TAILIEUCHUNG - Báo cáo hóa học: " Research Article Template-Based Estimation of Time-Varying Tempo"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Template-Based Estimation of Time-Varying Tempo | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 67215 14 pages doi 2007 67215 Research Article Template-Based Estimation of Time-Varying Tempo Geoffroy Peeters IRCAM - Sound Analysis Synthesis Team CNRS - STMS 1 pl. Igor Stravinsky 75004 Paris France Received 1 December 2005 Revised 17 July 2006 Accepted 10 September 2006 Recommended by Masataka Goto We present a novel approach to automatic estimation of tempo over time. This method aims at detecting tempo at the tactus level for percussive and nonpercussive audio. The front-end of our system is based on a proposed reassigned spectral energy flux for the detection of musical events. The dominant periodicities of this flux are estimated by a proposed combination of discrete Fourier transform and frequency-mapped autocorrelation function. The most likely meter beat and tatum over time are then estimated jointly using proposed meter beat subdivision templates and a Viterbi decoding algorithm. The performances of our system have been evaluated on four different test sets among which three were used during the ISMIR 2004 tempo induction contest. The performances obtained are close to the best results of this contest. Copyright 2007 Geoffroy Peeters. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Tempo and beat are among the most important percepts of western music a time structured set of sound events . Given the inherent ambiguity of tempo due to the various possible interpretations of the metrical structure of a rhythm its automatic estimation remains a difficult task for a large variety of music genres. For this reason and given the number of potential applications it is still the subject of an increasing number of research. Western music notation represents musical events using

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