This study focused on an effect of sound transfer functions (STFs) on the equivalent perception between a visual stimulus and its associated sound. We performed experiments of an auditory-visual stimulus presentation using an audio-video clip of a man beating a drum on a road which had a feeling of depth with a perspective view. We employed four kinds of presentation distance between the subject and the visual target (drum) of 5, 10, 20, and 40 m and used two kinds of the drum sound; one was taken into account only the sound pressure level (SPL), and the other was taken into account both the SPL and the STF corresponding to each presentation distance. We produced the auditory-visual stimuli in each presentation distance by combining seven kinds of delay time between the auditory and visual stimuli from -8 F to 8 F(1F = 1/30 s) and nine levels of the auditory stimulus from -12 dB to 12 dB of a standard SPL and presented to the subjects in random order. We evaluated the sound pressure level matching with the size of the visual target (equivalent sound pressure level; ESPL) in each presentation distance and compared between the cases of taking into account only the SPL and of taking into account both the SPL and the STF. As results, we obtained that the ESPL intended to decrease as the time delay of the sound increased, and that the STF could be effective as a cue of the equivalent perception between the auditory and visual stimuli in relatively short distances.
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