The evaluation of human response to the noise with different frequency distributions.

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  • 種々の周波数分布を持った衝撃騒音に対する人間感覚の評価
  • シュシュ ノ シュウハスウ ブンプ オ モッタ ショウゲキ ソウオン ニ タイ

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Abstract

We measured the physiological responses and the unpleasant feeling of 8 men under 6 kinds of impact noise (75 dB at subjects' ears) with different frequency distributions. The α,β and θ-activity of Electroencephalograms (EEG), and the increasing rate and the coefficient of variation of R-R interval time (CV-RR) of heart rate were used to monitor the subject's physiological responses to 6 different noise distributions. As the results, the subjects' unpleasant feeling tended to increase with the noise with higher frequency distributions. The degree of the subjects' unpleasant feelings judged by 20 pairs of adjectives to 6 different noise distributions, comparing one basic noise, were analyzed by the SD method, and 5 factors (moderate, stable, heavy, rapid and qualitative feeling) were selected. Then, the subjects' unpleasant feelings were evaluated by the additivity-measure of the AHP method and 2 fuzzy measures (possibility and necessity measure) using the Choquet integral to the results obtained from the AHP method. It showed that the unpleasant feeling tended to increase with the noise with a higher frequency distribution. It was found that subjects tended to decrease the unpleasant feeling to the noise with a higher frequency distribution as "heavy and rapid" noise by possibility-measure, and to increase one as "moderate, stable and qualitative" noise by necessity-measure. Thus, it was found that both methods of evaluation by physiological responses (i.e., EEG and heart rate), and analysis of the sensory test by the AHP method and 2 fuzzy measures using the Choquet integral gave the same results, and that it was possible to obtain a detailed evaluation of human response to the noise using 2 fuzzy measures.

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