ダミーヘッド構築のための正中面の音像定位における身体的特徴量とHRTFの関係

摘要

In this paper, we consider the relationships between anthropometric parameters and HRTFs of the sound image localization in the median plane for the purpose of construction of general-purpose dummy head. In general, it has been pointed out that accuracy of the sound image localization using HRTFs of a dummy head is lower than that of a real head in the median plane. It is well known that the characteristics of HRTF depend on the pinna shape in particular in the median plane, and there are great differences between individuals. Therefore, construction of general-purpose dummy head which has higher vertical localized accuracy is expected. Then, we measured anthropometric parameters and HRTFs of real heads and three kinds of commercially available dummy head. Furthermore, we tried to compare and classify measured anthropometric parameters and HRTFs, and correlate between them by use of statistical analysis. As a result, we found out effective anthropometric parameters related to characteristics of HRTF.%本研究は，汎用ダミーヘッドの構築を目的として，身体的特徴量と正中面のHRTFとの関係について検討している．一般に，正中面の音像定位では，実頭のHRTFを用いた音像に比べてダミーヘッドのHRTFによる音像定位精度が悪いことが指摘され，特に正中面のHRTFは耳介形状に依存し，個人性があることが知られている．そのため，正中面の良好な音像定位が可能な汎用ダミーヘッドの構築が期待されている．そこで，被験者および市販の3種のダミーヘッドの身体的特徴量とHRTFを測定し，特徴量の比較，HRTFの分類，統計分析による身体的特徴量とHRTFとの関連付けを行い，HRTFに影響を与えやすい身体的特徴量を見出した．