Michael Carne

Australian National University | ANU · College of Asia & the Pacific

It has been argued in forensic science that the empirical validation of a forensic inference system or methodology should be performed by replicating the conditions of the case under investigation and using data relevant to the case. This study demonstrates that the above requirement for validation is also critical in forensic text comparison (FTC)...

This study compares score- and feature-based methods for estimating forensic likelihood ratios for text evidence. Three feature-based methods built on different Poisson-based models with logistic regression fusion are introduced and evaluated: a one-level Poisson model, a one-level zero-inflated Poisson model and a two-level Poisson-gamma model. Th...

Score- and feature-based methods are the two main ones for estimating a forensic likelihood ratio (LR) quantifying the strength of evidence. In this forensic text comparison (FTC) study, a score-based method using the Cosine distance is compared with a feature-based method built on a Poisson model with texts collected from 2,157 authors. Distance m...

The paper presents a preliminary investigation of the performance of acoustic-phonetic based forensic voice comparison features derived from tonal fundamental frequency (F0) trajectories parameterised over disyllabic words, rather than individual syllables as is typically done. Its aim was to see whether the disyllabic parameterisation led to any i...

Michael Carne; Juqiang Chen; Ellison Luk; Sydney Strangeways; Clara Stockigt; Robert Mailhammer; Mark Harvey. Arabana has a three-way rhotic phoneme contrast: /r/ (alveolar trill) vs /ɾ/ (alveolar tap) vs /ɻ/ (retroflex continuant). The rhotic contrasts are prosodically restricted in Arabana. The triple contrast only appears following the tonic vo...

This paper describes a likelihood ratio-based forensic voice comparison experiment in microphone versus mobile channel mismatched conditions using parametric representations of formant trajectories. Cubic polynomial coefficients of /ai/ from non-contemporaneous recordings of 30 Japanese male speakers are used to derive multivariate likelihood ratio...

The nature of intrinsic consonantal F0 perturbations on tonal F0 in Vietnamese is investigated. Mean F0 and duration data for five unstopped tones of a female native speaker of Vietnamese, controlling for the effect of a three-way contrastive difference in VOT between alveolar stops, is presented. It is shown that [t], and [d] produce expected pert...