Patent ID: 7502737
Filing Date: 2009-03-10
Classification: G10L

Abstract:
1. A recognition system, comprising: a first speech recognizer to implement a first language model with an utterance from a user and to generate a first hypothesis; a confidence estimator to indicate a confidence score based on the first hypothesis, the confidence estimator being programmed with a threshold level; a second speech recognizer to implement a second language model with the utterance and to generate a second hypothesis, the second hypothesis being determinative of an outcome of the system when the confidence score is less than the threshold level; a word-spotting speech recognizer to identify a keyword comprised in the utterance and to generate a keyword hypothesis; and a word-spotting confidence estimator to indicate a word-spotting confidence score based on the keyword hypothesis, the word-spotting confidence estimator being programmed with a word-spotting threshold level and wherein when the word-spotting confidence score is less than the word-spotting threshold level, the system prompts the user to repeat the utterance.