Decision strategies for robust speaker verification

Pao Yue-kong Library Electronic Theses Database

Decision strategies for robust speaker verification

 

Author: Cheung, Man-yee Miranda
Title: Decision strategies for robust speaker verification
Degree: M.Sc.
Year: 2001
Subject: Speech processing systems
Automatic speech recognition
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Electronic Engineering
Pages: vi, 68 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1599579
URI: http://theses.lib.polyu.edu.hk/handle/200/396
Abstract: In this dissertation, a new decision strategy based on statistical post-processing of speakers' scores is proposed for speaker verification. Specifically, the dissertation explores the possibility of enhancing the state-of-the-art speaker verification systems by taking into account the discrepancy between speaker's scores and his/her decision threshold. To this end, speaker's scores are ranked according to their proximity to the decision threshold. Non-parametric statistical tests, such as the Wilcoxon signed rank test, are applied to the ranked scores. The Wilcoxon signed rank test is presented in detail and the reasons for choosing it to do the post-processing of speakers' scores are explained. Experimental results, based on 76 speakers of the TIMIT corpus, show that the performance of a vector quantization-based speaker verification system is improved after applying the Wilcoxon test. The method is very general and can be easily extended to other speaker verification systems.

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