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Identifier 000368500
Title Transient Detection and Tempo Estimation in Polyphonic Music Signals
Alternative Title Ανίχνευση μεταβατικών φαινομένων και εκτίμηση ταχύτητας εκτέλεσης σε πολυφωνικά σήματα μουσικής
Author Τρύφου, Γεωργία Σπυρίδων
Thesis advisor Μουχτάρης, Αθανάσιος
Abstract Tempo estimation is a subject of intensive research in the field of Music Information Retrieval (MIR), as many applications demand the automatic induction of the tempo of musical excerpts. In such applications it is desired that correct tempo estimation would be available to the system at about the same time that the tempo is detected by a human listener. This is technically very difficult because the human listeners are able to use higher level context cues to conduct tempo detection. In fact, many algorithms proposed for tempo detection in the past require a long signal segment for reliable results in tempo estimation. This is clearly a problem in contents such as radio programs, where the rhythmic music content may alternate with, for example, speech segments. There is a wide range of literature methods related to the topic of tempo estimation. So far, tempo estimation systems follow a general scheme that consists of two main steps. In the first step, a feature list is created which is used in the second step in order to detect recurrences of certain events in it. Many different approaches have been proposed in the past for the implementation of the above stages. In this thesis, a new approach to the implementation of the first step is proposed, along with the addition of a final step that will enhance the whole tempo estimation procedure. The proposed method for the extraction of the feature list is based on transient detection. The term transient is used to describe these points in the time representation of the input signal where abrupt changes take place in its amplitude. The detection is conducted using Gammatone subspace analysis and Linear Prediction Error Filters (LPEFs). The transient detection function produced from this processing is further handled resulting to the necessary feature list. After the second step, where the feature list is fed as an input to a bank of comb filters resonators the application of a model that approximates the tempo perception by human listeners is proposed. The later will enhance the results of tempo estimation with perceptual information . The evaluation of the proposed system is done using accuracy measures and musical excerpts obtained from the ISMIR 2004 Tempo Induction Evaluation Exchange benchmark corpus, the first ever to conduct systematic comparison of tempo estimation systems. The results of the evaluation indicate the proposed method compares favorably with other, state-of-the-art tempo estimation methods, using only one frame of the musical excerpts when most of the literature methods demand the processing of the whole piece.
Language English
Subject Linear prediction
Music information retrieval
Transient events
Ανάκτηση μουσικής πληροφορίας
Γραμμική πρόβλεψη
Μεταβατικά φαινόμενα
Ταχύτητα εκτέλεσης
Issue date 2011-07-15
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Computer Science--Post-graduate theses
  Type of Work--Post-graduate theses
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