Patent ID: 8442241

Claim:
An audio signal processing device comprising: first and second orthogonal transform means for transforming two systems of input audio time-sequence signals into respective frequency region signals; frequency division spectral comparison means for comparing a level ratio or a level difference between corresponding frequency division spectrums from said first orthogonal transform means and said second orthogonal transform means; frequency division spectral control means made up of three or more sound source separating means for controlling a level of frequency division spectrums obtained from both or one of said first and second orthogonal transform means based on the comparison results at said frequency division spectral comparison means, so as to extract and output frequency band components of and nearby values regarding which said level ratio or said level difference have determined beforehand; three or more inverse orthogonal transform means for converting said frequency region signals from each of said three or more sound source separating means of said frequency division spectral control means into processed time-sequence signals; wherein output audio signals are obtained from each of said three or more inverse orthogonal transform means; and wherein said frequency division spectral comparison means calculate the level ratio or the level difference between corresponding frequency division spectrums from said first orthogonal transform means and said second orthogonal transform means, and also calculate a phase difference; and wherein said three or more sound source separating means of said frequency division spectral control means each have generating means for generating a first multiplier coefficient set as a function of said calculated level ratio or said calculated level difference and generating means for generating a second multiplier coefficient set as a function of said phase difference; said audio signal processing device comprising: first means for multiplying frequency division spectrums obtained from both or one of said first orthogonal transform means and said second orthogonal transform means with said fin multiplier function from said first multiplier coefficient generating means; and second means for multiplying the output of said first means with said second multiplier coefficient from said second multiplier coefficient generating means, thereby determining the output level thereof; wherein the output of said second means is input to said inverse orthogonal transform means.