改进的HMM系统在英语语音合成中的研究

Study for English Synthesis with Improved HMM Synthesis Systems

根据英语语言所具有的一些特性对HMM模型进行改进,设计出适合英语语音合成的上下文属性集以及用于模型聚类的问题集,提高了其建模和训练效果。此外,借助HTK和Festival等工具,以基频和声道谱参数为训练参数,最终实现此英语语音合成系统。从所合成语句的效果来看,合成语音整体稳定流畅,而且节奏感比较强。

Speech synthesis is one of the key problems to realize human-machine interaction.The HMM-based speech synthesis could construct a synthesis system in such a short period,so as to achieve the purpose of diverse speech synthesis.In this paper the HMM-based trainable speech synthesis was applied for English application.The contextual features and corresponding question set for tree-based HMM clustering were designed by considering the characteristics of English,to improve the effect of HMM modeling and training.In addition,with the help of HTK and Festival,the English speech synthesis system was finally achieved taking the fundamental frequency and the sound channel parameter as the training paramenters.From the evaluation results of the final system,the synthesized voice turned out to be clear and fluent,and the rhythm was strong.