| 摘要 |
PROBLEM TO BE SOLVED: To effectively adjust a reverberation component of a sound signal by simple processing.SOLUTION: A variable setting unit 42 sets a reverberation time T. A coefficient identification unit 44 identifies a smoothing coefficient α corresponding to the reverberation time T. An intensity average unit 46 calculates an average spectrum P(k) by an index moving average of a power spectrum P(k, m) of a sound signal x(n) to which the smoothing coefficient α identified by the coefficient identification unit 44 is applied. An adjustment value calculation unit 48 calculates an adjustment value G(k, m) for suppressing a reverberation component of the sound signal x(n) according to a ratio P(k, m)/P(k) of the power spectrum P(k, m) for the average spectrum P(k). The reverberation component is suppressed by making the adjustment value G(k, m) calculated by the adjustment value calculation unit 48 act on the sound signal x(n). |
