tailieunhanh - Báo cáo hóa học: " Research Article Duct Modeling Using the Generalized RBF Neural Network for Active Cancellation of Variable Frequency Narrow Band Noise"

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 Duct Modeling Using the Generalized RBF Neural Network for Active Cancellation of Variable Frequency Narrow Band Noise | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 41679 7 pages doi 2007 41679 Research Article Duct Modeling Using the Generalized RBF Neural Network for Active Cancellation of Variable Frequency Narrow Band Noise Hadi Sadoghi Yazdi 1 Javad Haddadnia 1 and Mojtaba Lotfizad2 1 Engineering Department Tarbiat Moallem University ofSabzevar P. O. Box 397 Sabzevar Iran 2 Department of Electrical Engineering Tarbiat Modarres University . Box 14115-143 Tehran Iran Received 27 April 2005 Revised 1 February 2006 Accepted 30 April 2006 Recommended by Shoji Makino We have shown that duct modeling using the generalized RBF neural network DM_RBF which has the capability of modeling the nonlinear behavior can suppress a variable-frequency narrow band noise of a duct more efficiently than an FX-LMS algorithm. In our method DM-RBF at first the duct is identified using a generalized RBF network after that N stage of time delay of the input signal to the N generalized RBF network is applied then a linear combiner at their outputs makes an online identification of the nonlinear system. The weights of linear combiner are updated by the normalized LMS algorithm. We have showed that the proposed method is more than three times faster in comparison with the FX-LMS algorithm with 30 lower error. Also the DM_RBF method will converge in changing the input frequency while it makes the FX-LMS cause divergence. Copyright 2007 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION In the recent years acoustic noise canceling by active methods due to its numerous applications has been in the focus of interest of many researches. Contrary to the passive method it is possible using the active method to suppress or reduce the noise in a small space particularly in low frequencies below 500Hz 1 2 . Active noise control was introduced for the first time by Paul Lveg in 1936 for suppressing the noise in a duct 3 . In the .