Model-based classification of nonstationary vocal fold vibrations
Model-based classification of nonstationary vocal fold vibrations
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DOI：
10.1121/1.2211550
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发表时间：
2006-08-01
影响因子：
2.4
通讯作者：
Lohscheller, Joerg
中科院分区：
文献类型：
--
作者：
Wurzbacher, Tobias;Schwarz, Raphael;Lohscheller, Joerg
声带振动分类是嗓音疾病客观评价的一项重要工作。由于历史的原因，传统的声带振动的临床检查是在静止，持续发声。然而，从静止发声得出的结论仅限于观察到的稳态声带振动，不能推广到语音机制在运行讲话。本研究旨在探讨以音高提升为形式的非平稳发声范例中声带振荡的实时录音的分类方法。该分类是基于来自一个时间依赖性的生物力学的两个质量模型的声带，这是适应观察到的声带运动曲线与优化程序的不对称措施。在验证算法性能后，将该方法应用于临床问题。十名正常的声音和10个发声障碍的主题录音进行了评估，以及在固定和非固定发声。在非平稳发声的情况下，基于模型的分类为“正常”和“发声障碍”的成功在所有情况下，而它在持续发声的情况下失败。非平稳声带振动包含了声带不规则性的额外信息，这是客观解释和分类嗓音疾病所需要的。(c)2006年，美国声学学会。
Classification of vocal fold vibrations is an essential task of the objective assessment of voice disorders. For historical reasons, the conventional clinical examination of vocal fold vibrations is done during stationary, sustained phonation. However, the conclusions drawn from a stationary phonation are restricted to the observed steady-state vocal fold vibrations and cannot be generalized to voice mechanisms during running speech. This study addresses the approach of classifying real-time recordings of vocal fold oscillations during a nonstationary phonation paradigm in the form of a pitch raise. The classification is based on asymmetry measures derived from a time-dependent biornechanical two-mass model of the vocal folds which is adapted to observed vocal fold motion curves with an optimization procedure. After verification of the algorithm performance the method was applied to clinical problems. Recordings of ten subjects with normal voice and ten dysphonic subjects have been evaluated during stationary as well as nonstationary phonation. In the case of nonstationary phonation the model-based classification into "normal" and "dysphonic" succeeds in all cases, while it fails in the case of sustained phonation. The nonstationary vocal fold vibrations contain additional information about vocal fold irregularities, which are needed for an objective interpretation and classification of voice disorders. (c) 2006 Acoustical Society of America.