摘要
在Baum Welch(BW)算法的基础上提出了一种基于态相关方法(State SpecificMethod:SSM)的隐马尔可夫模型(HiddenMarkovMode:HMM)参数估计算法(简称SBW算法).该算法在估计HMM不同状态的概率密度函数(proba bilitydensityfunction:PDF)的参数时使用了与状态有关的维数较低的特征集合.与传统的BW算法相比,新算法避免了直接估计高维的PDF参数.仿真实验表明,在训练数据量不足的情况下,采用SBW算法的误识率明显低于BW算法.
In this paper, we derive an algorithm based on well-known BW algorithm for estimating the parameters of a hidden Markov model (we call it SBW algorithm). SBW algorithm relies on a low dimensional state-specific feature set rather than rely on a common high dimensional feature set as conventional BW algorithm, so avoiding directly estimating high-dimensional probability density functions in HMM training. Our computer simulation example shows that the performance of the new algorithm is superior (over) the conventional Baum-Welch algorithm.
出处
《武汉大学学报(理学版)》
CAS
CSCD
北大核心
2003年第5期625-628,共4页
Journal of Wuhan University:Natural Science Edition
基金
湖北省教育厅重点项目基金资助项目(2002A02004)