Patent ID: 7551742

Claim:
An acoustic signal-processing apparatus comprising: a band-dividing unit operable to divide an entering acoustic signal into divided components that belong to several frequency bands; an overtone-generating unit operable to generate, under predetermined conditions, one or more overtone components based on each of the divided components that belong to the several frequency bands; and a combining unit operable to combine the entering acoustic signal with the one or more overtone components generated by said overtone-generating unit, wherein the predetermined conditions include: a condition that a first maximum degree among one or more degrees of the one or more overtone components generated based on a component belonging to a first frequency band among the several frequency bands is not greater than a second maximum degree among one or more degrees of the one or more overtone components generated based on a component belonging to a second frequency band among the several frequency bands, the second frequency band being lower than the first frequency band; and a condition that a third maximum degree among one or more degrees of the one or more overtone components generated based on a component belonging to the highest frequency band among the several frequency bands is less than a fourth maximum degree among one or more degrees of the one or more overtone components generated based on a component belonging to the lowest frequency band among the several frequency bands.