An improved model for the acoustic radiation impedance of the mouth based on an equivalent electrical network

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• 作者：Vojnovi?? ; Milan ; Miji?? ; Miomir
• 关键词：Mouth radiation impedance ; Formant ; Vocal tract
• 刊名：Applied Acoustics
• 出版年：2005
• 出版时间：May, 2005
• 年：2005
• 卷：66
• 期：5
• 页码：481-499
• 全文大小：411 K

文摘

This paper proposes a model for acoustic radiation impedance of the mouth in the form of the equivalent electrical network. Five known models of radiation impedance are compared: radiation of a circular piston set in a spherical baffle: radiation of a circular piston set in an infinite baffle, the Flanagan model, the Wakita and Fant model, and the Stevens, Kasowski and Fant model. The proposed model most accurately approximates the radiation impedance of a circular piston set in a spherical baffle. Differences between the acoustic resistance and reactance calculated by the proposed model and the piston set in a spherical baffle of 9 cm radius are relatively small in the kr < 2 region. The deviations in calculated values of the acoustic resistance and the reactance are within ±0.023 × ρc/A_m and ±0.008 × ρc/A_m, respectively, where A_m denotes the area of the mouth aperture. The accuracy of the proposed model is demonstrated by vowel formant frequency calculations. Differences in formant frequencies calculated by applying the proposed model and the piston set in a spherical baffle model are less than 0.3 % .