Acoustical measurements and individual subjective evaluations for sound fields were performed based on a model of the human auditory-brain system and subjective preference theory. In the acoustic measurement section, orthogonal factors in historical opera houses and outdoor sound fields in forests are discussed. In the subjective evaluation section, individual differences and intra-individual changes of subjective preference are described in terms of the orthogonal factors. The main conclusions are as follows: (1) In acoustic measurements in a forest and in a bamboo forest, it is found that multiple scattering effects between trees or bamboo improve IACC; (2) Results of a preference test in an existing opera house show that subjective preference theory can be applied to opera houses, including the orchestra pit and the box seats; (3) Coefficient is introduced for individual preference in a sound field; and (4) The investigations of preference tests in relation to listening level (LL) and subsequent reverberation time (T_sub) for a simulated sound field show that subjects with a large value of α have small intra-individual changes, so the range of its preferred value is small. On the other hand, subjects with small value have minor preference as its parameter is changed. Thesis advisor: Yoichi Ando Copies of this thesis written in English can be obtained from Hiroyuki Sakai, Graduate School of Science and Technology, Kobe University, Rokkodai, Nada, Kobe 657-8501 Japan. E-mail address: sakaih@kobe-u.ac.jp.

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   |texte=   Acoustic measurements and the individual subjective evaluation for sound fields
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