Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Tokihiko Kaburagi Last modified date:2021.10.07

Professor / Communicative Acoustic Systems / Department of Communication Design Science / Faculty of Design

1. Tokihiko Kaburagi, Ayame Kato, Yuri Fukuda, and Fumiaki Taguchi, Control of the vocal tract when experienced saxophonists perform normal notes and overtones, Acoustical Science and Technology, doi:10.1250/ast.42.83, 42, 2, 83-92, 2021.03.
2. Yogaku Lee, Mitsuru Oya, Tokihiko Kaburagi, Shunsuke Hidaka, and Takashi Nakagawa, Differences among mixed, chest, and falsetto registers: A multiparametric study, Journal of voice, DOI:, 2021.01.
3. Tokihiko Kaburagi, Momoyo Ando, Yasufumi Uezu, Source-filter interaction in phonation: A study using vocal-tract data of a soprano singer, Acoustical Science and Technology,, 40, 5, 313-324, 2019.09.
4. Masahiro Okada, Tokihiko Kaburagi, Isao Tokuda, Acoustic measurements of the infinitesimal phase response curve from a sounding organ pipe, Physics Letters A,, 2019.03.
5. Tokihiko Kaburagi, Takuma Shimizu, Yasufumi Uezu, A morphological and acoustic analysis of the vocal tract during the act of whistling, Acoustical Science and Technology,, 39, 3, 198-206, 2018.05.
6. Masahiro Okada, Tokihiko Kaburagi, Higher-order frequency locking of an organ pipe: A measurement study based on synchronization theory, The Journal of the Acoustical Society of America, DOI: 10.1121/1.5027238, 143, 3, 1514-1522, 2018.03.
7. Yasufumi Uezu, Kaburagi Tokihiko, A measurement study on voice instabilities during modal-falsetto register transition, Acoustical Science and Technology,, 37, 6, 267-276, 2016.11.
8. Hidetsugu Uchida, Kohei Wakamiya, Tokihiko Kaburagi, Improvement of measurement accuracy for the three-dimensional electromagnetic articulograph by optimizing the alignment of the transmitter coils, Acoustical Science and Technology, doi:10.1250/ast.37.106, 37, 3, 106-114, 2016.05.
9. Kaburagi Tokihiko, A method for estimating vocal-tract shape from a target speech spectrum, Acoustical Science and Technology, doi:10.1250/ast.36.428, 36, 5, 428-437, 2015.09.
10. Kaburagi Tokihiko, Determining the length and cross-sectional area of the vocal tract jointly from formants using acoustic sensitivity function, Acoustical Science and Technology, 10.1250/ast.35.290, 35, 6, 290-299, 2014.11, A method for determining the length and cross-sectional area of the vocal tract from target formants is presented. The area function was approximated by summing several mode functions to reduce the number of degrees of freedom among the area parameters. Furthermore, the tract length was represented as a function of the coefficients for two principal modes. The estimation was made based on the perturbation relationship, i.e., a sensitivity function was used to represent the change in formant frequency due to a small perturbation of the vocal-tract shape. Starting from initial values, the vocal-tract parameters were optimized iteratively, and the sensitivity functions were used as linear constraints to update the parameter values. The estimation accuracy was examined using area function data for 10 English vowels (Story and Titze, J.¥ Phon.,¥ {¥bf 26}, 223--260, 1998). The results showed that the method is capable of determining vocal-tract shape with a satisfactory degree of accuracy, though the estimation accuracy strongly depends on the type of vowel. The dependency of the estimation error on the initial values of the parameters was also investigated..
11. Kaburagi Tokihiko, Tetsuro Takano, Yuki Sakamoto, Estimating area function of the vocal tract from formants using a sensitivity function and least-squares, Acoustical Science and Technology, 34, 5, 301-310, 2013.09.
12. Kaburagi Tokihiko, Effect of channel asymmetry on the behavior of flow passing through the glottis, Acoustical Science and Technology, 33, 6, 348-358, 2012.11.
13. Kaburagi Tokihiko, Naoyuki Yamada, Satoshi Fukui, Eriko Minamiya, A methodological and preliminary study on the acoustic effect of a trumpet player's vocal tract, Journal of the Acoustical Society of America, 130, 1, 536-545, 2011.07, 管楽器の奏者は、音高によって舌などの口腔形状を変化させることが経験的に知られている。これは、楽器本体と奏者の気道(肺、気管、口腔)とが、音響的に結合するためであると考えられる。本研究では、楽器(トランペット)演奏中の声道形状をMRI(磁気共鳴画像法)を用いて3次元観測し、得られる声道形状データを基として、楽器と気道を含む総合的な音響モデルの構築を行った。また、本モデルを用いて計算機による吹奏シミュレーションを行い、高音域における唇の振動に対する気道の音響的効果を定量的に示すことができた。本研究で得られた結果は、構造体の自励振動を伴う音響結合系の一般理論への展開が期待される。.
14. Kaburagi Tokihiko, Voice production model integrating boundary-layer analysis of glottal flow and source-filter coupling, Journal of the Acoustical Society of America, 129, 3, 1554-1567, 2011.03, 人間固有のコミュニケーション手段である音声言語について、その特質を明らかにするため、特に人の発声の物理的過程を表すモデルを検討した。発声の音響学的な過程においては、肺からの呼気によって声帯の自励振動が生じ、声帯音源が生成される。声帯音源は周期性を有することから、音声のアクセントやイントネーションの形成に寄与する。ここでは、声門を通過する呼気を粘性流として境界層近似に基づく解析を行い、さらにまた、声帯音源の機構と声道音響管とのカップリング現象に着目して、多様な発声現象における機構解明を試みた。.
15. Kaburagi Tokihiko, Yosuke Tanabe, Low-dimensional models of the glottal flow incorporating viscous-inviscid interaction, Journal of the Acoustical Society of America, 125, 1, 391-404, 2009.01.
16. Kaburagi Tokihiko, On the viscous-inviscid interaction of the flow passing through the glottis, Acoustical Science and Technology, 29, 2, 167-175, 2008.03.
17. Kaburagi Tokihiko, Kouji Kawai, Shinya Abe, Analysis of voice source characteristics using a constrained polynomial representation of voice source signals, Journal of the Acoustical Society of America, 121, 2, 745-748, 2007.02.
18. Kaburagi Tokihiko, Jiji Kim, Generation of the vocal tract spectrum from the underlying articulatory mechanism, Journal of the Acoustical Society of America, 121, 1, 456-468, 2007.01.
19. Kaburagi Tokihiko, Kohei WAKAMIYA, Masaaki Honda, Three-dimensional electromagnetic articulography:A measurement principle, Journal of the Acoustical Society of America, 10.1121/1.1928707, 118, 1, 428-443, 2005.07.
20. Akinori Fujino, Tokihiko Kaburagi, Masaaki Honda, Emi Murano, and Niimi Seiji,
Analysis of temporal coordination between oral and laryngeal articulatory motions in Japanese voiceless consonants,
J. Acoustical Society of Japan, Vol.59, No.3, pp.121-130, 2003..
21. Masaaki Honda, Akinori Fujino, Kaburagi Tokihiko, Compensatory responses of articulators to unexpected perturbation of the palate shape, Journal of Phonetics, 30, 3, 281-302, 2002.07.
22. Kaburagi Tokihiko, Masaaki Honda, Electromagnetic articulograph based on a nonparametric representation of the magnetic field, Journal of the Acoustical Society of America, 111, 3, 1414-1421, 2002.03.
23. Kaburagi Tokihiko, Masaaki Honda, Dynamic articulatory model based on multidimensional invariant-feature task representation, Journal of the Acoustical Society of America, 110, 1, 441-452, 2001.07.
24. Kaburagi Tokihiko, Masaaki Honda, Calibration methods of voltage-to-distance function for an electromagnetic articulometer (EMA) system, Journal of the Acoustical Society of America, 101, 4, 2391-2394, 1997.04.
25. Kaburagi Tokihiko, Masaaki Honda, A model of articulator trajectory formation based on the motor tasks of vocal-tract shapes, Journal of the Acoustical Society of America, 99, 5, 3154-3170, 1996.05.
26. Kaburagi Tokihiko, Masaaki Honda, Determination of sagittal tongue shape from the positions of points on the tongue surface, Journal of the Acoustical Society of America, 96, 3, 1356-1366, 1994.09.
27. Kaburagi Tokihiko, Masaaki Honda, An ultrasonic method for monitoring tongue shape and the position of a fixed point on the tongue surface, Journal of the Acoustical Society of America, 95, 4, 2268-2270, 1994.04.