| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy of speech recognition by appropriately removing a noise component included in a speech signal. SOLUTION: A speech recognition apparatus includes an adaptive filter for removing the noise component from the speech signal which is input from a microphone. An LMS learning section repeatedly learns a filter coefficient based on an LMS method (S220), and the filter coefficient obtained as the result of the learning is set to the adaptive filter (S230). When a learning prohibition instruction is input from a control section concurrently with the start of the speech recognition, learning of the filter coefficient is stopped. Thereafter, when the speech signal required for the speech recognition is given to the speech recognition section, the filter coefficient is learned and updated again, according to a learning resumption instruction which is input from the control section (S260). COPYRIGHT: (C)2009,JPO&INPIT
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