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An Acoustically Oriented VocalTract Model
Hani C. YEHIA Kazuya TAKEDA Fumitada ITAKURA
Publication
IEICE TRANSACTIONS on Information and Systems
Vol.E79D
No.8
pp.11981208 Publication Date: 1996/08/25 Online ISSN:
DOI: Print ISSN: 09168532 Type of Manuscript: PAPER Category: Speech Processing and Acoustics Keyword: vocaltract logarea function, formant frequencies, factor analysis, independent component analysis, singular value decomposition, articulatorytoacoustic inverse problem,
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Summary:
The objective of this paper is to find a parametric representation for the vocaltract logarea function that is directly and simply related to basic acoustic characteristics of the human vocaltract. The importance of this representation is associated with the solution of the articulatorytoacoustic inverse problem, where a simple mapping from the articulatory space onto the acoustic space can be very useful. The method is as follows: Firstly, given a corpus of logarea functions, a parametric model is derived following a factor analysis technique. After that, the articulatory space, defined by the parametric model, is filled with approximately uniformly distributed points, and the corresponding first three formant frequencies are calculated. These formants define an acoustic space onto which the articulatory space maps. In the next step, an independent component analysis technique is used to determine acoustic and articulatory coordinate systems whose components are as independent as possible. Finally, using singular value decomposition, acoustic and articulatory coordinate systems are rotated so that each of the first three components of the articulatory space has major influence on one, and only one, component of the acoustic space. An example showing how the proposed model can be applied to the solution of the articulatorytoacoustic inverse problem is given at the end of the paper.

