Abstract
A real time, multi-function beat counting system used in machine perception of musical rhythms employs a high speed stable algorithm including down sampling and group summing of the original signal, pulse matching on peak points, and check-frame decision making. The down sampled and group summed signal is utilized to derive an onset peak train formed of a series of data points. The onset peak train is divided into frames, and a threshold value is determined for each frame. In each frame, peak profiles are determined, each comprising successive data points within the frame having values greater than the threshold value. Within each peak profile, a peak point is identified. An algorithm is employed to compare the onset peak train with a plurality of unit data pulse sequences having different periods, and a match is determined between the onset peak train and the closest one of the unit data pulse sequences to identify the period of the rhythm.
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