Patent ID: 8566093

Claim:
A method for compensating intersession variability for automatic extraction of information from an input voice signal representing an utterance of a speaker, the method comprising: preprocessing the input voice signal to provide feature vectors that include acoustic features extracted from the input voice signal; computing an intersession variability compensation feature vector by: using a voice recording database including voice recordings of different speakers, computing an intersession variability subspace matrix that defines a transformation from an acoustic model space to an intersession variability subspace representing intersession variability for the speakers; computing, based on the input voice signal and the intersession variability subspace matrix, an intersession factor vector representing the intersession variability of the input voice signal in the intersession variability subspace; and computing the intersession variability compensation feature vector based on the intersession variability subspace matrix, the intersession factor vector, and a universal background model; and computing compensated feature vectors by subtracting the intersession variability compensation feature vector from the extracted feature vectors.