Gaussian tree constraints applied to acoustic linguistic functional data

Gaussian tree constraints applied to acoustic linguistic functional data
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高斯树约束应用于声学语言功能数据

DOI:
10.1016/j.jmva.2016.09.015
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发表时间:
2017
影响因子:
1.6
通讯作者:
Shiers N
Shiers N
中科院分区:
数学2区
文献类型:
--
作者:
Shiers N

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语言的进化模型通常被认为采用树的形式。随着所谓的树约束的发展,可以通过检查观测变量的矩是否位于与高斯潜在树模型一致的区域内来评估树模型假设的合理性。在我们的语言应用程序中,数据集包含来自五种罗曼语言或方言的说话者的声学样本(录音)。目的是评估这些功能数据与语言级别的遗传树模型的兼容性。典型函数分析 (CFA) 与可分离协方差结构的新颖组合为数据提供了代表性基础。可分离的 CFA 基础由强调语言差异同时保持观察语言分组完整性的组件组成。然后将以前未利用的高斯树约束应用于数据的逐个组件投影,以研究对进化树的遵守情况。结果强调了罗曼语语音的某些方面,这些方面似乎与进化树模型兼容,但表明对所有特征都进行建模是不合适的。
Evolutionary models of languages are usually considered to take the form of trees. With the development of so-called tree constraints the plausibility of the tree model assumptions can be assessed by checking whether the moments of observed variables lie within regions consistent with Gaussian latent tree models. In our linguistic application, the data set comprises acoustic samples (audio recordings) from speakers of five Romance languages or dialects. The aim is to assess these functional data for compatibility with a hereditary tree model at the language level. A novel combination of canonical function analysis (CFA) with a separable covariance structure produces a representative basis for the data. The separable-CFA basis is formed of components which emphasize language differences whilst maintaining the integrity of the observational language-groupings. A previously unexploited Gaussian tree constraint is then applied to component-by-component projections of the data to investigate adherence to an evolutionary tree. The results highlight some aspects of Romance language speech that appear compatible with an evolutionary tree model but indicate that it would be inappropriate to model all features as such.
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