DEVICE FOR THE ANALYSIS OF AN AUDIO SIGNAL WITH REGARD TO THE RHYTHM INFORMATION IN THE AUDIO SIGNAL USING AN AUTO-CORRELATION FUNCTION

摘要

A device for the analysis of an audio signal with regard to the rhythm information in the audio signal using an auto-correlation function, comprises a filter bank for splitting the audio signal into at least two partial-band signals. The partial band signals are analysed for periodicity by means of an auto-correlation function (106a), in order to obtain raw rhythm information for the at least two partial-band signals. The raw rhythm information is processed (121), to give processed raw rhythm information for the partial-band signal, in order to reduce or eliminate the ambiguity of the auto-correlation function for periodic signals. The rhythm information for the audio signal is determined (122) on the basis of the processed rhythm raw information. Auto-correlation function ambiguity is eliminated at the point of appearance, or rhythm components at double beat, not normally produced by an auto-correlation function processing are added by means of the auto-correlation function processing of partial bands, such that a more robust determination of the rhythm information in the audio signal results.