MEASUREMENT OF SOUND-PRESSURE DISTRIBUTION IN REPLICAS OF THE ORAL CAVITY
MEASUREMENT OF SOUND-PRESSURE DISTRIBUTION IN REPLICAS OF THE ORAL CAVITY
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DOI：
10.1121/1.404430
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发表时间：
1992-11-01
影响因子：
2.4
通讯作者：
NAGAI, N
中科院分区：
文献类型：
--
作者：
MOTOKI, K;MIKI, N;NAGAI, N
通过测量人工口腔中声压的空间分布，研究了声波在声道中的传播特性。测量与石膏复制品的口腔，和纯音被用作驱动信号，以获得在不同频率的振幅和相位分布。平面波传播，这已被广泛假设为语音产生模型，检查从测量的声压的空间分布。介质颗粒的轨迹和声强度的矢量图，可以从测量的压力分布计算，也被提出来可视化口腔中的声场。结果表明，在某些频率下，存在声压绝对为零的点，相位在空间上围绕它们循环。直到大约4 kHz，除了在这些特定频率，波前几乎是一维的，尽管在垂直方向上可以看到振幅梯度。
The spatial distributions of sound pressure in artificial oral cavities were measured to examine the characteristics of wave propagation in the vocal tract. The measurement was performed with plaster replicas of the oral cavity, and pure tones were used as the driving signals to obtain both amplitude and phase distributions at varied frequencies. Plane-wave propagation, which has been widely assumed for speech production models, was examined from the measured spatial distributions of sound pressure. Trajectories of media particles and vectorial maps of acoustic intensity, which can be computed from the measured pressure distributions, were also presented to visualize the acoustic field in the oral cavity. The results showed that at certain frequencies there existed points where sound pressure was absolutely zero, with the phase spatially circulating around them. Up to about 4 kHz, except at these certain frequencies, the wave front was almost one-dimensional, though an amplitude gradient was seen in the vertical direction.