Auditory evaluation of very-high-frequency sounds radiated from the Japanese trains

摘要

The purpose of this research is to clarify the state of hearing high frequency sound and to ensure safety and consideration for young people including children. In this study, we measured the hearing threshold of high frequency pure tone for 4 college students aged 21 to 24 and high frequency sound in the train together with conducting demonstration experiment and auditory sensation. From the measurement results of the high frequency pure tone audible range, we could confirm everyone in the 4 people was able to list up to 16 kHz and 3 out of 4 people were able to listen up to 22 kHz although there were individual differences in the threshold value. Moreover, during the demonstration experiment and the auditory experiment in the train we could confirm that some people feel uncomfortable after hearing the high frequency sound. This time there were four participants in the experiment, but this number was sufficient to clarify the exposure condition of high frequency sound and its influence became clear in everyday life.