中文说明：EM算法与HMM参数估计，viterbi算法，前向算法，后向算法，Baum-Welch算法的matlab代码，附带一篇学习笔记。
English Description：
EM algorithm and parameter estimation for HMM and Viterbi algorithm, the forward algorithm and backward algorithm, Baum-Welch algorithm Matlab code, plus a learning note.