Okano T, Beranek L L, Hidaka T
Takenaka Research and Development Institute, Chiba, Japan.
J Acoust Soc Am. 1998 Jul;104(1):255-65. doi: 10.1121/1.423955.
Relations are determined between one of the important subjective attributes of concert hall acoustics, the apparent source width, ASW, and three acoustical measures, interaural cross-correlation coefficient IACCE, LFE, and strength factor G. Although these measures previously have been found to correlate with ASW, their relations with it have not been examined sufficiently, especially in respect to their frequency characteristics. Herein, ASW's are directly determined for electronically reproduced musical sound fields with extensive ranges of values for IACCE and LFE. Investigated as parameters are angles of incidence, the time delay difference between a pair of symmetric early lateral reflections, and the number of early lateral reflections. These studies indicate the relative efficacy of IACCE and LFE for determining ASW under conditions that are realistically encountered in concert halls. The results were compared with measured IACCE's, LFE's, and also the strength factor G's in existing concert halls. It is concluded that the arithmetic average of [1-IACCE]'s at 500, 1 k and 2 k Hz combined with the strength factor Glow of the sound field at frequencies below 250 Hz are physical measures highly correlated with the subjective rank ordering of concert halls and that they cover the effects on ASW of the entire octave-band frequency range from 125 to 4 k Hz.
音乐厅声学的重要主观属性之一——表观声源宽度（ASW），与三种声学量度，即双耳互相关系数（IACCE）、低频增强（LFE）和强度因子（G）之间的关系得以确定。尽管此前已发现这些量度与ASW相关，但其与ASW的关系尚未得到充分研究，尤其是在频率特性方面。在此，针对具有广泛IACCE和LFE值范围的电子再现音乐声场，直接测定了ASW。作为参数进行研究的有入射角、一对对称早期侧向反射之间的时间延迟差以及早期侧向反射的数量。这些研究表明了IACCE和LFE在音乐厅实际遇到的条件下确定ASW的相对效能。将结果与现有音乐厅中测量得到的IACCE、LFE以及强度因子G进行了比较。得出的结论是，500Hz、1kHz和2kHz处[1 - IACCE]的算术平均值，与250Hz以下频率处声场的强度因子Glow相结合，是与音乐厅主观排名高度相关的物理量度，并且它们涵盖了从125Hz到4kHz的整个倍频程频段对ASW的影响。
