Formant transitions in varied utterance positions.
Formant transitions in varied utterance positions.
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不同话语位置的共振峰转变。
DOI：
10.1159/000356478
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Kuo,Christina
中科院分区：
文献类型：
--
作者：
Kuo,Christina
目的研究与不同发音位置相关的声学特征，以了解发音边界附近潜在发音变化的声学后果。方法对12例健康的美国英语说话者在话语起始、话语终末和话语结束位置上的sew和sigh的两个双元音过渡和bee的一个辅音-元音过渡进行二次峰过渡特征的检测，包括过渡持续时间（ms）、过渡程度（Hz）和衍生过渡斜率（Hz/ms）。说话者执行了一项对比应力变化的任务，该任务用于证明声学特征的可变性，作为塑造声道的发音变化的指标。结果与不增加重读的单词相比，对比重读的单词有更长的过渡时间、更大的过渡程度和更小的坡度。虽然存在一些话语位置效应，但没有发现与边界强化或衰落相一致的系统差异。结论不同的发音位置可能与刺激依赖性的发音变化有关，这种变化反映在声输出上。这些结果表明，在临床实践和研究中，需要进一步了解载体短语等话语级言语材料的结构。
AimAcoustic characteristics associated with varied utterance positions were examined to understand the acoustic consequences of potential articulatory changes near utterance boundaries.MethodsSecond formant transition characteristics, including transition duration (ms), transition extent (Hz), and derived slope of transition (Hz/ms), of 12 healthy speakers of American English were examined for two diphthong transitions in sew and sigh and one consonant-vowel transition in bee in utterance-initial, utterance-final, and utterance-end positions. Speakers performed a task of contrastive stress variation that served to demonstrate the changeability of acoustic characteristics as an index of articulatory change in shaping the vocal tract.ResultsContrastive stress, as compared to words spoken without increased stress, was associated with longer transition duration, greater transition extent, and a decreased slope. Although some utterance position effects were present, no systematic differences consistent with boundary strengthening or declination were found.ConclusionFindings suggest that varied utterance positions may be associated with stimulus-dependent variation in articulatory changes that is reflected in the acoustic output. These results indicate the need to further understand the construct of utterance-level speech materials, such as carrier phrases, in clinical practice and research.