Acoustic measurement of Marimba, Xylophone and Xylorimba

Masanobu Miuraa and Nozomiko Yasuib

aHachinohe Institute of Technology
bGraduate School of Science and Engineering, Saitama University

Monday, September 16, 2019 from 10:20 to 10:40

in Summer Theater

Abstract :
A set of wooden-keyboard percussion instruments, namely xylophone, marimba and xylorimba are acoustically compared. Since the size of xylophone and marimba has not had a standard size, their size and tone have a variety among them. More concretely, an American company Deagan produced the xylorimba between 1920- 1930, which was played by a xylophone player Yoichi Hiraoka, and then conveyed to Japan. The timber of xylophone is felt as to have the features of both marimba and xylophone. The acoustic feature is, however, not measured until now. A professional marimba player cooperated in our experiment. She is asked to play a single note C4 with a consistent hard mallet. The power spectrum of recorded acoustic signal is evaluated in terms of salient peaks on the recorded sound. Although the salient peaks on marimba and xylophone are almost well-known shapse, the one on the xylorimba has a distinct feature, which has 1) consonant peaks to F0, such as 2oct and 3oct+perfect 5th and 2) dissonant peaks to F0, such as 3oct major 2 degree (detuned to +1 and +22 cents). Therefore, the xylorimba is acoustically confirmed as to have both xylophone and marimba’s features.

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