tailieunhanh - Báo cáo hóa học: "Research Article A Computationally Efficient Method for Polyphonic Pitch Estimation"

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 A Computationally Efficient Method for Polyphonic Pitch Estimation | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 729494 11 pages doi 2009 729494 Research Article A Computationally Efficient Method for Polyphonic Pitch Estimation Ruohua Zhou 1 Joshua D. Reiss 1 Marco Mattavelli 2 and Giorgio Zoia2 3 1 Centre for Digital Music School of Electronic Engineering and Computer Science Queen Mary University of London Engineering Building Mile End Road London E14NS UK 2 Signal Processing Institute Swiss Federal Institute of Technology ELB-116 1015 Lausanne Switzerland 3Systems Department Creative Electronic Systems SA 1212 Gd-Lancy-Geneva Switzerland Correspondence should be addressed to Joshua D. Reiss Received 27 August 2008 Revised 2 February 2009 Accepted 27 May 2009 Recommended by Gregor Rozinaj This paper presents a computationally efficient method for polyphonic pitch estimation. The method employs the Fast Resonator Time-Frequency Image RTFI as the basic time-frequency analysis tool. The approach is composed of two main stages. First a preliminary pitch estimation is obtained by means of a simple peak-picking procedure in the pitch energy spectrum. Such spectrum is calculated from the original RTFI energy spectrum according to harmonic grouping principles. Then the incorrect estimations are removed according to spectral irregularity and knowledge of the harmonic structures of the music notes played on commonly used music instruments. The new approach is compared with a variety of other frame-based polyphonic pitch estimation methods and results demonstrate the high performance and computational efficiency of the approach. Copyright 2009 Ruohua Zhou et al. 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 Polyphonic pitch estimation plays an important role in music .