Automatic Mispronunciation Detection for English Learners by GMM-UBM and GLDS-SVM Methods
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摘要: 将语种和说话人识别的方法应用到英语发音错误检测系统, 提出一种基于广义线性区分序列支持向量机 (Generalized linear discriminant sequence based SVM, GLDS-SVM)的发音错误检测方法. 主要创新点为: 1)提出一种基于状态拼接的特征规整方案, 增强SVM对发音特征的建模能力; 2)提出一种基于多模型融合的模型训练策略, 该策略可以更加充分地利用训练数据, 并在一定程度上解决了由于真实发音错误数据缺乏造成的正负样本不均衡的问题; 3)将GLDS-SVM与基于通用背景模型GMM (Universal background models based GMM, GMM-UBM)的方法进行融合, 以进一步提高发音检错性能. GLDS-SVM和GMM-UBM的融合系统在仿真测试集和真实测试集上的等错误率 (Equal error rate, EER)分别达到9.92%和16.35%. 同时, GLDS-SVM在模型占用空间和运算速度方面均比传统径向基函数 (Radial basic function, RBF)核方法具有明显优势.Abstract: The paper proposes an efficient generalized linear discriminant sequence based SVM (GLDS-SVM) based mispronunciation detection method. Firstly, in order to enhance the ability of describing pronunciation characteristics, we introduce an improved SVM feature normalization scheme based on state-concatenated operation. Then, we propose a novel multi-model strategy for model training to make full use of samples and solve the problem of data unbalance caused by lack of the actual mispronunciation corpus. Finally, we combine GLDS-SVM with universal background models based GMM (GMM-UBM) to further improve the performance. The fused system by these two methods achieves 9.92% and 16.35% in equal error rate (EER) for simulation set and real set, respectively. Meanwhile, GLDS-SVM processes a higher computation speed and smaller model size than traditional radial basic function (RBF) kernel.
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