This paper presents the characteristic extraction of violin bowing based upon the information on the spectral structure and the sound pressure. A professional violinist and the beginners served as subjects. Each of them played a simple scale on d^1 string. In this case, each pitch is played twice by martele with down bow and up bow without vibrato. Although there will be several factors which characterize the bowing of violin, two factors of bow pressure and sound pressure are selected among them. Firstly, an experiment as to bow pressure is done and it is proved that relatively high order harmonics get strong with the higher bow pressure. On the other hand, the strength of relatively high order harmonics of each beginner's playing is measured and compared with that of the professional's. It is concluded that the beginners' pressure are higher than the professional's on the whole. Secondly, the gradient of sound pressure of each monotone is measured. The consistency is found, in the case of professional, that the gradient of the tone by down is somewhat greater than that of the same pitch by the successive up bow. It shows that the professional regards two monotones played in a certain pitch as one musical group separated from another pitch.
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