Measurements of the Impression of Three Pieces of Sounds Based on Visual Analog Scale by Small Samples

This paper discusses that measurements of the impression of three pieces of sounds using box-and-whisker plot, univariate scatter plot and cluster analysis based on Visual Analog Scale (VAS) by small samples. Eight healthy people are invited as the experiment participants, two pieces of music (minor music and major music) and natural sound (babbling of a stream) are employed as the test pieces. All participants are asked to listen to the test pieces individually. In order to analyze their impression of music or sound, they are asked to answer the questionnaire on VAS (7 questions; "Bright-Dark", "Happy-Sad", and so on) individually. The results show that subjective evaluation values based on the impression (ex. "happy", "sad", "bright", "dark", and so on) of test pieces have been obtained and visualized by a combination of box-and-whisker plot and univariate scatter plot. In addition, it has been discovered that the difference of the impression by the different sounds can be expressed. Moreover, it has also discovered that the questions based on the similar impression belong to the same cluster. And as the results of minor music, they are agreed with our previous study (more, the participants of this study are not the same as that participants) [8].