ESTIMATING A TEMPO METRIC FROM AN AUDIO BIT-STREAM

摘要

The invention relates to estimating tempo information directly from a bitstream encoding audio information, preferably music. Said tempo information is derived from at least one periodicity derived from a detection of at least two onsets included in the audio information. Such onsets are detected via a detection of long to short block transitions (in the bitstream) or/and via a detection of a changing bit allocation (change of cost) regarding encoding/transmitting the exponents of transform coefficients encoded in the bitstream.

主权项

1. A method for estimating a tempo metric related to an audio signal based on an encoded bit-stream representing the audio signal, wherein the bit-stream includes a plurality of audio blocks, the method comprising:
receiving the bit-stream; detecting transitions in block sizes of said audio blocks in the bit-stream; determining at least one periodicity related to a re-occurrence of said detected transitions; and determining an estimated tempo metric based on the determined periodicity.