tailieunhanh - Báo cáo hóa học: " An Automated Acoustic System to Monitor and Classify Birds"

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: An Automated Acoustic System to Monitor and Classify Birds | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 96706 Pages 1-19 DOI ASP 2006 96706 An Automated Acoustic System to Monitor and Classify Birds C. Kwan 1 K. C. Ho 2 G. Mei 1 Y. Li 2 Z. Ren 1 R. Xu 1 Y. Zhang 1 D. Lao 1 M. Stevenson 1 V. Stanford 3 and C. Rochet3 1 Intelligent Automation Inc. 15400 Calhoun Drive Suite 400 Rockville MD 20855 USA 2 Department of Electrical and Computer Engineering University of Missouri-Columbia 349 Engineering Building West Columbia MO 65211 UsA 3 National Institute of Standards and Technology Building 225 Room A216 Gaithersburg MD 20899 USA Received 4 May 2005 Revised 3 October 2005 Accepted 11 October 2005 Recommended for Publication by Hugo Van hamme This paper presents a novel bird monitoring and recognition system in noisy environments. The project objective is to avoid bird strikes to aircraft. First a cost-effective microphone dish concept microphone array with many concentric rings is presented that can provide directional and accurate acquisition of bird sounds and can simultaneously pick up bird sounds from different directions. Second direction-of-arrival DOA and beamforming algorithms have been developed for the circular array. Third an efficient recognition algorithm is proposed which uses Gaussian mixture models GMMs . The overall system is suitable for monitoring and recognition for a large number of birds. Fourth a hardware prototype has been built and initial experiments demonstrated that the array can acquire and classify birds accurately. Copyright 2006 C. Kwan 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 Collisions between aircraft and birds have become an increasing concern for both human and bird safety. More than four hundred people and over four hundred aircraft have