Forensic voice comparison with monophthongal formant trajectories - A likelihood ratio-based discrimination of 'schwa' vowel acoustics in a close social group of young Australian females

Phil Rose

doi:10.1109/ICASSP.2015.7178886

Forensic voice comparison with monophthongal formant trajectories - A likelihood ratio-based discrimination of 'schwa' vowel acoustics in a close social group of young Australian females

Phil Rose^*

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

7 Citations (Scopus)

Abstract

An experiment is described relating to estimation of strength of evidence in likelihood ratio-based forensic voice comparison. It is asked whether a better performance is obtained from point estimation of formant pattern targets in monophthongal vowel acoustics rather than formant trajectories. The hypothesis is tested on non-contemporaneous recordings of a custom-built challenging database of 26 young Australian female voices performing a map task. Evaluation with the log likelihood ratio cost validity metric Cllr shows that both trajectory and target perform well, but that contrary to phonological predictions, evidence based on monophthongal F-pattern trajectory is superior to target point measurements.

Original language	English
Title of host publication	2015 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	4819-4823
Number of pages	5
ISBN (Electronic)	9781467369978
DOIs	https://doi.org/10.1109/ICASSP.2015.7178886
Publication status	Published - 4 Aug 2015
Event	40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015 - Brisbane, Australia Duration: 19 Apr 2014 → 24 Apr 2014

Publication series

Name	ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Volume	2015-August
ISSN (Print)	1520-6149

Conference

Conference	40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015
Country/Territory	Australia
City	Brisbane
Period	19/04/14 → 24/04/14

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10.1109/ICASSP.2015.7178886

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Rose, P. (2015). Forensic voice comparison with monophthongal formant trajectories - A likelihood ratio-based discrimination of 'schwa' vowel acoustics in a close social group of young Australian females. In 2015 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015 - Proceedings (pp. 4819-4823). Article 7178886 (ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings; Vol. 2015-August). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICASSP.2015.7178886

Rose, Phil. / Forensic voice comparison with monophthongal formant trajectories - A likelihood ratio-based discrimination of 'schwa' vowel acoustics in a close social group of young Australian females. 2015 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2015. pp. 4819-4823 (ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings).

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title = "Forensic voice comparison with monophthongal formant trajectories - A likelihood ratio-based discrimination of 'schwa' vowel acoustics in a close social group of young Australian females",

abstract = "An experiment is described relating to estimation of strength of evidence in likelihood ratio-based forensic voice comparison. It is asked whether a better performance is obtained from point estimation of formant pattern targets in monophthongal vowel acoustics rather than formant trajectories. The hypothesis is tested on non-contemporaneous recordings of a custom-built challenging database of 26 young Australian female voices performing a map task. Evaluation with the log likelihood ratio cost validity metric Cllr shows that both trajectory and target perform well, but that contrary to phonological predictions, evidence based on monophthongal F-pattern trajectory is superior to target point measurements.",

keywords = "F-pattern, Forensic voice comparison, female voices, likelihood ratio, similar-sounding speakers",

author = "Phil Rose",

note = "Publisher Copyright: {\textcopyright} 2015 IEEE.; 40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015 ; Conference date: 19-04-2014 Through 24-04-2014",

year = "2015",

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doi = "10.1109/ICASSP.2015.7178886",

language = "English",

series = "ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings",

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Rose, P 2015, Forensic voice comparison with monophthongal formant trajectories - A likelihood ratio-based discrimination of 'schwa' vowel acoustics in a close social group of young Australian females. in 2015 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015 - Proceedings., 7178886, ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings, vol. 2015-August, Institute of Electrical and Electronics Engineers Inc., pp. 4819-4823, 40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015, Brisbane, Australia, 19/04/14. https://doi.org/10.1109/ICASSP.2015.7178886

Forensic voice comparison with monophthongal formant trajectories - A likelihood ratio-based discrimination of 'schwa' vowel acoustics in a close social group of young Australian females. / Rose, Phil.
2015 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2015. p. 4819-4823 7178886 (ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings; Vol. 2015-August).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AB - An experiment is described relating to estimation of strength of evidence in likelihood ratio-based forensic voice comparison. It is asked whether a better performance is obtained from point estimation of formant pattern targets in monophthongal vowel acoustics rather than formant trajectories. The hypothesis is tested on non-contemporaneous recordings of a custom-built challenging database of 26 young Australian female voices performing a map task. Evaluation with the log likelihood ratio cost validity metric Cllr shows that both trajectory and target perform well, but that contrary to phonological predictions, evidence based on monophthongal F-pattern trajectory is superior to target point measurements.

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KW - likelihood ratio

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Rose P. Forensic voice comparison with monophthongal formant trajectories - A likelihood ratio-based discrimination of 'schwa' vowel acoustics in a close social group of young Australian females. In 2015 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015 - Proceedings. Institute of Electrical and Electronics Engineers Inc. 2015. p. 4819-4823. 7178886. (ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings). doi: 10.1109/ICASSP.2015.7178886

Forensic voice comparison with monophthongal formant trajectories - A likelihood ratio-based discrimination of 'schwa' vowel acoustics in a close social group of young Australian females

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