对构音障碍的发音空间和声学特征的分析研究

发布时间：2018-05-20 17:33

本文选题：构音障碍 + 语音分析　；参考：《天津大学》2014年硕士论文

【摘要】：本文基于TORGO数据库,通过对比分析构音障碍说话人和正常说话人的EMA数据,研究了构音障碍的发音空间特征和声学特征。相比单独分析声学信号的方法,直接测量发音位置有助于更准确地找出构音障碍的发音机制。本研究利用统计学的方法,基于连续语音状态下记录的英语EMA数据,比较了构音障碍语音和正常语音的区别,从发音和声学两个方面调查分析了构音障碍的特征。通过计算每个目标音素的发音位置点的分布,发现构音障碍的发音区域比正常区域的面积相对较小,并且发音位置更靠近口腔前部,这说明了构音障碍说话人的发音位置异常,难以像正常说话人一样充分利用发音空间。在声学分析方面,利用自相关函数、功率谱和线性预测分析的方法,分析了构音障碍语音的韵律、节奏和声源特征。结果表明正常说话人在重复辅音-元音序列时,可以保持稳定的节奏和能量,但是构音障碍说话人却很难保持发音的稳定性。同时,构音障碍的声源信号显示出不稳定的基音周期,反映了构音障碍说话人对声门运动控制不佳。
[Abstract]:Based on the TORGO database, this paper studies the spatial and acoustic characteristics of dysarthria by comparing and analyzing the EMA data of the speaker with dysarthria and the normal speaker. Compared with the method of analyzing acoustic signals alone, measuring the pronunciation position directly helps to find out the articulation mechanism of dysarthria more accurately. Based on the English EMA data recorded in the continuous speech state, this study compared the differences between dysarthria speech and normal speech, and investigated and analyzed the characteristics of dysarthria from two aspects: pronunciation and acoustics. By calculating the location distribution of each target phoneme, it is found that the area of articulation disorder is smaller than that of normal area, and the pronunciation position is closer to the anterior part of the mouth, which indicates that the articulation position of the speaker with dysarthria is abnormal. It is difficult to make full use of pronunciation space as a normal speaker. In the aspect of acoustic analysis, the prosody, rhythm and source characteristics of dyslexic speech are analyzed by means of autocorrelation function, power spectrum and linear predictive analysis. The results show that the normal speaker can maintain stable rhythm and energy when repeating consonant vowel sequence, but it is difficult for the speaker with dysarthria to maintain the stability of pronunciation. At the same time, the sound source signal of dysarthria shows unstable pitch period, which reflects the poor control of glottic movement by the speaker of dysarthria.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R767.92;TN912.3

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