基于隐尔马可夫模型(HMM)的强制对齐方法被用于文语转换系统(TTS)语音单元边界切分。为提高切分准确性,本文对HMM模型的特征选择,模型参数和模型聚类进行优化。实验表明:12维静态M e l频率倒谱系数(M FCC)是最优的语音特征;HMM模型中的...基于隐尔马可夫模型(HMM)的强制对齐方法被用于文语转换系统(TTS)语音单元边界切分。为提高切分准确性,本文对HMM模型的特征选择,模型参数和模型聚类进行优化。实验表明:12维静态M e l频率倒谱系数(M FCC)是最优的语音特征;HMM模型中的状态模型采用单高斯;对于特定说话人的HMM模型,使用分类与衰退树(CART)聚类生成的绑定状态模型个数在3 000左右最优。在英文语音库中音素边界切分的实验中,切分准确率从模型优化前的77.3%提高到85.4%。展开更多
In order to overcome defects of the classical hidden Markov model (HMM), Markov family model (MFM), a new statistical model was proposed. Markov family model was applied to speech recognition and natural language proc...In order to overcome defects of the classical hidden Markov model (HMM), Markov family model (MFM), a new statistical model was proposed. Markov family model was applied to speech recognition and natural language processing. The speaker independently continuous speech recognition experiments and the part-of-speech tagging experiments show that Markov family model has higher performance than hidden Markov model. The precision is enhanced from 94.642% to 96.214% in the part-of-speech tagging experiments, and the work rate is reduced by 11.9% in the speech recognition experiments with respect to HMM baseline system.展开更多
Based on salient visual regions for mobile robot navigation in unknown environments, a new place recognition system was presented. The system uses monocular camera to acquire omni-directional images of the environment...Based on salient visual regions for mobile robot navigation in unknown environments, a new place recognition system was presented. The system uses monocular camera to acquire omni-directional images of the environment where the robot locates. Salient local regions are detected from these images using center-surround difference method, which computes opponencies of color and texture among multi-scale image spaces. And then they are organized using hidden Markov model (HMM) to form the vertex of topological map. So localization, that is place recognition in our system, can be converted to evaluation of HMM. Experimental results show that the saliency detection is immune to the changes of scale, 2D rotation and viewpoint etc. The created topological map has smaller size and a higher ratio of recognition is obtained.展开更多
文摘基于隐尔马可夫模型(HMM)的强制对齐方法被用于文语转换系统(TTS)语音单元边界切分。为提高切分准确性,本文对HMM模型的特征选择,模型参数和模型聚类进行优化。实验表明:12维静态M e l频率倒谱系数(M FCC)是最优的语音特征;HMM模型中的状态模型采用单高斯;对于特定说话人的HMM模型,使用分类与衰退树(CART)聚类生成的绑定状态模型个数在3 000左右最优。在英文语音库中音素边界切分的实验中,切分准确率从模型优化前的77.3%提高到85.4%。
基金Project(60763001)supported by the National Natural Science Foundation of ChinaProjects(2009GZS0027,2010GZS0072)supported by the Natural Science Foundation of Jiangxi Province,China
文摘In order to overcome defects of the classical hidden Markov model (HMM), Markov family model (MFM), a new statistical model was proposed. Markov family model was applied to speech recognition and natural language processing. The speaker independently continuous speech recognition experiments and the part-of-speech tagging experiments show that Markov family model has higher performance than hidden Markov model. The precision is enhanced from 94.642% to 96.214% in the part-of-speech tagging experiments, and the work rate is reduced by 11.9% in the speech recognition experiments with respect to HMM baseline system.
基金Projects(60234030 ,60404021) supported by the National Natural Science Foundation of China
文摘Based on salient visual regions for mobile robot navigation in unknown environments, a new place recognition system was presented. The system uses monocular camera to acquire omni-directional images of the environment where the robot locates. Salient local regions are detected from these images using center-surround difference method, which computes opponencies of color and texture among multi-scale image spaces. And then they are organized using hidden Markov model (HMM) to form the vertex of topological map. So localization, that is place recognition in our system, can be converted to evaluation of HMM. Experimental results show that the saliency detection is immune to the changes of scale, 2D rotation and viewpoint etc. The created topological map has smaller size and a higher ratio of recognition is obtained.
