To remove reverberation with high accuracy even in a long reverberation time environment using only a small amount of data.
A rear part reverberation power estimating part 10c extracts a minimum value or a false minimum value of power (gain) of a sound signal as a power estimation value of rear part reverberative sound components, and a rear part reverberation removing part 10d uses the power estimation value of the rear part reverberative sound components, to calculate estimation values of the direct sound components and initial reverberative sound components of the reverberation signal. Then, a reverberation removing filter calculation part 10g calculates an estimated inverse filter using the estimation values of the direct sound components and the initial reverberative sound components as reference signals, and a reverberation removing filter multiplication part 10h multiplys the estimated inverse filter by the sound signal power to output an operation result.
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NAKATANI TOMOHIRO
MIYOSHI MASATO
Taku Kusano
Yukio Nakamura