COMPLEXITY SCALABLE PERCEPTUAL TEMPO ESTIMATION Russian patent published in 2014 - IPC G10H1/40 

FIELD: information technology.

SUBSTANCE: method and system for extracting tempo information of an audio signal from an encoded bit stream of the audio signal comprising spectral band replication data are described. The method comprises steps of determining a payload quantity associated with the amount of spectral band replication data contained in the encoded bit stream for a time interval of the audio signal; repeating the determining step for successive time intervals of the encoded bit stream of the audio signal, thereby determining a sequence of payload quantities; identifying periodicity in the sequence of payload quantities; and extracting tempo information of the audio signal from the identified periodicity.

EFFECT: enabling tempo estimation, which is invariant to the type of codec or applicable to the musical genre of any kind.

22 cl, 4 tbl, 13 dwg