リズム並びにテンポのゆらぎの数量化に関する研究 : あるギター曲のメロディーを例にとった場合

抄録

This is the report about the quantization method of the rhythm and fluctuation of tempo in the musical performance, and about these results. The method of analysis is as follows. The time intervals between the successive peaks of played tone of a melody are measured. The power spectrum of these time intervals is calculated by the Fourier analysis. The rhythm and the fluctuation of tempo in "Romance" used as the test melody are analysed. They are played on the guitar by different 10 players. The results obtained are as follows. 1) It is observed that the fluctuation of rhythm at low frequency components in power spectrum is dominant, and the high frequency components in power spectrum are comparatively small. However, there are few examples which the power of each component has no relation with the frequency. 2) The component which has the period same as the duration of three beats of the melody, is dominant in almost results. However, there are following two types as to this property of rhythm. a) The time duration of the 1st and the 2nd beat are short, and the 3rd one is long. b) The time duration of the 1st and the 3rd beat are long, and the 2nd ones is short.