Multicondition training of Gaussian PLDA models in i-vector space for noise and reverberation robust speaker recognition

Abstract

We present a multicondition training strategy for Gaussian Probabilistic Linear Discriminant Analysis (PLDA) modeling of i-vector representations of speech utterances. The proposed approach uses a multicondition set to train a collection of individual subsystems that are tuned to specific conditions. A final verification score is obtained by combining the individual scores according to the posterior probability of each condition given the trial at hand. The performance of our approach is demonstrated on a subset of the interview data of NIST SRE 2010. Significant robustness to the adverse noise and reverberation conditions included in the multicondition training set are obtained. The system is also shown to generalize to unseen conditions.