Audio signal processing apparatus, audio signal processing method, audio signal processing program, and computer-readable recording medium

An audio signal processing method comprising:

• cutting out a plurality of audio signals corresponding to a plurality of channels by a time frame;
• calculating a correlation value between each of the audio signals of the channels included in a given time frame cut out by the cutout unit;
• calculating spectrum information indicative of a spectral characteristic of the audio signal of a given channel cut out by the cutout unit;
• calculating, based on the correlation value and the spectrum information, a coefficient to be multiplied by the audio signal of the given channel;
• multiplying the coefficient by the audio signal of the given channel;
• and
• assigning, to the channels excluding the given channel, a multiplied signal obtained at the multiplying.

A computer-readable recording medium that stores therein an audio signal processing program that causes a computer to execute:

• cutting out a plurality of audio signals corresponding to a plurality of channels by a time frame;
• calculating a correlation value between each of the audio signals of the channels included in a given time frame cut out by the cutout unit;
• calculating spectrum information indicative of a spectral characteristic of the audio signal of a given channel cut out by the cutout unit;
• calculating, based on the correlation value and the spectrum information, a coefficient to be multiplied by the audio signal of the given channel;
• multiplying the coefficient by the audio signal of the given channel;
• and
• assigning, to the channels excluding the given channel, a multiplied signal obtained at the multiplying.