Beat Histogram
A feature extractor that extracts the Beat Histogram from a signal. This is
histogram showing the strength of different rhythmic periodicities in a
signal.
This is calculated by taking the RMS of 256 windows and then taking
the FFT of the result.
IMPORTANT:
The window size of 256 RMS windows used here is hard-coded into the class
BeatHistogramLabels. Any changes to the window size in this class must be
made there as well.
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