DEVICE, METHOD AND PROGRAM FOR REMOVING ACOUSTIC SIGNAL

摘要

PROBLEM TO BE SOLVED: To avoid derivation of discontinuity of sound volume and erroneous processing based on phase shift generated in the case of eliminating a known sound from mixed sound, to predict change of the sound which is going to be removed automatically and with high precision and to appropriately remove it. SOLUTION: The device for removing acoustic signal is provided with an acoustic amplitude extraction part which extracts a known acoustic amplitude spectrum from a known acoustic signal which is going to be removed and extracts a mixed acoustic amplitude spectrum from a mixed acoustic signal, a removal intensity setting part which sets removal intensity of the known signal by considering that the phase shift between the mixed acoustic signal and the known acoustic signal is distributed by uniform probability within a range of 0 to 360 degrees and a removal processing part which converts the known acoustic amplitude spectrum based on setting at the removal intensity setting part and removes the known acoustic amplitude spectrum from the mixed acoustic amplitude spectrum. COPYRIGHT: (C)2005,JPO&NCIPI