Acoustical evaluation of differences in Sanshin’s tone depending on shapes of SAO

Kojiro Nishimiya, Mao Tokuda, Yuki Yokota and Hideo Cho

Aoyama Gakuin University

Saturday, September 14, 2019 from 16:20 to 16:40

in Summer Theater

Abstract :
Sanshin is an OKINAWA’s traditional musical string instrument. Generally, the sound board is one of the main factors on the string instrument’s tone from the acoustical points of view. Nevertheless, about Sanshin, the player and artisan have thought that Sao (Neck) has been the most important. Sanshin has many types of Sao and there have many arguments of the relationship between “Sao” and “Tone”. However, the sound mechanism is still not clarified. Therefore, the purpose of this research is to elucidate the sound mechanism of Sanshin which include the influence of Sao. We measured the Sanshin’s tone using different types of SAO with the same body, string, and bridge. As a result, we found the several differences in the tones. Especially the differences were confirmed in the frequency distributions and the attenuation rates. For the understanding of these behaviors, we focused about the change of the thickness and length of SAO, and the mass damping of the head of SAO. By the cutting works of one wood-Sanshin, we found that the thickness and length of SAO influence the frequency distributions and the mass damping influences the attenuation rate.

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