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Journal of Sensors
Volume 2016, Article ID 6276828, 9 pages
Research Article

Active Suppression of Narrowband Noise by Multiple Secondary Sources

Department of Embedded Systems Engineering, University of Incheon, 119 Academy-ro, Yeonsu-gu, Incheon 406-772, Republic of Korea

Received 19 March 2015; Revised 23 June 2015; Accepted 28 June 2015

Academic Editor: Marco Anisetti

Copyright © 2016 Seokhoon Ryu 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.


This study presents theoretical and experimental investigation on the active suppression of narrowband noise with C1, C1.5, and C2 components by using multichannel secondary sources in a duct. The quality manipulation in the duct was controlled by changing quality factors which were incorporated into a multichannel FxLMS algorithm. The algorithm is extensively investigated in both theory and real-time control experiment. After analysing the primary and secondary paths of the duct system, an acoustic narrowband signal was chosen as a primary noise and the impulse responses were implemented as the secondary path models. Control results show that the quality factors in the algorithm that was implemented in a dSPACE 1104 provide a stable and excellent response compared to before control. It is obvious that the lower quality factor cancels the more primary noise as defined in the theory although the attenuation levels are not exactly and inversely proportional to the quality factor. The results in this study can be used for practical active sound quality control systems.