from the first test but modified to include signal durations ranging from 1 to 100 seconds. Duration in this case is the amount of time the stimuli were within 10 dB of the maximum level. The stimuli for the third test consisted of recordings of turboprop, turbofan, turbojet and helicopter flyovers.