An empirical estimate of the precision of likelihood ratios from a forensic-voice-comparison system

被引：30

作者：

Morrison, Geoffrey Stewart ^{[1
,2
]}

Zhang, Cuiling ^{[2
,3
]}

Rose, Philip ^{[2
]}

机构：

[1] Univ New S Wales, Sch Elect Engn & Telecommun, Forens Voice Comparison Lab, Sydney, NSW 2052, Australia

[2] Australian Natl Univ, Sch Language Studies, Canberra, ACT 0200, Australia

[3] China Criminal Police Univ, Dept Forens Sci & Technol, Shenyang 110854, Liaoning, Peoples R China

来源：

FORENSIC SCIENCE INTERNATIONAL | 2011年 / 208卷 / 1-3期

基金：

澳大利亚研究理事会;

关键词：

Forensic voice comparison; Validity; Reliability; Accuracy; Precision; Credible interval; SPEAKER RECOGNITION; FORMANT TRAJECTORIES; FUSION;

D O I：

10.1016/j.forsciint.2010.11.001

中图分类号：

DF [法律]; D9 [法律]; R [医药、卫生];

学科分类号：

0301 ; 10 ;

摘要：

An acoustic-phonetic forensic-voice-comparison system was constructed using the time-averaged formant values of tokens of 61 male Chinese speakers' /i/, /e/, and /a/ monophthongs as input. Likelihood ratios were calculated using a multivariate kernel density formula. A separate set of likelihood ratios was calculated for each vowel phoneme, and these were then fused and calibrated using linear logistic regression. The system was tested via cross-validation. The validity and reliability of the results were assessed using the log-likelihood-ratio-cost function (C-llr, a measure of accuracy) and an empirical estimate of the credible interval for the likelihood ratios from different-speaker comparisons (a measure of precision). The credible interval was calculated on the basis of two independent pairs of samples for each different-speaker comparison pair. (c) 2010 Elsevier Ireland Ltd. All rights reserved.

引用

页码：59 / 65

页数：7

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