| 摘要 |
PROBLEM TO BE SOLVED: To suppress howling quickly.SOLUTION: A reverberation analysis unit 24A comprises: an analysis processing unit 34 for calculating the degree of reverberation dominance Gr(k, m) according to a ratio of the reverberation component of an observation signal x(t) for each frequency; a reverberation extraction unit 36 for generating a reverberation spectrum YR(k, m) by multiplying the spectrum X(k, m) of the observation signal x(t) by the degree of reverberation dominance Gr(k, m) of each frequency; and a frequency identification unit 38 for identifying a peak frequency of the reverberation spectrum YR(k, m) generated by the reverberation extraction unit 36 as a reverberation frequency FR(m). A band suppressing unit 22 suppresses a band component including the reverberation frequency FR(m) of the observation signal x(t). |
