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It is well-established that prosodic structure has an influence on speech production. However, a great deal of the work showing the influence of prosody on articulation and acoustics has fo-cused on segments known to exhibit considerable variability in their production. Sibilants are highly constrained speech segments , due to the precise aerodynamic tasks(More)
The tongue is critical in the production of speech, yet its nature has made it difficult to measure. Not only does its ability to attain complex shapes make it difficult to track, it is also largely hidden from view during speech. The present article describes a new combination of optical tracking and ultrasound imaging that allows for a noninvasive,(More)
Task-space control is well studied in modeling speech production [1, 2, 3, 4]. Implementing control of this kind requires an accurate kinematic forward model. Despite debate about how to define the tasks for speech (i.e., acoustical vs. articu-latory), a faithful forward model will be complex and infeasi-ble to express analytically. Thus, it is necessary to(More)
A structural magnetic resonance imaging study has revealed that pharyngeal articulation varies considerably with voicing during the production of English fricatives. In a study of four speakers of American English, pharyngeal volume was generally found to be greater during the production of sustained voiced fricatives, compared to voiceless equivalents.(More)
This paper reports on an acoustic experiment to investigate prosodic and segmental factors governing the degree of spirantization of intervocalic /g/ in Castilian Spanish. Significant variation in the degree of /g/-spirantization, measured here in terms of relative acoustic energy, is found to be conditioned by stress and the quality of the vowels adjacent(More)
We present and evaluate two statistical methods for estimating kinematic relationships of the speech production system: artificial neu-ral networks and locally-weighted regression. The work is motivated by the need to characterize this motor system, with particular focus on estimating differential aspects of kinematics. Kinematic analysis will facilitate(More)
Due to its aerodynamic, articulatory, and acoustic complexities, the fricative /s/ is known to require high precision in its control, and to be highly resistant to coarticulation. This study documents in detail how jaw, tongue front, tongue back, lips, and the first spectral moment covary during the production of /s/, to establish how coarticulation affects(More)
The tongue is a deformable object, and moves by compressing or expanding local functional segments. For any single phoneme, these functional tongue segments may move in similar or opposite directions, and may reach target maximum synchronously or not. This paper will discuss the independence of five proposed segments in the production of speech. Three(More)
The study investigated the articulatory basis of locus equations, regression lines relating F2 at the start of a Consonant-Vowel (CV) transition to F2 at the middle of the vowel, with C fixed and V varying. Several studies have shown that consonants of different places of articulation have locus equation slopes that descend from labial to velar to alveolar,(More)