Readers 读者
Prosodic boundaries effect on segment articulation in standard chinese: An articulatory and acoustic study
韵律边界对汉语普通话音段发音的影响— 基于发音生理和声学的研究
Yinghao Li 李英浩
Abstract 摘要
This paper presents an electropalatographic (EPG) and acoustic study of prosodic boundaries effect on the domain-initial segments in Standard Chinese.1 Two speech sounds, namely, the voiceless unaspirated alveolar stop /t/ and the high front vowel /i/, were studied to examine the domain-initial strengthening in both spatial and temporal dimensions. The articulatory and acoustic parameters of the speech sounds were compared in initial positions of five prosodic constituents in Standard Chinese, namely, a Syllable, a Foot, an Immediate Phrase, an Intonational Phrase, and an Utterance. The results show that: (1) the production of the domain-initial consonantal gesture was prosodically encoded. The linguopalatal contact and the seal duration varied as a function of the prosodic boundary strength. The linguopalatal contact was dependent on the seal duration in a nonlinear fashion. Of the acoustic properties of the domain-initial stop, the total voiceless interval and voicing during closure were found to be reliable acoustic correlates that mark the hierarchical structure of the prosody. (2) At the release moment of the domain-initial stop, no consistent pattern was found to support the domain-initial strengthening. The linguopalatal contact of the vowel immediately following the domain-initial consonant did not show a clear trend of domain-initial strengthening; however, the phonatory features of vowels were indicative of pitch reset at major prosodic boundaries. These indicate that the domain-initial strengthening is restricted on the segment immediately following the boundary. In conclusion Standard Chinese strengthens the phonetic features of the domain-initial segments as a function of boundary strength, which serves as an important way to mark prosodic structure in Standard Chinese.
本文使用动态电子腭位元(EPG)和声学分析的方法，考察汉语普通话韵律边界对韵律单元域首音段的发音生理和声学特征的影响。我们选取普通话的清不送气齿龈塞音/t/和前高母音/i/，从音段产生的空间域和时间域分析域首发音增强现象。普通话的韵律层级包括音节、音步、小韵律短语、大韵律短语和话语。通过比较不同韵律层次域首音段的发音生理和声学参数，我们发现：（1）单元域首辅音的发音动作受到普通话韵律结构的制约。辅音的舌腭接触和生理持阻时长与韵律边界的强度密切相关；辅音的舌腭接触与生理持阻时长之间呈现出非线性关系；辅音声学时段的清声段时长和浊声时长比能够有效地标记韵律边界的强度。（2）辅音除阻时刻的舌腭接触以及辅音后接母音的最大舌腭接触受边界强度的影响较小，且后接母音的嗓音特征与较大韵律边界的基频重设有关。这说明域首发音增强的作用域限于韵律边界后面的音段。研究结果表明，普通话韵律单元域首音段的发音特征得到增强，且增强程度与边界强度密切相关，这是标示普通话韵律结构的一个重要方式。
Subject Keywords 关键词
Prosodic boundaries 韵律边界 Segment articulation 音段发音 Electropalatography 动态电子腭位元 Standard Chinese 汉语普通话