Sixth European Conference on Speech Communication and Technology

Budapest, Hungary
September 5-9, 1999

Client / World Model Synchronous Alignement for Speaker Verification

Johnny Mariethoz (1), Dominique Genoud (1), Frédéric Bimbot (2), Chafic Mokbel (1)

(1) IDIAP, Martigny, Switzerland
(2) IRISA (CNRS & INRIA), Campus Universitaire de Beaulieu, Rennes, France

In speaker verification, two independent stochastic models, i.e. a client model and a non-client (world) model, are generally used to verify the claimed identity using a likelihood ratio score. This paper investigates a variant of this approach based on a common hidden process for both models. In this framework, both models share the same topology, which is conditioned by the underlying phonetic structure of the utterance. Then, two different output distributions are defined corresponding to the client vs. world hypotheses. Based on this idea, a synchronous decoding algorithm and the corresponding training algorithm are derived. Our first experiments on the SESP telephone database indicate a slight improvement with respect to a baseline system using independent alignments. Moreover, synchronousalignment offers a reduced complexity during the decoding process. Interesting perspectives can be expected.

Full Paper (PDF)

Bibliographic reference.  Mariethoz, Johnny / Genoud, Dominique / Bimbot, Frédéric / Mokbel, Chafic (1999): "Client / world model synchronous alignement for speaker verification", In EUROSPEECH'99, 1979-1982.