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

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/Published conference output › Conference 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 language	English
Title of host publication	AES 46th International Conference - Audio Forensics: Recording, Recovery, Analysis, and Interpretation
Pages	203-207
Number of pages	5
Publication status	Published - 1 Jun 2012
Event	46th International Conference of the Audio Engineering Society, AES 2012 - Denver, CO, United States Duration: 14 Jun 2012 → 16 Jun 2012

Conference

Conference	46th International Conference of the Audio Engineering Society, AES 2012
Country/Territory	United States
City	Denver, CO
Period	14/06/12 → 16/06/12

Cite this

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title = "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",

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.",

author = "Morrison, {Geoffrey Stewart} and Michael Hoy",

year = "2012",

month = jun,

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language = "English",

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note = "46th International Conference of the Audio Engineering Society, AES 2012 ; Conference date: 14-06-2012 Through 16-06-2012",

}

Morrison, GS & Hoy, M 2012, 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. in AES 46th International Conference - Audio Forensics: Recording, Recovery, Analysis, and Interpretation. pp. 203-207, 46th International Conference of the Audio Engineering Society, AES 2012, Denver, CO, United States, 14/06/12.

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. / Morrison, Geoffrey Stewart; Hoy, Michael.
AES 46th International Conference - Audio Forensics: Recording, Recovery, Analysis, and Interpretation. 2012. p. 203-207.

Research output: Chapter in Book/Published conference output › Conference publication

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T1 - 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

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AU - Hoy, Michael

PY - 2012/6/1

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N2 - 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.

AB - 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.

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AN - SCOPUS:84883122841

SN - 9780937803875

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EP - 207

BT - AES 46th International Conference - Audio Forensics: Recording, Recovery, Analysis, and Interpretation

T2 - 46th International Conference of the Audio Engineering Society, AES 2012

Y2 - 14 June 2012 through 16 June 2012

ER -

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

Abstract

Conference

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