ISCA Archive Interspeech 2008
ISCA Archive Interspeech 2008

Automatic-type calibration of traditionally derived likelihood ratios: forensic analysis of australian English /o/ formant trajectories

Geoffrey Stewart Morrison, Yuko Kinoshita

A traditional-style phonetic-acoustic forensic-speaker-recognition analysis was conducted on Australian English /o/ recordings. Different parametric curves were fitted to the formant trajectories of the vowel tokens, and cross-validated likelihood ratios were calculated using a single-stage generative multivariate kernel density formula. The outputs of different systems were compared using Cllr , a metric developed for automatic speaker recognition, and the cross-validated likelihood ratios were calibrated using a procedure developed for automatic speaker recognition. Calibration ameliorated some likelihood-ratio results which had offered strong support for a contrary-to-fact hypothesis.


doi: 10.21437/Interspeech.2008-431

Cite as: Morrison, G.S., Kinoshita, Y. (2008) Automatic-type calibration of traditionally derived likelihood ratios: forensic analysis of australian English /o/ formant trajectories. Proc. Interspeech 2008, 1501-1504, doi: 10.21437/Interspeech.2008-431

@inproceedings{morrison08_interspeech,
  author={Geoffrey Stewart Morrison and Yuko Kinoshita},
  title={{Automatic-type calibration of traditionally derived likelihood ratios: forensic analysis of australian English /o/ formant trajectories}},
  year=2008,
  booktitle={Proc. Interspeech 2008},
  pages={1501--1504},
  doi={10.21437/Interspeech.2008-431}
}