室内音響の主観評価による室内音響設計指標の検討

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This paper aims at seeking an acoustic index which can be correlated with the most important subjective quantity evaluations and architectural conditions and physical quantities by performing hearing tests of music through sound reproduction of a dummy head recording in actual auditoriums in order to examine acoustic design criteria of auditoriums. Thirteen multipurpose auditoriums were examined each containing 700 to 1500 seats, with a large variety of shapes and acoustic characteristics. The sound source was an non-directional speaker with a constant output power placed on the stage, emitting music (five types of instrumental and vocal music) recorded in an anechoic room, and the emitted music was recorded by means of a dummy head in the seats of audience. Measuring points were selected in common for all the halls examined, and included two points on the stage, one placed 1 m sideways off the central line with the sound source as the reference point, and others on the grid of 7 m intervals. The acoustic hearing tests were performed by means of a capacitor-type headphone. The following were the items of subjective evaluations; loudness, quantity of reverberation, spatial impression, quality of reverberation, brilliance, definition, proximity and preference that is an overall evaluation of these. Hearing tests were performed by pair comparison between the 13 halls at two representative points, and between 6 halls having various and acoustic characteristics at their respective 24 to 26 points. The results revealed a factor structure of the items of evaluation between the halls, in which the quality of reverberation and the spatial impression were indicted along the I-axis, while the definition and proximity were shown in reverse correlation with these along the I-axis. When a stage enclosure was installed, the brilliance can be shown along the I-axis, adding a qualitative factor to the I-axis (Fig. 3). The results of the multiple regression of the hall specifications in relation to the preference indicated that the preference can be explained to large extent in terms of hall width and volume (Eq. (1)). With regard to the quantity of reverberation good correlation was found in the initial sound decay index and reverberation time in the middle and high frequency ranges (Table 6). In the factor structure of the subjective quantities in the same hall, the larger the hall, the greater the effect of sound volume (II-axis) on the criteria of the preference and quality of reverberation(Fig. 5). There was good correlation between the initial sound decay index and the quantity of reververation in the relationships between the subjective and physical quantities (Table 7). The above-mentioned results have revealed that "Centre time" T_s, in particular among the initial sound decay indices, has the most stable correlation with the difference between the position in the same hall and that between different halls with regard to the quantity of reverberation.
社団法人日本音響学会の論文
1976-10-01

室内音響の主観評価による室内音響設計指標の検討

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