焦点重音对普通话音段产出和声学特征的影响

Effects of focal accent on segmental articulation and acoustical properties in standard Chinese

为考察普通话焦点重音对窄焦点域内和域外音段的产出和声学特征的影响,使用动态电子腭位（EPG）获取/t/和/i/的舌腭接触信号,同时采集同步的声门阻抗（EGG）和声学信号。分析结果表明,在窄焦点域内,/t/的舌腭接触面积增大,生理持阻时长增长,持阻段声门状态相对紧张。/i/的舌体上升并前移,元音时长和声强增长或增大,元音频谱发生变化。焦点重音的溢出效应不明显。研究结果表明：焦点重音使得域内所有音段的发音动作均增强,但是域外音段的产出和声学特征一般不受影响。

The focal accent in standard Chinese affects the articulatory and acoustical properties of the segments inside and outside the narrow focus domain. The linguopalatal contacts of the segments /t/ and /i/ were obtained using electropalatography （EPG）, with electroglottographic （EGG） and acoustic signals simultaneously recorded. The results show that the narrow focus domain has larger linguopalatal contact and alveolar seal duration for /t/. The vocal folds during the consonantal closure interval tend to be tense. The tongue gesture of /i/ is raised and fronted. The duration and intensity of the vowels become longer and louder and their spectral properties are modified. The spill-over effect of the focal accent is not clear but the production of the segments inside the narrow focus domain are generally strengthened. The focal accent does not affect the articulation and acoustical properties of segments outside the domain.