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US 8,076,566 B2Granted
Beat extraction device and beat extraction method
AssigneeSony Corporation
InventorsKosei Yamashita, Yasushi Miyajima
Life of this patent
Estimating the term…
Abstract
Upon receiving a digital audio signal recorded in a .wav file, a beat extraction processing unit 12 extracts coarse beat position information from this digital audio signal and outputs the result as metadata recorded in an .mty file. In addition, a beat alignment processing unit 13 aligns beat information of the metadata recorded in the .mty file and outputs the result as metadata recorded in a .may file. Beats of a rhythm of music are extracted highly accurately while reproducing a music signal of a musical tune.
Claims16
A beat extracting device comprising:
- beat extraction processing means for extracting beat position information of a rhythm of a musical tune;
- and
- beat alignment processing means for generating beat period information using the beat position information extracted and obtained by the beat extraction processing means and for aligning beats of the beat position information extracted by the beat extraction processing means on the basis of the beat period information, wherein the beat alignment processing means defines a window width centered on a beat, said window width matches a beat period of the beat period information in terms of time and extracts only a beat existing within the window width.
A beat extracting method comprising:
- a beat extraction processing step of extracting beat position information of a rhythm of a musical tune;
- and
- a beat alignment processing step of generating beat period information using the beat position information extracted and obtained at the beat extraction processing step and of aligning beats of the beat position information extracted at the beat extraction processing step on the basis of the beat period information, wherein at the beat alignment processing step, a window width centered on a beat that matches a beat period of the beat period information in terms of time is defined and only a beat existing within the window width is extracted.
Dependencies are inferred from the claim text.