tailieunhanh - Báo cáo hóa học: " Research Article Wavelets in Recognition of Bird Sounds"

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 Wavelets in Recognition of Bird Sounds | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 51806 9 pages doi 2007 51806 Research Article Wavelets in Recognition of Bird Sounds Arja Selin Jari Turunen and Juha T. Tanttu Department of Information Technology Tampere University of Technology Pori . Box300 28101 Pori Finland Received 9 September 2005 Revised 30 May 2006 Accepted 22 June 2006 Recommended by Gerald Schuller This paper presents a novel method to recognize inharmonic and transient bird sounds efficiently. The recognition algorithm consists of feature extraction using wavelet decomposition and recognition using either supervised or unsupervised classifier. The proposed method was tested on sounds of eight bird species of which five species have inharmonic sounds and three reference species have harmonic sounds. Inharmonic sounds are not well matched to the conventional spectral analysis methods because the spectral domain does not include any visible trajectories that computer can track and identify. Thus the wavelet analysis was selected due to its ability to preserve both frequency and temporal information and its ability to analyze signals which contain discontinuities and sharp spikes. The shift invariant feature vectors calculated from the wavelet coefficients were used as inputs of two neural networks the unsupervised self-organizing map SOM and the supervised multilayer perceptron MLP . The results were encouraging the SOM network recognized 78 and the MLP network 96 of the test sounds correctly. Copyright 2007 Arja Selin 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 Nearly all birds make different kinds of sounds which are used in communication with other conspecifics and also between different species. Sounds are only produced when needed and