Dissertation/Thesis Abstract

Online Note Onset Detection for Piano Pieces
by Macias, Michael, M.S., The University of Mississippi, 2014, 55; 10185402
Abstract (Summary)

Many different onset detection methods have been proposed over time, but other than for non-pitched percussive sounds, such as drums, there does not exist a general method that correctly identifies onsets with high accuracy. In this thesis, the domain is limited to pitched percussive sounds, particularly piano pieces.

This thesis focuses on statistical-based onset detection models. When compared to probabilistic and learning-based models, they perform very well, are simpler, and run much faster since no training is involved, all of which are ideal for an online setting. These models have a common workflow of building a spectrogram, applying an onset detection function to create an activation curve, and using a peak picking algorithm to select candidate onsets.

Even though they do not directly improve performance, pilot studies on the main stages of onset detection are described. This includes using a variable framerate spectrogram, an onset detection function that makes use of harmonic information, and dynamic peak picking thresholding using Otsu's method. These approaches touch on areas where onset detection can be improved and should be further investigated.

Finally, a new method is proposed, combining many techniques shown to improve onset detection. This includes doubling the framerate of the spectrogram, preprocessing the spectrogram with a log-scale and adaptive magnitude, and widening the frame index difference. The preprocessed time-frequency representation, though more complex than previous algorithms, is effective, allowing the use of a simple onset detection function. This new method is able to outperform both original implementations and state-of-the-art statistical-based methods on a subset of the MIDI Aligned Piano Sounds dataset.

Indexing (document details)
Advisor: Xue, Jianxia
Commitee: Chen, Yixin, Wilkins, Dawn E.
School: The University of Mississippi
Department: Computer Science
School Location: United States -- Mississippi
Source: MAI 58/02M(E), Masters Abstracts International
Subjects: Computer science
Keywords: Onset detection, Piano
Publication Number: 10185402
ISBN: 9780438536678
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