Determining the length and cross-sectional area of the vocal tract jointly from formants using acoustic sensitivity function
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- Kaburagi Tokihiko
- Faculty of Design, Kyushu University
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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., 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.
収録刊行物
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- Acoustical Science and Technology
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Acoustical Science and Technology 35 (6), 290-299, 2014
一般社団法人 日本音響学会
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詳細情報 詳細情報について
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- CRID
- 1390282680066393984
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- NII論文ID
- 130004703723
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- NII書誌ID
- AA11501808
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- ISSN
- 13475177
- 03694232
- 13463969
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- NDL書誌ID
- 025885114
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可