| 摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic signal analysis device capable of detecting a transition of a beat point and a tempo in music with high accuracy.SOLUTION: An acoustic signal analysis device 10 includes: acoustic signal input means for inputting an acoustic signal representing music; feature quantity calculation means for calculating a first feature quantity representing a feature related to presence of a beat in each section of the music and a second feature quantity representing a feature related to a tempo; and estimation means for simultaneously estimating a transition of the beat point and the tempo in the music by selecting a probability model that a series of observation likelihood representing a probability that the first feature quantity and the second feature quantity are simultaneously observed in each section of the music satisfies a predetermined reference among a plurality of probability models described as a series of states q classified by a combination of a physical quantity related to the presence of the beat in each section of the music and a physical quantity related to the tempo. |
