| 摘要 |
PROBLEM TO BE SOLVED: To keep a high recognition rate even when comb noise is superposed on input voice. SOLUTION: A noise discriminating part 3 discriminates whether there is the comb noise in an input voice signal and outputs the discriminated result to a noise removing part 2. The noise removing part 2, in accordance with the discriminated result, when the comb noise is superposed on the input voice signal, removes the comb noise superposed by passing the input voice signal through a notch filter group. In such a manner, by preventing each phenome spectrum from shifting to the direction of the noise spectrum, the high recognition rate is maintained.
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