What did Bain really say? A preliminary forensic analysis of the disputed utterance based on data, acoustic analysis, statistical models, calculation of likelihood ratios, and testing of validity

Geoffrey Stewart Morrison*, Michael Hoy

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference publication

Abstract

This paper presents a preliminary analysis of the disputed utterance in Bain v R [2009] NZSC 16. A likelihood ratio is calculated as a strength-of-evidence statement with respect to the question: What is the probability of getting the acoustic properties of the disputed utterance if Bain had said "I shot the prick" versus if he had said "I can't breathe". In particular, an acoustic and statistical analysis is conducted on the first segment of the second word to estimate the probability of getting the acoustics of this segment if it were a postalveolar fricative versus if it were a palatal fricative. The validity of the system is tested and ways to improve the analysis are discussed.

Original languageEnglish
Title of host publicationAES 46th International Conference - Audio Forensics: Recording, Recovery, Analysis, and Interpretation
Pages203-207
Number of pages5
Publication statusPublished - 1 Jun 2012
Event46th International Conference of the Audio Engineering Society, AES 2012 - Denver, CO, United States
Duration: 14 Jun 201216 Jun 2012

Conference

Conference46th International Conference of the Audio Engineering Society, AES 2012
CountryUnited States
CityDenver, CO
Period14/06/1216/06/12

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