室内の響きに関する心理尺度と諸物理量の相関

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In order to obtain a relation between subjective measures for room sound effects and physical values, when time and space structures of early reflection sounds in an auditorium are varied, we conducted hearing tests for excellence of sound in the sound field simulated by a sound synthesizing system. In this paper, procedures and results of multi-variate analysis of the psychological scales obtained from the subjective assessments and those of the physical values are presented. For the original sound for the hearing test, string music played in an anechoic chamber was used. Test sounds from the original were reproduced in pairs through a digital delay unit, attenuates, and loundspeakers set in the anechoic chamber in accordance with test conditions. Fig. 4 gives the arrangement of the loudspeakers. For the test conditions, time-delay and the reproducing level of sounds from the loudspeakers S_2〜S_6 were controlled, so that the number of reflection sounds within 85 ms of time delay was 2〜8, and that of the conditions was 54. Other physical values at the listening point were as follows. (a) Ratio of early to reverberant sound energy: 0. 77〜2. 74, (b) ratio of front to back sound energy: 3. 03〜5. 04, and (c) listening sound pressure level: 83. 3〜86. 3 dB. The hearing test was carried out on these 700 or so pairs of stimuli compiled at random, with two engineers selected as listeners. Data of the assessment were constructed in spaces from dimensions 1 to 5 by means of Kruskal's multidimensional scaling. However, the configuration converged in 3 dimensions under the experimental conditions. Values corresponding to each configuration axis in 3 dimensional space were named as subjective measures I, II, and III respectively, and the correlation between these and 10 physical values was studied. In order to extract the physical values corresponding with 3 of the subjective measures as independently as possible, the varimax method was used. That is, coordinates of the measures were rotated in a space of 3 degrees of freedom, and by multivariate analysis of the rotations measured and the physical values, structure vectors of each composite variable, which were orthogonal to each other, were calculated. As a result, excellent correlations were obtained for the following: (a) Subjective measure I; ratio of early to reverberant sound energy and level of reflection sounds from the front horizontal directions of the listener, (b) subjective measure II; listening sound pressure level and number of reflection sounds, and (c) subjective measure III; ratio of front to back sound energy.
社団法人日本音響学会の論文
1976-10-01

室内の響きに関する心理尺度と諸物理量の相関

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