Patent ID: 7216077
Filing Date: 2007-05-08
Classification: G10L

Abstract:
1. A method of providing speaker adaptation in speech recognition, said method comprising the steps of: providing at least one speech recognition model; accepting speaker data; generating a word lattice having a plurality of paths based on the speaker data, wherein the step of generating the word lattice comprises considering language model probabilities by incorporating the language model probabilities into a transition probability; and adapting at least one of the speaker data and the at least one speech recognition model with respect to the generated word lattice in a manner to maximize the likelihood of the speaker data, wherein said step of generating a word lattice comprises generating a maximum a-posteriori probability word lattice, wherein said step of generating a maximum a-posteriori probability word lattice comprises: wherein said step of determining posterior state occupancy probabilities for each state in the speaker data at each time comprises the use of the following formula: where α s t =P ( y 1 t , S t =s ) and for states s and a set of observations T, and where y t T represents T observation frames of adaptation data.