ACOUSTIC SIGNAL REMOVAL DEVICE, ACOUSTIC SIGNAL REMOVAL METHOD, AND ACOUSTIC SIGNAL REMOVAL PROGRAM

摘要

An acoustic signal removal device includes: an acoustic amplitude extraction unit for extracting a known acoustic amplitude spectrum from a known acoustic signal to be removed and extracting a mixed acoustic amplitude spectrum from the mixed acoustic signal; a removal strength setting unit for setting the removal strength of the known signal by assuming that a phase shift between the mixed acoustic signal and the known acoustic signal is distributed in the range of 0 to 360 degrees with a uniform probability; and a removal processing unit for converting the known acoustic amplitude spectrum according to the setting in the removal strength setting unit and removing the known acoustic amplitude spectrum from the mixed acoustic amplitude spectrum. The acoustic signal removal device can eliminate generation of sound volume discontinuity caused when removing the known acoustics from the mixed acoustics or erroneous processing attributed to the phase shift, automatically and accurately predict change of acoustics to be removed, and appropriately remove the acoustics.