Technique for suppressing particular audio component

摘要

A coefficient train processing section (33), which sequentially generates per unit segment (Tu) a processing coefficient train (G(t)) for suppressing a target component of an audio signal (x), includes a basic coefficient train generation section (42) and coefficient train processing section (44). The basic coefficient train generation section (42) generates a basic coefficient train where basic coefficient values corresponding to frequencies within a particular frequency band range (B0) are each set at a suppression value ( ³ 0) that suppresses the audio signal while coefficient values corresponding to frequencies outside the particular frequency band range are each set at a pass value ( ³ 1) that maintains the audio signal. The coefficient train processing section (44) generates the processing coefficient train, per unit segment, by changing, to the pass value ( ³ 1), each of the coefficient values corresponding to frequencies other than the target component among the coefficient values corresponding to the frequencies within the particular frequency band range (B0).