Patent ID: 8340322

Claim:
An acoustic processing device comprising: an input section to which audio signals of a plurality of channels respectively including in-phase components are input; a filtering section that makes a dip in each of the audio signals of the plurality of channels input to the input section in a range of 4 kHz to 8 kHz and outputs filtering-processed audio signals; a phase adjusting section that adjusts phases of the filtering-processed audio signals of the plurality of channels respectively received from the filtering section to generate phase adjustment signals of the plurality of channels being different in phase from the audio signals of the plurality of channels input to the input section; an anti-phase generating section that generates an anti-phase signal by adding the phase adjustment signals of the plurality of channels to each other and adjusting a phase of the added signal to a substantially inverted phase; and an output section that outputs signals obtained by adding, to each of the audio signals of the plurality of channels input to the input section, the phase adjustment signal of another channel and the anti-phase signal.