tailieunhanh - Báo cáo hóa học: " Real-time detection of musical onsets with linear prediction and sinusoidal modeling"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Real-time detection of musical onsets with linear prediction and sinusoidal modeling | Glover et al. EURASIP Journal on Advances in Signal Processing 2011 2011 68 http content 2011 1 68 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Real-time detection of musical onsets with linear prediction and sinusoidal modeling John Glover Victor Lazzarini and Joseph Timoney Abstract Real-time musical note onset detection plays a vital role in many audio analysis processes such as score following beat detection and various sound synthesis by analysis methods. This article provides a review of some of the most commonly used techniques for real-time onset detection. We suggest ways to improve these techniques by incorporating linear prediction as well as presenting a novel algorithm for real-time onset detection using sinusoidal modelling. We provide comprehensive results for both the detection accuracy and the computational performance of all of the described techniques evaluated using Modal our new open source library for musical onset detection which comes with a free database of samples with hand-labelled note onsets. 1 Introduction Many real-time musical signal-processing applications depend on the temporal segmentation of the audio signal into discrete note events. Systems such as score followers 1 may use detected note events to interact directly with a live performer. Beat-synchronous analysis systems 2 3 group detected notes into beats where a beat is the dominant time unit or metric pulse of the music then use this knowledge to improve an underlying analysis process. In sound synthesis by analysis the choice of processing algorithm will often depend on the characteristics of the sound source. Spectral processing tools such as the Phase Vocoder 4 are a well-established means of time-stretching and pitch-shifting harmonic musical notes but they have well-documented weaknesses in dealing with noisy or transient signals 5 . For real-time applications of tools such as the Phase Vocoder it

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