抄録
Maintaining alertness of machine operators such as automobile drivers has become more important. We remarked auditory stimulation and considered pleasant and arousal sound stimuli. We carried out a meta-analysis about sharpness of sound based on a hypothesis that a sound with large sharpness value has an arousal effect. First, we gathered sound data with sharpness, loudness and subjective evaluation from previous research documents using sharpness. As a result of the meta-analysis about sharpness values, we clarified that there were pleasant sounds with large sharpness value above 3acum. Secondly, we made a general multiple regression equation of loudness and sharpness to estimate subjective evaluation about pleasant-unpleasant. Thirdly, we proposed a new method for estimating a semantic orientation (positive/negative impression) of a sound source by adding a positive/negative value of the word of sound and a positive/negative value of its soundclass (noise/sound/timbre). Finally, we showed a map of pleasant and arousal sounds by the estimated semantic orientations and the mean sharpness values of sound sources. We could select ‘among the mountains’, ‘a brook’ and ‘a birdsong’ as pleasant and arousal sounds and considered each use case as a sound stimulus.
