Empirical test of the performance of an acoustic-phonetic approach to forensic voice comparison under conditions similar to those of a real case

Enzinger, Ewald and Morrison, Geoffrey Stewart (2017). Empirical test of the performance of an acoustic-phonetic approach to forensic voice comparison under conditions similar to those of a real case. Forensic Science International, 277 , pp. 30-40.

Abstract

In a 2012 case in New South Wales, Australia, the identity of a speaker on several audio recordings was in question. Forensic voice comparison testimony was presented based on an auditory-acoustic-phonetic-spectrographic analysis. No empirical demonstration of the validity and reliability of the analytical methodology was presented. Unlike the admissibility standards in some other jurisdictions (e.g., US Federal Rule of Evidence 702 and the Daubert criteria, or England & Wales Criminal Practice Directions 19A), Australia's Unified Evidence Acts do not require demonstration of the validity and reliability of analytical methods and their implementation before testimony based upon them is presented in court. The present paper reports on empirical tests of the performance of an acoustic-phonetic-statistical forensic voice comparison system which exploited the same features as were the focus of the auditory-acoustic-phonetic-spectrographic analysis in the case, i.e., second-formant (F2) trajectories in /o/ tokens and mean fundamental frequency (f0). The tests were conducted under conditions similar to those in the case. The performance of the acoustic-phonetic-statistical system was very poor compared to that of an automatic system. © 2017 Elsevier B.V.

Publication DOI: https://doi.org/10.1016/j.forsciint.2017.05.007
Divisions: Languages & Social Sciences
Additional Information: © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: forensic voice comparison,acoustic-phonetic,spectrographic ,validity,reliability ,admissibility
Published Date: 2017-08

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