RECENT PROGRESS IN PROSODIC SPEAKER VERIFICATION

Speaker Verification

Presented by: Marcel Kockmann, Author(s): Marcel Kockmann, Brno University of Technology, Czech Republic; Luciana Ferrer, SRI International, United States; Lukas Burget, Brno University of Technology, Czech Republic; Elizabeth Shriberg, SRI International, United States; Jan Cernocky, Brno University of Technology, Czech Republic

We describe recent progress in the field of prosodic modeling for speaker verification. In a previous paper, we proposed a technique for modeling syllable-based prosodic features that uses a multinomial subspace model for feature extraction and within-class covariance normalization or linear discriminant analysis for session variability compensation. In this paper, we show that performance can be significantly improved with the use of probabilistic linear discriminant analysis (PLDA) for session variability compensation. This system does not require score normalization. We report an equal error rate below 7% on a NIST 2008 task. To our knowledge, this is the best reported result to date for a prosodic system for speaker recognition. Fusion of this system with a state-of-the-art acoustic baseline system yields 10% relative improvement in the new detection cost function (DCF) as defined by NIST.

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