Method and apparatus for tempo and downbeat detection and alteration of rhythm in a musical segment

摘要

An apparatus and method for determining the tempo and locating the downbeats of music encoded by an audio track performs a cross-correlation between a click track and a pulse track to indicate tempo candidates and between the click track and a series of pulses to determine downbeat candidates. The rhythm of the track is modified by altering segments located between the beats before playback. Swing is added by lengthening and shortening certain segments and the time-signature is modified by deleting certain segments.