| 摘要 |
PROBLEM TO BE SOLVED: To provide a noise reducing device which performs noise recognition processing in higher performance than before. SOLUTION: An input sound signal is converted to a frequency signal, and for each divided frequencies of the frequency signal, a polynomial for interpolating its sampling point is calculated. According to the polynomial, for example, amplitude change at time axis for each divided frequency, which is only discretely obtained, is continuously processed. based on comparison of a pattern (a coefficient pattern) by a coefficient of the polynomial, with a matching range corresponding to noise sound shown as the coefficient pattern, it is determined whether or not, there is noise. COPYRIGHT: (C)2011,JPO&INPIT
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