A study on evaluation methods of combined traffic noises Part1: Response to road traffic and conventional railway noises in a laboratory

摘要

In Japan, methods for the evaluation of combined noises emitted by different sound sources are not yet established. Against such a background, psychological evaluation experiments using combined noises were conducted in a simulated environment laboratory. The combined noises were composed of road traffic and railway noises. There were two kinds of experiments, one without and one with listening disturbance: Experiment-A and Experiment-B, respectively. For Experiment-A, subjects assessed the combined noise while reading books or magazines. On the other hand, for Experiment-B, subjects assessed the combined noise while watching a movie on DVD. The following results were obtained. 1) For experiment-A there was no difference between road traffic noise and conventional railway noise in terms of annoyance. However, the annoyance response to railway noise was higher than that to road traffic noise in Experiment-B. 2) Experiment-A shows that conventional railway noise had a depression effect on the annoyance response to road traffic noise. In contrast, the results of Experiment-B showed a higher annoyance response to road traffic noise with the increase of conventional railway noise. 3) The annoyance evaluation of the combined noise was more strongly affected by road traffic noise than railway noise.