Comparison of vocal tract transfer functions calculated using one-dimensional and three-dimensional acoustic simulation methods
Comparison of vocal tract transfer functions calculated using one-dimensional and three-dimensional acoustic simulation methods
复制标题
DOI：
10.21437/interspeech.2014-94
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
H. Takemoto;P. Mokhtari;T. Kitamura
中科院分区：
文献类型：
--
作者：
H. Takemoto;P. Mokhtari;T. Kitamura
声道的声学特性已经在文献中使用一维（1D）声学模拟方法进行了广泛的研究。由于1D方法仅假设平面波传播，因此它被认为仅在低频区域（低于约4或5kHz）有效。近年来，为了获得更精确的声道声学特性，发展了一种三维（3D）声学仿真方法。在本研究中，从男性的声道形状，传递函数计算使用1D和3D的方法，并相互比较，以评估的有效频率范围的1D方法。因此，当梨状窝的声学效应被认为是在1D方法中，传递函数彼此一致，高达7 kHz（忽略小倾角）。3D方法显示，咽部中的横向共振模式在约8kHz处产生深凹陷。在此下降频率以上，传递函数彼此不一致。因此，1D方法对于该受试者在高达7 kHz时有效。因为该对象具有相对大的声道，所以通常有效频率范围的上限可以超过8kHz。
Acoustic characteristics of the vocal tract have been investigated extensively in the literature using a onedimensional (1D) acoustic simulation method. Because the 1D method assumes plane wave propagation only, it is recognized to be valid only in the low frequency region (below about 4 or 5 kHz). Recently, a three-dimensional (3D) acoustic simulation method was developed, to obtain more precise acoustic characteristics of the vocal tract. In the present study, from a male’s vocal tract shapes, transfer functions were calculated using the 1D and 3D methods and compared with each other to evaluate the valid frequency range of the 1D method. As a result, when acoustic effects of the piriform fossae were considered in the 1D method, the transfer functions agreed with each other up to 7 kHz (ignoring small dips). The 3D method showed that a deep dip was generated at around 8 kHz by the transverse resonance mode in the pharynx. Above this dip frequency, the transfer functions disagreed with each other. Thus, the 1D method is valid up to 7 kHz for this subject. Because this subject has a relatively large vocal tract, in general the upper limit of the valid frequency range could exceed 8 kHz.