Using MMSE to improve session variability estimation

In this paper, the Session Variability Subspace Projection (SVSP) method based on model compensation for speaker verification was improved using the Minimum Mean Square Error (MMSE) criterion. The issue of SVSP is that the speaker’s session-independent supervector is approximated by the average of all his or her session-dependent GMM-supervectors when estimating SVSP matrix. However, the error between them does obviously exist. Our goal is to minimise it using MMSE criterion. Compared with the original SVSP, the proposed method could achieve an error rate reduction of 6.7% for EER and 5.3% for minimum detection cost function over the NIST SRE 2006 1C4W-dataset.