KEYWORD EXTRACTION DEVICE, KEYWORD EXTRACTION METHOD, AND PROGRAM AND RECORDING MEDIUM THEREFOR

PROBLEM TO BE SOLVED: To extract an appropriate keyword from an input speech even when there is an error (pronunciation error) in the input speech. SOLUTION: The keyword extraction device is provided with: an A/D converter means 12 for converting an input speech signal to a digital signal; a speech recognition means 13 for obtaining a speech recognition result by using an acoustic model and a language model; a keyword extraction means 16 for extracting a keyword from the speech recognition result; a noise mixing means 21 for mixing noise to the digital signal; a noise mixing speech recognition means 22 in which a feature amount is extracted from the noise mixing digital signal, and a noise mixing speech recognition result is obtained by using the acoustic model and the language model; a noise mixing keyword extracting means 23 for extracting a keyword from the noise mixing speech recognition result; and a keyword unification output means 24 for unifying the keywords extracted by the keyword extracting means 16 and the noise mixing keyword extracting means 23. COPYRIGHT: (C)2009,JPO&INPIT