ACOUSTIC AND PERCEPTUAL INVARIANCE IN SPEECH

这项提案的广泛目标是继续开发和测试 语音中的声学不变性理论。为此，我们将延长我们的 鼻音和塞音中发音位置的研究 通过研究摩擦词的不变性质是否可以得到 在这两个辅音类别中的发音位置。我们还将探索 这些属性在多大程度上概括了这些不同的 发音的方式。对于鼻音，我们将探索相对的变化 在鼻腔附近的高频和低频的光谱能量 放手。对于摩擦，我们将探索频谱模式和总体 摩擦噪声的幅值特性以及模式 摩擦释放附近的光谱变化。此外, 我们将调查一些与发音方式有关的语音维度 发音。我们将进一步阐述所提出的不变性质 通过检查振幅变化的模式来区分停止和滑行 在停止滑行附近的特定频段发生的 放手。最后，我们将尝试确定不变属性是否可以 派生为鼻塞音对比和塞音擦音 对比度。对于鼻塞音的区分，我们将探索语音 通过研究鼻腔的光谱特性来表现[鼻腔]特征 元音共振峰出现杂音和鼻化。对于 停顿-塞音-摩擦对比，我们将重点放在幅度模式上 辅音发音早期部分的变化。 我们的总体研究策略包括表演详细的声学 自然言语符号分析与感知实验 使用人工合成和计算机编辑的自然语音。世界银行的目标是 声学分析是为了识别与以下相关的不变特性 特定的语音特征，以设计算法来量化这些 属性，并通过应用 一组新的自然语音数据。感知实验将是 帮助我们专注于声学的潜在关键部分 不变属性可能驻留的信号，并探索 这些属性的感知结果用于识别 特殊的语音维度。

The broad objectives of this proposal are to continue to develop and test a theory of acoustic invariance in speech. To this end, we will extend our research on place of articulation in stop consonants to nasals and fricatives by investigating whether invariant properties can be derived for place of articulation in these two consonant classes. We will also explore the extent to which such properties generalize across these different manners of articulation. For nasals, we will explore the relative changes in spectral energy at high and low frequencies in the vicinity of the nasal release. For fricatives, we will explore the spectral patterns and overall amplitude characteristics of the fricative noise, as well as the patterns of spectral change in the vicinity of the fricative release. In addition, we will investigate a number of phonetic dimensions relating to manner of articulation. We will further elaborate the invariant property proposed for the stop-glide distinction by examining patterns of amplitude change occurring in particular frequency bands in the vicinity of the stop-glide release. Finally, we will attempt to determine if invariant properties can be derived for the nasal-stop contrast and the stop-affricate-fricative contrast. For the nasal-stop distinction, we will explore the phonetic feature [nasal] by investigating the spectral properties of the nasal murmur and the presence of nasalization in the vowel formants. For the stop-affricate-fricative contrast, we will focus on patterns of amplitude change in the early portions of the consonant release. Our general research strategy includes performing detailed acoustic analyses of natural speech tokens and conducting perception experiments using synthetic and computer-edited natural speech. The goals of the acoustic analyses are to identify those invariant properties relating to particular phonetic features, to devise algorithms for quantifying these properties, and to test the effectiveness of these measures by applying them to a new set of natural speech data. Perception experiments will be conducted to help us focus on potentially critical portions of the acoustic signal where invariant properties are likely to reside, and to explore the perceptual consequences of these properties for the identification of particular phonetic dimensions.