A method for estimating vocal-tract shape from a target speech spectrum

• Kaburagi Tokihiko

  Faculty of Design, Kyushu University

抄録

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.

収録刊行物

• Acoustical Science and Technology

  Acoustical Science and Technology 36 (5), 428-437, 2015

  一般社団法人 日本音響学会

キーワード

• Vocal-tract area function
• Vocal-tract length
• Speech spectrum
• Cepstral parameters
• Inverse estimation

詳細情報

• CRID: 1390282680065102592
• NII論文ID: 130005097251
• NII書誌ID: AA11501808
• DOI: 10.1250/ast.36.428
• ISSN: 13475177
• ISSN: 03694232
• ISSN: 13463969
• NDL書誌ID: 026703781
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I026703781
• Web Site: https://www.jstage.jst.go.jp/article/ast/36/5/36_E1520/_pdf
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
  • CiNii Articles
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