计算机应用研究2012，Vol.29Issue(8)：2921-2925,5.DOI:10.3969/j.issn.1001-3695.2012.08.032
一种改进的基于决策树的英文韵律短语边界预测方法
Improved decision tree based method for English prosodic phrase boundary prediction
张元平 1凌震华 1戴礼荣 1刘庆峰1
作者信息
- 1. 中国科学技术大学电子工程与信息科学系,合肥230027
- 折叠
摘要
Abstract
In English speech synthesis systems, the accuracy of prosodic phrase boundary prediction has a critical influence on the naturalness and intelligibility of synthetic speech. Currently, decision tree based prediction is the most popular method for predicting the prosodic phrase boundaries. However, this method can't build models for specific keywords because of the data balance issue. Besides, it wouldn' t be possible to achieve the global optimization by the local optimization search method at prediction stage. Therefore, in order to improve the prediction performance, this paper introduced the conditional probability of prosodic phrases, and used Viterbi algorithm to optimize the prosodic phrase boundary probability and conditional probability simultaneously. Furthermore, it proposed an optimization method for probability distribution of the decision tree nodes, based on location distribution characteristics of keywords in prosodic phrases. The experimental results show that F-Score of phrase boundary prediction increases from 68. 7% to 77. 8% and the non-acceptance rate drops from 22.4% to 15. 2% after adopting the proposed method.关键词
语音合成/韵律短语/边界预测/决策树/位置分布Key words
speech synthesis/prosodic phrase/boundary prediction/decision tree/location distribution分类
信息技术与安全科学引用本文复制引用
张元平,凌震华,戴礼荣,刘庆峰..一种改进的基于决策树的英文韵律短语边界预测方法[J].计算机应用研究,2012,29(8):2921-2925,5.
