Experimental and numerical investigation of the sound generation mechanisms of sibilant fricatives using a simplified vocal tract model
Experimental and numerical investigation of the sound generation mechanisms of sibilant fricatives using a simplified vocal tract model
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DOI：
10.1063/1.5013632
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发表时间：
2018-03-01
影响因子：
4.6
通讯作者：
Wada, Shigeo
中科院分区：
文献类型：
--
作者：
Yoshinaga, Tsukasa;Nozaki, Kazunori;Wada, Shigeo
使用简化的声道模型，通过实验测量和大涡模拟研究了咝擦音的发声机制。声道几何形状被简化为三维矩形通道，并且通过移动舌头及其收缩的通道的位置来表达发/s/和/s/摩擦音时几何形状的差异。实验结果表明，随着舌距牙齿距离的增加，摩擦音的特征峰值频率降低。数值模拟表明，收缩处产生的射流撞击上牙壁，在牙缝的上游和下游引起主要声源。虽然声源的幅度随着频率的增加而减小，但收缩部下游的压力的幅度在相应舌头位置的峰值频率处增加。这些结果表明，峰值频率处的声压因缩颈下游通道中的声学共振而增加，并且通过改变缩颈和声道内的声节点位置而产生/s/和/s/之间不同的频率特性。由 AIP 出版社出版。
The sound generation mechanisms of sibilant fricatives were investigated with experimental measurements and large-eddy simulations using a simplified vocal tract model. The vocal tract geometry was simplified to a three-dimensional rectangular channel, and differences in the geometries while pronouncing fricatives /s/ and /s/ were expressed by shifting the position of the tongue and its constricted flow channel. Experimental results showed that the characteristic peak frequency of the fricatives decreased when the distance between the tongue and teeth increased. Numerical simulations revealed that the jet flow generated from the constriction impinged on the upper teeth wall and caused the main sound source upstream and downstream from the gap between the teeth. While magnitudes of the sound source decreased with increments of the frequency, amplitudes of the pressure downstream from the constriction increased at the peak frequencies of the corresponding tongue position. These results indicate that the sound pressures at the peak frequencies increased by acoustic resonance in the channel downstream from the constriction, and the different frequency characteristics between /s/ and /s/ were produced by changing the constriction and the acoustic node positions inside the vocal tract. Published by AIP Publishing.