Introduction to Onset Detection Functions HAO-HSUN LI 1/30

Onset Detection  Onset ◦The beginning of a musical note or other sound ◦The amplitude rises from zero to an initial peak  Onset Detection Function ◦Function peaks coincide with onsets ◦Various methods exist 2/30

Short-Time Fourier Transform 3/30

Onset Detection Function 4/30

Onset Detection Function 5/30

Onset Detection Function 6/30

Onset Detection Function 7/30

Onset Detection Function 8/30

Onset Detection Function  Weighted Phase Deviation ◦Considers magnitude and phase jointly ◦Significant improvement  Normalized Weighted Phase Deviation 9/30

Onset Detection Function 10/30

Onset Detection Function  Rectified Complex Domain ◦CD does not distinguish between increases and decreases in amplitude ◦Onsets versus offsets 11/30

Onset Detection Function 12/30

Onset Detection Function 13/30

References  Bello, J. P., Daudet, L., Abdallah, S., Duxbury, C., Davies, M., & Sandler, M. B. (2005). A tutorial on onset detection in music signals. Speech and Audio Processing, IEEE Transactions on, 13(5),  Dixon, S. (2006, September). Onset detection revisited. In Proceedings of the 9th International Conference on Digital Audio Effects (Vol. 120, pp ).  Hainsworth, S., & Macleod, M. (2003, September). Onset detection in musical audio signals. In Proc. Int. Computer Music Conference (pp ).  Brossier, P. M. (2006). Automatic annotation of musical audio for interactive applications (Doctoral dissertation). 14/30