Simulation of losses due to turbulence in the time-varying vocal system
Simulation of losses due to turbulence in the time-varying vocal system
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DOI：
10.1109/tasl.2006.889731
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发表时间：
2007-05-01
影响因子：
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通讯作者：
Kroger, Bernd J.
中科院分区：
文献类型：
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作者：
Birkhoz, Peter;Jackel, Dietmar;Kroger, Bernd J.
声带系统中狭窄出口处的流动分离会导致湍流和流体动力压力损失。在关节合成器中，与这种损失相关的压降通常被认为集中在收缩附近的一个特定位置，并由对流动的集中非线性阻力来表示。本文强调了在动态发音过程中，当收缩位置发生变化时，这种简化的损失处理的不连续性问题。不连续可能表现为合成语音信号中需要避免的不良声学伪影，以便进行高质量的发音合成。我们提出了一种基于对流体动力压力变化的更现实的分布式考虑的解决方案。所提出的方法在发音合成器中被实现，在那里它被证明可以防止任何声学伪影。
Flow separation in the vocal system at the outlet of a constriction causes turbulence and a fluid dynamic pressure loss. In articulatory synthesizers, the pressure drop associated with such a loss is usually assumed to be concentrated at one specific position near the constriction and is represented by a lumped nonlinear resistance to the flow. This paper highlights discontinuity problems of this simplified loss treatment when the constriction location changes during dynamic articulation. The discontinuities can manifest as undesirable acoustic artifacts in the synthetic speech signal that need to be avoided for high-quality articulatory synthesis. We present a solution to this problem based on a more realistic distributed consideration of fluid dynamic pressure changes. The proposed method was implemented in an articulatory synthesizer where it proved to prevent any acoustic artifacts.