Onset detection

librosa.onset contains functions for computing onset strength envelopes and estimating onset events from audio signals.

onset_detect	Locate note onset events by picking peaks in an onset strength envelope.
onset_strength	Compute a spectral flux onset strength envelope.
onset_strength_multi	Compute a spectral flux onset strength envelope across multiple channels.
onset_backtrack	Backtrack detected onset events to the nearest preceding local minimum of an energy function.