【摘要】 目的　研究鼻化元音的频谱特点 ,建立有效反映其特点的观察指标。方法　应用通用语音频谱分析系统 (universalspeechspectrumanalyse,USSA)对 40例腭裂术前和 2 8例腭裂术后腭咽闭合不全儿童的典型腭裂语音及 32名健康儿童的语音进行声学分析。结果　鼻化元音的固有共振峰频率无明显改变 ,低频区均有各自位置相对固定的额外峰出现 ,高频区能量明显衰减。结论　鼻化元音的频谱与正常元音相比较有明显特点 ,鼻腔共振指数和能量衰减指数可有效反映鼻化元音声学特征。更多还原

【Abstract】 Objective To study the spectrum features of nasalized vowels and set up effective indexes to reflect the features. Methods The acoustic features of 100 children’s speech, aged 5 to 12 years old, consisted of 40 unrepaired cleft palate children, 28 VPI children and 32 normal children, were studied by the application of digital spectrograph.Results No significant changes in the frequency of inherent formants of each vowel, appearance of one relatively fixed extra formant in the low frequency area, and the energy of high frequency area being damped obviously were the main spectrum features of nasalized vowels. Conclusion There are three main features on the spectrums of nasalized vowels compared to that of oral vowels. Nasal resonance index (NRI) can effectively distinguish the extra formant in low frequency area of oral vowel /a/ from nasalized vowel /a/. Energy damping index (EDI) can effectively reflect that the energy of high frequency area of each nasalized vowel is damped obviously.更多还原