Publications
ResearcherID : C-5956-2008 (TY, h-index: 23) , AAZ-8749-2021 (RK, h-index: 6)
Google Scholar : TY (h-index: 32), RK (h-index: 7)
2021
Kiyoshi Yatsui, Chihiro Yamada, Yuta Yoshida, Takashi Yatsui
Improving sound of clarinet by coating lacquerware (Wajima-nuri) Journal Article
In: Japanese Journal of Applied Physics, 60 (10), pp. 107002, 2021.
Abstract | Links | BibTeX | Tags: Wajima-nuri
@article{clarinet,
title = {Improving sound of clarinet by coating lacquerware (Wajima-nuri)},
author = {Kiyoshi Yatsui and Chihiro Yamada and Yuta Yoshida and Takashi Yatsui},
doi = {10.35848/1347-4065/ac26e4},
year = {2021},
date = {2021-10-08},
urldate = {2021-09-15},
journal = {Japanese Journal of Applied Physics},
volume = {60},
number = {10},
pages = {107002},
abstract = {Thick films of lacquers by Wajima-nuri were coated only on a barrel and a bell of a clarinet. Significant change of sound characteristics has been observed on the frequency spectra analyzed by FFT. For octave below on A3 (220 Hz), the resonant peaks appear in 8 ~ 10 kHz only coated both on the outer and inner surfaces. For octave above on A5 (880 Hz), dissonances found before the coating disappeared by the coating. The half width of the resonant peaks becomes narrower, resulting in the sharp sounds after being Wajima-nuri. At 15 kHz ~ 20 kHz, the width of the peaks becomes sharp, and the sound pressures are extraordinarily strong if coated on both surfaces. All peaks of sound pressures were shifted to higher frequencies by Wajima-nuri. The improvement of sound characteristics is most effective coated on both inside and outside the barrel and bell of clarinet.},
keywords = {Wajima-nuri},
pubstate = {published},
tppubtype = {article}
}
Thick films of lacquers by Wajima-nuri were coated only on a barrel and a bell of a clarinet. Significant change of sound characteristics has been observed on the frequency spectra analyzed by FFT. For octave below on A3 (220 Hz), the resonant peaks appear in 8 ~ 10 kHz only coated both on the outer and inner surfaces. For octave above on A5 (880 Hz), dissonances found before the coating disappeared by the coating. The half width of the resonant peaks becomes narrower, resulting in the sharp sounds after being Wajima-nuri. At 15 kHz ~ 20 kHz, the width of the peaks becomes sharp, and the sound pressures are extraordinarily strong if coated on both surfaces. All peaks of sound pressures were shifted to higher frequencies by Wajima-nuri. The improvement of sound characteristics is most effective coated on both inside and outside the barrel and bell of clarinet.
2020
Kiyoshi Yatsui, Hidehiko Asaoka, Yuta Yoshida, Takashi Yatsui
Change of sound characteristics of yidaki (didgeridoo) coated with thick films of lacquer (Wajima-nuri) Journal Article
In: Japanese Journal of Applied Physics, 59 (7), pp. 077002, 2020.
Abstract | Links | BibTeX | Tags: Wajima-nuri
@article{Yatsui_2020,
title = {Change of sound characteristics of yidaki (didgeridoo) coated with thick films of lacquer (Wajima-nuri)},
author = {Kiyoshi Yatsui and Hidehiko Asaoka and Yuta Yoshida and Takashi Yatsui},
doi = {10.35848/1347-4065/ab9277},
year = {2020},
date = {2020-06-01},
journal = {Japanese Journal of Applied Physics},
volume = {59},
number = {7},
pages = {077002},
publisher = {IOP Publishing},
abstract = {Thick films of lacquers were coated by Wajima-nuri on a yidaki (didgeridoo), a woodwind instrument loved by indigenous Australians from ancient times. An investigation of frequency spectra of fast Fourier transform before and after the coating revealed a significant enhancement of sound pressure from the yidaki coated by Wajima-nuri, particularly in the low-frequency region of 500 Hz–1 kHz. All peaks of the sound pressures were shifted to higher frequencies by the Wajima-nuri. The improvement of sound characteristics was greater by Wajima-nuri both inside and outside the yidaki than by Wajima-nuri on the outside only. It might have been due to the fact that the lacquers soaked through the perforated holes and cracks inherent to the original yidaki. Urushiol in lacquers tends to solidify by oxidative polymerization, which resulted in a smooth surface that suppressed the turbulence of the air breathed. These results could be useful for other musical instruments.},
keywords = {Wajima-nuri},
pubstate = {published},
tppubtype = {article}
}
Thick films of lacquers were coated by Wajima-nuri on a yidaki (didgeridoo), a woodwind instrument loved by indigenous Australians from ancient times. An investigation of frequency spectra of fast Fourier transform before and after the coating revealed a significant enhancement of sound pressure from the yidaki coated by Wajima-nuri, particularly in the low-frequency region of 500 Hz–1 kHz. All peaks of the sound pressures were shifted to higher frequencies by the Wajima-nuri. The improvement of sound characteristics was greater by Wajima-nuri both inside and outside the yidaki than by Wajima-nuri on the outside only. It might have been due to the fact that the lacquers soaked through the perforated holes and cracks inherent to the original yidaki. Urushiol in lacquers tends to solidify by oxidative polymerization, which resulted in a smooth surface that suppressed the turbulence of the air breathed. These results could be useful for other musical instruments.