不規則変動音のやかましさ

抄録

Three series of psycho-acoustical experiments are performed to investigate how to evaluate the noisiness of randomly fluctuating sound. In these experiments, two hundreds and sixteen fluctuating pink noises, which have the same level pattern as various kinds of actual sounds or the artificially generated patterns, are used as stimuli and six to twenty four subjects judge the perceived noisiness by means of the magnitude estimation or the rating scale method or the constant method. The experimental results show that the noisiness of most fluctuating sounds is increased more than that of steady sound with the same acoustic energy by the level fluctuation, so the relation between PSE of the stimuli and some noise indices is investigated. The results of regression analysis show that L_<eq>, L^^^-+σ, L_<10>, ESL have a comparative good agreement with PSE and the model accounting for the level-fluctuating width or the level-fluctuating speed can predict the noisiness more accurately.