使用置信区间的基频特征对Ⅰ-Vector系统的性能补偿  

Pitch Improve Compensation Performance for Ⅰ-Vector System Based on Confidence Interval

作　　者：琚炜 李锐[1] 李辉[1] 

机构地区：[1]中国科学技术大学电子科学与技术系语音信息处理实验室,合肥230027

出　　处：《小型微型计算机系统》2016年第7期1629-1632,共4页Journal of Chinese Computer Systems

摘　　要：采用多系统融合可以降低话者确认系统的等误识率(EER),融合策略一般是将多个系统的得分进行线性加权.这种方式是将每个系统得分情况作统一考虑,没有关注到各个系统自身得分的实际分布,某个系统表现不好的测试得分可能会劣化其他系统的优秀得分,从而对整个系统性能的提升有限.提出一种基于置信区间的融合策略,对I-Vector基线系统和基频辅助系统各设置一个置信区间,只有当基线系统的得分不在置信区间内并且辅助系统得分处于其置信区间时,才将两个系统的得分进行融合,否则仍然采取基线系统的得分.本文的方法充分利用了各系统的得分置信度,在NIST数据库上的实验表明,相对IVector基线系统,融合系统的性能提升了12.37%.Adopting multiple systems fusion can reduce the Equal Error Rate（ EER） of the speaker verification system,the fusion strategy of the multiple systems is the score linear weighted. This method puts the score of each systems into consideration,but the actual score distribution of each systems is not take into account,the bad score of one system may degrade good score of other systems,so improved the performance of the whole system limited. This paper proposes a fusion strategy based on confidence interval,for I-Vector baseline system and the pitch auxiliary system each set a confidence interval,only when the score of baseline system is not within the confidence interval and auxiliary system score in its confidence interval,to score for fusion of the two systems,or still take baseline system score. On the NIST database experiments showthat the performance of the fusion system increased 12. 37%than I-Vector baseline system.

关 键 词：话者确认 置信区间 I-Vector系统 得分融合 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]