| 摘要 |
The present invention relates to an acoustic signal processing apparatus that suppresses auditory noise caused in a difference signal generated by acoustic signals of a plurality of channels, a processing method therefor, and a program. A difference spectrum calculation unit 320 calculates, as a difference spectrum, the absolute difference value between frequency spectra of the left and right channels sent from frequency spectrum generation units 311 and 312. A low-level band determination unit 330 determines a difference spectrum corresponding to a low-level band among difference spectra of all the frequency bands. A substitution spectrum generation unit 350 generates a substitution spectrum for which a difference spectrum is substituted, on the basis of the frequency spectrum of the left channel. A spectrum substitution unit 360 substitutes the difference spectrum corresponding to the low-level band for a substitution spectrum corresponding to the difference spectrum. An accompaniment signal generation unit 370 generates an accompaniment signal by converting a frequency spectrum sent from the spectrum substitution unit 360 into a time-domain signal.
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