| Abstrakt: |
Recent experiments have been conducted investigating the effect of the duration of a sound on its judged noisiness. For these tests, duration is defined as the amount of time that the sound was within 10 dB of its maximum level. The tests were conducted using two different time patterns and three spectra including a simulated jet spectra, a 1000-Hz pure tone, and a 13-oct band of noise centered at 1000 Hz. The range of durations tested extended from 4 to 60 sec. The results are compared with those of earlier tests, which were conducted over a range from 112 to 12 sec. The current tests indicate that, for the longer durations, the relative effect on judged noisiness is not as great as that found for the shorter durations. [Work supported by the Aircraft Development Service. Federal Aviation Agency.] [ABSTRACT FROM AUTHOR] |
