Date: 12-Jul-2007 From: Ulrich Lueders <lincom.europat-online.de> Subject: Forensic Speaker Identification: Alderman E-mail this message to a friend
Title: Forensic Speaker Identification
Subtitle: a Likelihood Ratio-based Approach Using Vowel Formants
Series Title: LINCOM Studies in Phonetics 01
Publisher: Lincom GmbH
Author: Tony G. Alderman
Paperback: ISBN: 3895867152 Pages: 160 Price: Europe EURO 57.00
Note: This is the second edition of a previously announced book.
This monograph describes an experiment in Forensic Speaker Identification, showing how speech samples from the same speaker can be discriminated from speech from different speakers with acoustic features commonly used in forensics. It also explains what is now considered the legally and logically correct approach to Forensic Speaker Identification, and presents data that can be used both in real casework and in further testing.
Forensic Speaker Identification is typically concerned with addressing the question of whether two or more speech samples have been produced by the same, or different, speakers. Research over the last decade has shown that the legally and logically correct way of doing this is by using a Bayesian Likelihood Ratio. The monograph explains what a Likelihood Ratio is; why its use is now considered correct; and how it can be used to successfully discriminate same-speaker pairs from different-speaker pairs. The tests are performed on data from eleven male speakers of Australian English, with non-contemporaneous samples, using formant values at target for their long monophthongal vowels. Likelihood Ratios are estimated using two formulae with different assumptions regarding the distribution of the reference data.
Reference data is also presented which is potentially useful for various permutations of the different-speaker hypothesis for male speakers of Australian English.
2nd printing 2007.