Sound intensity response for the assessment of the room acoustic quality

本研究的最终目的是研究声强响应和声学主观响应之间的关系，并提出新的室内声学评价指标。本文首先讨论了接收点周围声强分布与主观定位之间的关系，并将两种可精确计算任意点声强分布的简单声场应用于主观定位评价，实验结果表明：1）当声强分布稳定时，即在接收点周围声强矢量的方向几乎相同，则利用该声强矢量可以以很高的概率进行定位，而当声强分布不稳定时，不能利用该声强矢量进行定位。2）当计算的声强分布稳定时，3）在声强分布复杂的接收点处，受试者不能容易地声明定位。4）在声强分布复杂的接收点处，强度矢量的方向与主观定位不对应，与声能流不对应。5）在声强分布复杂的接收点，受试者感觉到声音来自各个方向。6）上述发现表明，通过使声音强度分布复杂化，可以为受试者设计一个感觉舒适的房间。

The final goal of this research is to study the relation between the sound intensity response and the acoustic subjective response and to propose new indices for the assessment of room acoustics. In this report as the first stage relations between the sound intensity distribution around the receiving point and the subjective localization are discussed.Two kinds of simple sound field where the sound intensity distribution at any point can be calculated exactly are applied to subjective assessment of localization.The results obtained from the above experiments are follows,1) When the sound intensity distribution is stable, that is the direction of the sound intensity vector is almost same around the receiving point, then the localization can be estimated by means of the intensity vector at high probability and when the intensity distribution is unstable, the localization can not be estimated by the intensity vector.2) When calculated sound intensity distribution is stable, the measured one is also stable and the localization can be estimated easily.3) At a receiving point where the sound intensity distribution is complicated, the subjects can not declare the localization easily.4) At a receiving point where the sound intensity distribution is complicated, the direction of the intensity vector does not correspond to the subjective localization and does not correspond to the sound energy flow.5) At a receiving point where the sound intensity distribution is complicated, subjects feel for the sound to come from all directions.6) The above findings suggest that is possible to design a room for subjects to feel envelopment by making the sound intensity distribution complicate.