Patent ID: 8515753

Claim:
An acoustic model adaptation method comprising: creating monophone-based acoustic models by using training data by a native speaker; expanding the monophone-based acoustic models to triphone-based acoustic models; performing a pronunciation variation analysis for examining a variation pronunciation of a non-native speaker through pronunciation analysis of a non-native speaker's speech by using the triphone-based acoustic models; and performing adaptation of an acoustic model by using the analyzed variation pronunciation so that the acoustic model may be adapted for the non-native speaker's speech, wherein the performing a pronunciation variation analysis includes, reducing a number of triphone-based acoustic models by using a state-tying scheme; creating a speech recognition system which has been trained by a native speaker's speech by increasing a mixture density of the state-tied triphone-based acoustic models; making the speech recognition system recognize a non-native speaker's speech, and then creating a monophone confusion matrix; and obtaining the variation pronunciation by analyzing the monophone confusion matrix.