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本文以语言所普通话语音数据库中十五个人的零声母音节声学参数为基础,对/ao/与/ou/这样一对极易相混的二合元音韵母内部频率域和时间域特性的协同变化进行微观分析.重点解析它们的频率特性随时间而协同变化的行为及其相关结构方面的异同,并给出相应的统计参数和相关的时频协变模式. 相似文献
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研究对成年口吃者在流畅朗读过程中的塞音进行了声学分析,测量了嗓音起始时间并且计算了塞音爆破时刻的频谱矩,并将口吃者在言语矫治前后与非口吃者进行了对比。多因素方差分析结果显示,口吃者嗓音起始时间虽稍长于非口吃者但未达到统计意义上的显著性差异水平,而且受发音部位和韵母的影响程度较大。同时还观察到矫治前口吃者和非口吃者在塞音爆破段的频谱均值呈现出显著性差异,口吃者频谱均值低于非口吃者可能是由于口吃者舌与齿龈或软硬腭形成阻塞的部位在声道中偏后所导致,还发现口吃者韵母对塞音爆破段频谱的影响较小,此结果表明口吃者表现出相对较弱的协同发音现象。口吃者经过言语矫治后塞音的嗓音起始时间和爆破段频谱有向非口吃者逼近的趋势。 相似文献
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References: 《声学学报:英文版》2007,26(2):168-179
A method used for objective evaluation of pronunciation of finals in standard Chinese is presented. The formant pattern of final is selected as the mam feature and an improved evaluation algorithm based on Support Vector Machine is proposed. In this algorithm, two-level classification strategy is employed. A full-classification model and a sub-classification model are trained for each final. The pronunciation quality is evaluated based on the classification results of this two-level strategy with scoring model of each final. The new evaluation method is compared with traditional methods such as Hidden Markov Model (HMM) posterior probability scoring method and feature of Mel-Frequency Cepstrum Coefficients (MFCC), and the results show that the performance is effectively improved by the proposed method. The correlation of scores between human testers and machine has achieved 82%. 相似文献
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