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Speaker-individuality in Fujisaki model f0 features: implications for forensic voice comparison

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
  • Adrian Leemann
  • Hansjörg Mixdorff
  • Maria O'Reilly
  • Marie-José Kolly
  • Volker Dellwo
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<mark>Journal publication date</mark>2014
<mark>Journal</mark>International Journal of Speech, Language and the Law
Issue number2
Volume21
Number of pages28
Pages (from-to)343-370
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Fundamental frequency (f0) is a highly speaker-specific feature. Consequently, practitioners often use f0 information in forensic casework. Current research principally examines the use of long-term f0 statistics such as f0 means and standard deviations for forensic voice comparison. The present study investigates how short-term f0 features such as measured by the Fujisaki intonation model capture speaker-individuality. Based on data of a homogeneous group of Zurich German speakers, we conducted an experiment on a large corpus of read speech and on a subset of sentences that included speaking style variability (spontaneous vs. read). The latter is characteristic of forensic casework. Speakers demonstrated high between-speaker variability and low within-speaker variability across the two speaking styles for a number of f0 features. Given this evidence of speaker-individuality, we discuss Fujisaki f0 features’ potential for forensic voice comparison.