International Audio Laboratories Erlangen

Common Annotation Errors

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This page highlights common annotation errors and explains how we resolved them using Sonic Visualiser.

Missing note events/onsets

• Instruments with soft onsets often result in missing note events
• Delete the note event
• Redraw the tne note events and align them to the waveform

Two undetected onsets

Correctly annotated note events

Octave errors

• Especially at note beginnings, the F0 might be off by an octave (e.g., stemming from onset noises)
• We typically correct the annoation by adding a "Melodic Range Spectrogram" and set the scale to dB^2
• First, remove the wrong F0 trajectory
• Second, redraw the trajectory by following the peaks in the spectrogram

Octave error at the beginning of a note

Correctly annotated F0 trajectory on Melodic Range spectrogram