Beat detection device, beat detection method, and beat detection program

摘要

PROBLEM TO BE SOLVED: To detect a correct beat even in a musical piece having no tempo fluctuation. SOLUTION: A CPU 2 calculates beat position information and BPM information of a music by an algorithm for calculating a beat position and BPM of a music having a tempo fluctuation, and based on the calculated BPM information, BPM. The beat time is calculated, the beat time between each beat is calculated based on the calculated beat position information, the beat time calculated based on the BPM information, and the beat calculated based on the beat position information. As a result of comparing with the time, when the matching section within the predetermined time range is equal to or more than the predetermined threshold, the beat position at the beginning of the matching section is used as a reference, and before and after the reference beat position, The beat position is defined by the calculated BPM inter-beat time interval, and the defined beat position information and the calculated BPM information are determined as the beat position and BPM of the music. [Selection diagram] Fig. 2