Robust estimation, interpretation and assessment of likelihood ratios in forensic speaker recognition
EntityUAM. Departamento de Ingeniería Informática
10.1016/j.csl.2005.08.005Computer Speech & Language 20.2-3 (2006): 331-335
ISSN0885-2308 (print); 1095-8363 (online)
Funded byThis work was in part supported by the Spanish Ministry for Science and Technology under projects TIC2003-09068-C02-01 and TIC2003-08382-C05-01.
SubjectsForensic Speaker Recognition; Evidence; Interpretation; Robust; Bayesian likelihood ratio; Tippett plots; Informática; Telecomunicaciones
NoteThis is the author’s version of a work that was accepted for publication in Computer Speech & Language. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Computer Speech & Language,20, 2-3, (2005)] DOI: 10.1016/j.csl.2005.08.005
Proceedings of Odyssey 2004: The speaker and Language Recognition Workshop (Toledo, Spain)
Rights© 2005 Elsevier B.V. All rights reserved
Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
In this contribution, the Bayesian framework for interpretation of evidence when applied to forensic speaker recognition is introduced. Different aspects of the use of voice as evidence in the court are addressed, as well as the use by the forensic expert of the likelihood ratio as the right way to express the strength of the evidence. Details on computation procedures of likelihood ratios (LR) are given, along with the assessment tools and methods to validate the performance of these Bayesian forensic systems. However, due to the practical scarcity of suspect data and the mismatched conditions between traces and reference populations common in daily casework, significant errors appear in LR estimation if specific robust techniques are not applied. Original contributions for the robust estimation of likelihood ratios are fully described, including TDLRA (target dependent likelihood ratio alignment), oriented to guarantee the presumption of innocence of suspected but non-perpetrators speakers. These algorithms are assessed with extensive Switchboard experiments but moreover through blind LR-based submissions to both NFI-TNO 2003 Forensic SRE and NIST 2004 SRE, where the strength of the evidence was successfully provided for every questioned speech-suspect recording pair in the respective evaluations.
Google Scholar:González Rodríguez, Joaquín - Drygajlo, Andrzej - Ramos Castro, Daniel - García-Gomar, Marta - Ortega García, Javier
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