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橋梁振動による低周波複合音に対する人間の知覚臨界帯域特性に関する研究

桥梁振动引起的低频复杂声音的人体感知临界频带特性研究

基本信息

批准号：
15760343
负责人：
松本泰尚
金额：
$ 2.24万
依托单位：
Saitama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

本研究では,橋梁振動に起因する低周波音など,生活環境で問題となる大半の低周波音が複合音であることに着目し,低周波複合音に対する人間の知覚特性に関する検討を行った.実験室内で行った被験者を用いた官能実験では,1)知覚閾値を上回る低周波領域の音の存在が低周波純音の知覚閾値に与える影響(マスキング効果)及び,2)知覚閾値を下回る低周波領域の音の存在が低周波純音の知覚閾値に与える影響(複合音の知覚)について検討した.1)においては,暗騒音下及び60〜100Hzで大きさの異なる2種類の帯域雑音下で,20〜50Hzの純音の知覚閾値を測定した.その結果,帯域雑音下における知覚閾値は暗騒音下における知覚閾値より高くなることが分かり,本実験で用いた周波数の純音に関して,その差は周波数に依らずほぼ等しい値となった.2)においては,暗騒音を低減するために構築した実験室内において,知覚閾値より5dB及び10dB低い音圧レベルの25Hzの音と31.5〜50Hzの音を組み合わせた複合音の知覚閾値を測定した.その結果,31.5Hzと25Hzを組み合わせた複合音の場合,複合音の知覚閾値での31.5Hzの音圧レベルが,純音の知覚閾値より低くなることが分かった.今後,異なる条件での知見を蓄積していくことにより,低周波音に対する人間の知覚臨界帯域の特性が解明できると考えられる.また,既往の研究で提案されているラウドネスモデルを改良し,マスキング効果を考慮した知覚閾値の予測を可能とするモデルを構築することを試み,ある程度の精度で上記の実験結果と一致するモデルを構築することができた.今後,様々な実験室及び現地での実験データを用いて,本モデルの妥当性をさらに検討することが必要である.

This paper discusses the causes of bridge vibration, the living environment and most of the problems related to low frequency complex sound, low frequency complex sound and human knowledge characteristics. 1) The threshold value of low frequency pure tone is affected by the presence of low frequency tone in the low frequency domain, 2) The threshold value of low frequency pure tone is affected by the presence of low frequency tone in the low frequency domain, 3) The threshold value of low frequency pure tone is affected by the presence of low frequency tone in the low frequency domain, 4) The threshold value of low frequency pure tone is affected by the presence of low frequency tone in the low frequency domain, 5) The threshold value of low frequency pure tone is affected by the presence of low frequency tone in the low frequency domain, 6) The threshold value of low frequency pure tone is affected by the presence of low frequency tone in the low frequency domain, 7) The threshold value of low frequency pure tone is affected by the presence of low frequency tone in the low frequency domain, 7) The threshold value of low frequency pure tone is affected by the presence of low frequency pure tone in the low frequency domain, 7) The threshold value of low frequency pure tone is affected by the presence of low frequency pure tone in the low frequency domain, 7) The threshold value of low frequency pure tone is affected by the presence of low frequency pure tone in the low 2 kinds of band tones under dark tones and 60~100 Hz, 20~50 Hz and pure tones. As a result, the threshold value of the band tone is lower than that of the dark tone, and the threshold value of the dark tone is lower than that of the dark tone. In this case, the pure tone of the middle frequency is used, and the difference between the pure tone of the middle frequency and the pure tone of the middle frequency is used. In the middle frequency, the dark tone is lower than that of the low frequency. In the middle frequency, the dark tone is lower than that of the low frequency. The threshold values of the low and middle tones of 25 Hz and 31.5~50 Hz were measured. As a result, 31.5Hz and 25Hz are combined to form a compound tone, the threshold value of compound tone is 31.5Hz and the threshold value of pure tone is low. In the future, knowledge accumulation under different conditions will lead to the understanding of the characteristics of critical zones in human beings at low frequencies. In the past, research proposals were made to improve the accuracy of the results, to consider the prediction of the threshold value, to try the accuracy of the results and to construct the results. In the future, it is necessary to investigate the appropriateness of this project in the light of the actual situation in the laboratory and in the field.