Patent ID: 7446252

Claim:
A music information calculation apparatus comprising: an acoustic parameter calculation means for calculating, using the acoustic signal from an acoustic signal input means, a first acoustic parameter indicating a volume of the piece of music and a second acoustic parameter indicating a tone of the piece of music; an inflection degree calculation means for calculating, using the first acoustic parameter and the second acoustic parameter, an inflection degree indicating an inflection of the piece of music; a story node calculation means for calculating, using the first acoustic parameter, a story node representing a time at which a formation of the piece of music changes; and a story information calculation means for calculating, as story information indicating the formation of the piece of music, information representing a correspondence between the calculated story node and the calculated inflection degree obtained at the time represented by the calculated story node, wherein the first acoustic parameter indicates a short time power average value of the acoustic signal, wherein the second acoustic parameter indicates a zero cross value of the acoustic signal, and wherein the inflection degree calculation means calculates the inflection degree, using a product of the short time power average value and the zero cross value of the acoustic signal.