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  本文選題：流形學(xué)習(xí) + 低維可視化�。� 參考：《江蘇師范大學(xué)》2014年碩士論文

【摘要】：漢語方言辨識研究的核心問題之一是方言特征的提取,因為特征提取的好壞直接關(guān)系到系統(tǒng)性能的高低。傳統(tǒng)的特征提取大多數(shù)沿襲語種識別的理論和方法,忽視了漢語方言自身的有調(diào)性等區(qū)分意義較大的特征;其次,語音數(shù)據(jù)是一種典型的流形分布數(shù)據(jù),一些好的關(guān)于流形分布的算法沒有被應(yīng)用到漢語方言辨識中;傳統(tǒng)系統(tǒng)采用的單一特征在數(shù)據(jù)的結(jié)構(gòu)描寫和信息的挖掘等方面有著很大的局限性。針對以上不足,論文將流形學(xué)習(xí)算法引入到漢語方言辨識系統(tǒng)中,從漢語方言語音低維可視化、流形學(xué)習(xí)算法提取漢語方言特征、流形學(xué)習(xí)算法的改進和特征融合等幾個方面提升漢語方言辨識系統(tǒng)性能。具體成果如下:1.證明了漢語方言語音中流形結(jié)構(gòu)的存在。從低維可視化的角度對漢語方言語音進行了分析研究,仿真實驗結(jié)果表明相對于線性降維算法,流形學(xué)習(xí)算法在漢語方言語音低維的時候能夠更好地體現(xiàn)不同地區(qū)方言語音之間的差異性,間接證明了漢語方言語音數(shù)據(jù)中流形結(jié)構(gòu)的存在。2.利用流形學(xué)習(xí)提取了漢語方言辨識新特征。通過對低維流形結(jié)構(gòu)的觀察與流形學(xué)習(xí)算法的分析研究,利用其中局部線性嵌入算法對漢語方言語音進行特征提取。3.在流形學(xué)習(xí)算法的基礎(chǔ)上對局部線性嵌入算法本身進行了改進。針對局部嵌入算法本身存在的不足,對其中的距離求取方法進行改進,旨在改善樣本數(shù)據(jù)集的分布,并結(jié)合聚類算法提取漢語方言語音新特征。4.構(gòu)建了一套基于流形學(xué)習(xí)的漢語方言辨識系統(tǒng),證明了新特征的有效性。利用高斯混合模型和支撐矢量機作為系統(tǒng)后端分類器。仿真實驗結(jié)果表明新特征可以有效地提高系統(tǒng)的性能。同時利用特征融合的方法對新特征和傳統(tǒng)特征進行了有效地融合,進一步提升了特征的有效性。
[Abstract]:The extraction of dialect features is one of the core problems in the research of Chinese dialect recognition, because the quality of feature extraction is directly related to the performance of the system.The traditional theories and methods of feature extraction mostly follow the language recognition, ignoring the tonality of Chinese dialects and other distinguishing features. Secondly, the speech data is a kind of typical manifold distribution data.Some good algorithms on manifold distribution have not been applied to Chinese dialect recognition, and the single feature used in traditional systems has great limitations in data structure description and information mining.In this paper, manifold learning algorithm is introduced into the Chinese dialect recognition system, and the feature of Chinese dialect is extracted from the low dimensional visualization of Chinese dialect speech and manifold learning algorithm.The improvement and feature fusion of manifold learning algorithm improve the performance of Chinese dialect recognition system.The concrete results are as follows: 1.The existence of manifold structure in Chinese dialect pronunciation is proved.In this paper, the Chinese dialect speech is analyzed and studied from the view of low dimension visualization. The simulation results show that compared with the linear dimensionality reduction algorithm,Manifold learning algorithm can better reflect the difference of dialect pronunciation in different regions when the dimension of Chinese dialect speech is low, which indirectly proves the existence of manifold structure in Chinese dialect phonetic data.The new features of Chinese dialect recognition are extracted by manifold learning.Based on the observation of low dimensional manifold structure and the analysis of manifold learning algorithm, the local linear embedding algorithm is used to extract the features of Chinese dialect speech.Based on the manifold learning algorithm, the local linear embedding algorithm is improved.In order to improve the distribution of sample data set and to extract the new features of Chinese dialect speech, the distance estimation method is improved to improve the distribution of the sample data set in order to overcome the shortcomings of the local embedding algorithm.A Chinese dialect recognition system based on manifold learning is constructed, which proves the validity of the new features.Gao Si hybrid model and support vector machine are used as the back-end classifier of the system.Simulation results show that the new features can effectively improve the performance of the system.At the same time, the method of feature fusion is used to fuse the new feature and the traditional feature effectively, which further improves the effectiveness of the feature.
【學(xué)位授予單位】：江蘇師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN912.34

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