| 摘要 |
A noise removal unit 102 executes noise removal and flooring processing of an input signal, and a density calculating unit 104 calculates, as to a point of interest on a time-frequency plane of the input signal passing through the noise removal, a density of non-flooring processing points from the presence or absence of the flooring processing of individual points around the point of interest. A partial suppression unit 105 replaces, when the density is less than a threshold, the power of the point of interest with its flooring value by considering it as a musical noise component, thereby suppressing the musical noise component.
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