Many objective criteria by attenuation property of room acoustic energy have been suggested, and relationships with subjective attributes have been elucidated. The difference of synthetic subjective impression between sound fields could be discriminated by acoustical parameters i.e. objective criteria above, but details of mechanism in discrimination among different sound fields, weightings or grounds of judgment etc. have not been clarified. The purpose of this study is to clarify the discrimination factor over difference between sound fields. In this report, subjective experiments are carried out by using impulse response data of existing ten concert halls and music data, made from convolution of impulse responses and dry sources, as stimuli. In these experiments, subjects are asked to evaluate the impression of each stimulus, and to judge the difference among stimuli in pared comparison. The results of these experiments are analyzed and it seems that the factor related to the difference of Reverberance is dominant in discrimination by factor analysis, but there are some cases in which Loudness or Clarity is dominant. The weightings of factors, the boundary to switch judgment between factors etc. will be discussed.
When hearing music in an auditorium, audience is provided with aural information and visual information at the same time. Visual and auditory sense sometimes interact with each other so that the auditory sense is considered to have some influence on sound evaluation made by audience. The purpose of this study is to reveal an influence of visual information obtained in audience seats in a hall on subjective evaluation. We investigated the relationship between sound evaluation and whether a musical performance video as visual stimulus is provided or not, and between the sound evaluation and evaluation concerning the space at certain position in the audience seats. As a result, it was revealed that visual information gave statistically significant influence on sound evaluation.
In architectural and urban space, we are always exposed to multimodal stimuli of visual information and sound fields in various scenes of everyday life. The purpose of this study is to clarify relationship of subjective impression of vision and auditory, and acquire knowledge which contributes to architectural design or acoustic design. In this report, two following experiments are carried out in which subjects are presented with sound fields by real time convolution as auditory stimuli and panoramic VR images of 360 interactive views of interior as visual stimuli. (1) Comparison between subjective responses for single or multi modal presentations of visual and auditory stimuli from various architectural spaces. (2) Comparison between subjective responses for various combinations of multi modal presentations of visual and auditory stimuli from various architectural spaces. Analysis for results of these experiments clarify the influence of visual information upon the subjective impression for sound field and mutual relationship between subjective impression of vision and auditory of interior of buildings. It is already found that visual information significantly effects subjective impression for sound field by experiment 1, and the details of relationship between elements of visual information and parameters of sound field will be clarified by experiment 2.
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