| 摘要 |
<p>There is provided a known acoustic signal removal device which receives an acoustic signal as a mixture of a plurality of acoustic signals and can remove a known acoustic signal when the known acoustic signal similar to one of the acoustic signals is given. The known acoustic signal removal device converts an input mixed acoustic signal m(t) and a known acoustic signal b'(t) into an amplitude spectra M(omega, t) and B'(omega, t) in the respective time frequency areas and subtracts a component corresponding to the B'(omega, t) in the M(omega, t) so as to be removed, thereby obtaining an amplitude spectrum S(omega, t) after the removal. Here, the component corresponding to the B'(omega, t) in the M(omega, t) is deformed by various factors such as a positional shift by time, temporal change of frequency characteristic, and temporal change of the sound volume. Accordingly, they are corrected to obtain B(omega, t), which is subtracted. Lastly, by using the phase of the m(t) and S(omega, t), reverse conversion is performed in the temporal region so as to obtain an acoustic signal s(t) after a desired removal.</p> |
