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Spectral flux is a measure of how quickly the power spectrum of a signal is changing, calculated by comparing the power spectrum for one frame against the power spectrum from the previous frame.
More precisely, it is usually calculated as the L2-norm between the two normalised spectra. Calculated this way, the spectral flux is not dependent upon overall power , nor on phase considerations.
The spectral flux can be used to determine the timbre of an audio signal, or in onset detection, among other things.
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