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A case for formant analysis in forensic speaker identification

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Francis Nolan & Catalin Grigoras

Editorial: Equinox, International Journal of Speech Language and the Law, 12(2), p.31, 2005.


Views differ on the relative importance for forensic speaker identification
of different aspects of the speech signal. It is argued here that formants, whose frequencies
and dynamics are the product of the interaction of an individual vocal tract
with the idiosyncratic articulatory gestures needed to achieve linguistically agreed
targets, are so central to speaker identity that they must play a pivotal role in speaker
identification. As a practical demonstration a case is described in which F1, F2 analysis
of a vowel and F2 analysis of three diphthongs show a consistent separation between
two recordings, thus effectively eliminating a suspect from having made obscene telephone
calls. Subsequent additional analysis, based on the statistical distribution of
formant frequency estimates throughout the samples, confirms the distinctness of the
voice of the suspect and that of the obscene caller. The theoretical foundation for
several kinds of formant-based analysis is then discussed.

Cuvinte cheie: forensic audio