変動騒音のうるささ : L_&lteq&gtの妥当性について

抄録

The annoyance of some fluctuaing noises with extreme temporal features was measured by means of the magnitude estimation method. The noises judged by the subjects examined were traffic noises simulated on the basis of the equally spaced vehicles model, convex type sounds, concave type sounds, increasing sounds, and decreasing sounds. The experimental results of the simulated traffic noise show that L_&lteq&gt is a better predictor of annoyance than L_&lt10&gt and L+σ. L_&lteq&gt, however, does not predict the ESL (Effective Sound Level) of the convex type sound. The increasing sound was judged to be more annoying than the decreasing sound when L_&lteq&gt of both sounds were equivalent. L_&lteq&gt does not predict ESL of the increasing or decreasing sound either. From the results obtained for the convex type sounds, increasing sounds, and decreasing sounds, it can be said that the equal energy hypothesis is not valid. Despite the invalidity of the equal energy hypothesis, L_&lteq&gt gives an approximate prediction of the annoyance value as a whole.