A method for estimating vocal-tract shape from a target speech spectrum
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- Kaburagi Tokihiko
- Faculty of Design, Kyushu University
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Abstract
We present a method to simultaneously estimate the cross-sectional area and length of the vocal tract from a speech spectrum. An iterative procedure determines the vocal-tract shape by gradually optimizing the parameter values to produce the target speech spectrum. The vocal-tract shape is updated in each iteration using a sensitivity function representing the change in formant frequency caused by a slight perturbation of the vocal-tract shape. Our method effectively optimizes the vocal-tract shape when combined with the perturbation relationship between the speech spectrum parameters (i.e., cepstral parameters) and formants. The estimation accuracy is examined using area function data for 10 English vowels (Story and Titze, J. Phon., 26, 223–260, 1998). The resulting average errors are 0.36 cm2 for the cross-sectional area and 0.21 cm for the vocal-tract length. This corresponds to a 17.6% and 1.24% error, respectively. The formant frequency recovered from the estimated vocal-tract shape has an error of less than 4% for each of the first four formants. We also determine that the fundamental frequency of the target speech spectrum has an influence on the estimation accuracy.
Journal
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- Acoustical Science and Technology
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Acoustical Science and Technology 36 (5), 428-437, 2015
ACOUSTICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390282680065102592
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- NII Article ID
- 130005097251
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- NII Book ID
- AA11501808
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- ISSN
- 13475177
- 03694232
- 13463969
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- NDL BIB ID
- 026703781
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed