State transition model design method and voice recognition method and apparatus using same

An object of the invention is to provide a method of generating a state transition model capable of high speed voice recognition and to provide a voice recognition method and apparatus using the state transition model. To this end, a method is provided which generates a state transition model in which a state shared structure of the state transition model is designed, the method including a step of setting the states of a triphone state transition model in an acoustic space as initial clusters, a clustering step of generating a cluster containing the initial clusters by top-down clustering, a step of determining a state shared structure by assigning a short distance cluster among clusters generated by the clustering step, to the state transition model and a step of learning a state shared model by analyzing the states of the triphones in accordance with the determined state shared structure.