自動車内車音・車外音に関する音質アプローチ : 周波数に関連した属性と衝撃感の定量化

概要

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In case of vehicle noise, there exist two subjective feelings that have not been well quantified yet by utilizing existing psychoacoustcal parameters. Those are booming sensation due to the presence of prominent low frequency interior noise and impulsiveness of the exterior noise at idle due to the knocking phenomenon from a diesel powerplant. For booming sensation, it is successfully quantified in our laboratory by utilizing the subjective response to booming sensation as the weighting function to the sensation level in case of stationary noise, i. e, interior noise at cruising mode. In order to extend this measure for applying this concept to non-stationary noise, i. e, acceleration noise, a new psychoacoustical measure named booming index was developed here. For the development of a measure representing impulsiveness of diesel exterior noise, exterior noise at idle is evaluated and the relation between the subjective result and the newly peoposed measure named IMPULSE is discussed. This newly proposed measure is calculated with the average sound pressure that exceeds the root mean square value of the time waveform of the sound pressure.
社団法人日本音響学会の論文