20. The method of claim 18 , wherein step (g) further comprises the steps of: a) estimating a mean of the super vector using the tied state labels of the training data by averaging over each tied state class; and b) estimating a global mean vector.
21. The method of claim 20 , wherein step (a) is determined using the mathematical equation: μ k = ∑ t = 1 N k ⁢ y k ⁡ ( t ) / N k wherein μ represents a global mean vector over a tied-state class k, y k (t) represents a super vector belonging to a tied-state, and N k represents a number of frames belonging to a class.