Effects of surprisal and boundary strength on phrase-final lengthening
Effects of surprisal and boundary strength on phrase-final lengthening
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DOI：
10.21437/speechprosody.2020-30
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
B. Andreeva;Bernd Möbius;James Whang
中科院分区：
文献类型：
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作者：
B. Andreeva;Bernd Möbius;James Whang
本研究考察了韵律结构（音高重音和边界强度）和信息密度（ID）对短语末音节时长的影响。短语的最后音节持续时间和以下停顿持续时间进行了测量的一个子集的德国广播新闻语料库（DIRNDL），包括约5小时的手动注释的讲话。韵律注释与自动音段语调模型一致，并包括音高重音和边界音调的标签。我们把停顿持续时间作为边界强度的定量代理。基于在DeWaC语料库上训练的语言模型，ID被计算为先前上下文的音节三元组的长度。我们发现，音节长度和短语的音节长度之间存在显著的正相关关系。音节持续时间作为一个函数的音节和韵律因素（音高重音和边界强度）的线性混合效应模型进行了统计建模。结果表明，音节强度和边界强度对短语末音节时长的影响存在交互作用。具有高元音值的音节在较强的边界之前较长，而低元音值的音节在较弱的边界之前较长。这种边界前音节时长的调节作用是在公认的短语末端延长效应之外观察到的。
This study examines the influence of prosodic structure (pitch accents and boundary strength) and information density (ID) on phrase-final syllable duration. Phrase-final syllable durations and following pause durations were measured for a subset of a German radio-news corpus (DIRNDL), consisting of about 5 hours of manually annotated speech. The prosodic annotation is in accordance with the autosegmental intonation model and includes labels for pitch accents and boundary tones. We treated pause duration as a quantitative proxy for boundary strength. ID was calculated as the surprisal of the syllable trigram of the preceding context, based on language models trained on the DeWaC corpus. We found a significant positive correlation between surprisal and phrase-final syllable duration. Syllable duration was statistically modeled as a function of surprisal and prosodic factors (pitch accent and boundary strength) in linear mixed effects models. The results revealed an interaction of surprisal and boundary strength with respect to phrase-final syllable duration. Syllables with high surprisal values are longer before stronger boundaries, whereas low-surprisal syllables are longer before weaker boundaries. This modulation of pre-boundary syllable duration is observed above and beyond the well-established phrase-final lengthening effect.