At last, the experiments implement the Duration Distribution Based HMM by modifying HTK source code and result shows it have a significant improvement of accuracy rating.

• 实验最后通过修改HTK源代码实现基于段长分布的隐马尔科夫模型，结果表明，改进的隐马尔科夫模型在噪音环境下能获得更好的识别效果。