Music – Instruments – Electrical musical tone generation
Reexamination Certificate
2006-03-14
2006-03-14
Fletcher, Marlon T (Department: 2837)
Music
Instruments
Electrical musical tone generation
C084S635000, C084S651000, C084S667000
Reexamination Certificate
active
07012183
ABSTRACT:
An apparatus for analyzing an audio signal with regard to rhythm information of the audio signal by using an autocorrelation function comprises a filter bank for separating the audio signal into at least two sub-band signals. The sub-band signals are examined with regard to periodicities by an autocorrelation function, to obtain rhythm raw-information for the at least two sub-band signals. To reduce or eliminate the ambiguities of the autocorrelation function for periodical signals, the rhythm raw-information is postprocessed to obtain post-processed rhythm raw-information for the sub-band signal. The rhythm information of the audio signal is established based on the postprocessed rhythm raw-information. By the sub-band-wise ACF postprocessing, ACF ambiguities are already eliminated where they originate, and rhythm portions are added at double tempi, which an autocorrelation function processing does normally not provide, so that, as a result, a more robust determination of the rhythm information of the audio signal arises.
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Cremer Markus
Herre Jürgen
Rohden Jan
Uhle Christian
Fletcher Marlon T
Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung
Greenberg Laurence A.
Locher Ralph E.
Stemer Werner H.
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