REVERBERATION SUPPRESSION DEVICE AND METHOD, PROGRAM, AND RECORDING MEDIUM THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a reverberation suppression device capable of also suppressing an initial portion of reverberations in the room.SOLUTION: While using two power spectrums of a main power spectrum calculated from signals sound-gathered by a main microphone installed so as to improve sensitivity for a speaker direction and a delayed sub power spectrum calculated from signals sound-gathered by a sub microphone installed so as to reduce sensitivity for the speaker direction, a subtraction part calculates estimated power of direct sounds by subtracting a filtered signal that is obtained by multiplying the delayed sub power spectrum by a filter coefficient, from the main power spectrum. An adaptive algorithm part inputs the delayed sub power spectrum and the estimated power of the direct sounds and updates the filter coefficient so as to minimize the estimated power of the direct sounds, a frequency domain filter part outputs a filtered signal that is filtered by multiplying the delayed sub power spectrum by the filter coefficient, and a reverberation suppression gain calculation part inputs the main power spectrum and an error signal and calculates a reverberation suppression gain for suppressing reverberation sounds.