Patent ID: 8731926

Claim:
A spoken term detection apparatus, comprising: a storage unit and a processor, wherein the storage unit includes an accumulation part to accumulate speech data of a retrieval target, an acoustic model storage section to store an acoustic model retaining a characteristic in an acoustic feature space for each unit of speech recognition, an acoustic feature storage to store an acoustic feature extracted from the speech data, and a standard score storage part to store a standard score calculated from a similarity between the acoustic feature and the acoustic model, wherein processing performed by the processor includes a feature extraction process to extract an acoustic feature from speech data accumulated in the accumulation part and store an extracted acoustic feature in the acoustic feature storage, a first calculation process to calculate the standard score from a similarity between an acoustic feature stored in the acoustic feature storage and an acoustic model stored in the acoustic model storage part, an acceptance process to accept an input keyword, a second calculation process to compare an acoustic model corresponding to an accepted keyword with the acoustic feature stored in the acoustic feature storage part to calculate a score of the keyword, and a retrieval process to retrieve speech data including the keyword from speech data accumulated in the accumulation part based on the score of the keyword calculated by the second calculation process and the standard score stored in the standard score storage part, wherein the standard score equates to the highest-likelihood phoneme series.