Author

Pu Liu

Publication Date

1996

Document Type

Dissertation/Thesis

First Advisor

Kong, Xuan

Degree Name

M.S. (Master of Science)

Department

Department of Electrical Engineering

LCSH

Noise control

Abstract

In this thesis, we focus on a real-time implementation of multiple-channel active noise control algorithms for noise canceling in a large area. The algorithms considered include multiple-channel filtered-X least mean square (MFXLMS), multiple-channel feedback prediction filtered-X least mean square (MFBLMS), and multiple-channel hybrid filtered-X least mean square (MHFLMS). The first two algorithms are discussed in detail and the last algorithm will be introduced in this thesis. The MHFLMS algorithm, which basically is an integration of MFXLMS and MFBLMS algorithms, can cancel both narrowband and broadband noises. The broadband noises to be canceled must be correlated with the reference signal picked up by the reference sensors. But the narrowband noises to be canceled may not be correlated with the reference broadband noise signal. As shown by the results of computer simulations, MHFLMS algorithm can be very effective in certain complicated noise environment. In this research, firstly computer simulation was used to compare the performance of all three multiple-channel active noise control algorithms. Many noise models were considered in the simulation to fully explore variations of the algorithm performance under different conditions. Secondly, a real-time implementation, carried out under a laboratory environment, was used to evaluate the performance of the multiple-channel active noise control algorithms. The real-time implementation used a TMS320C31 Quad Processor Board from Spectrum Signal Processing Inc. Finally, extensive real-time field tests were conducted in a large manufacturing plant to demonstrate the applicability of the above algorithms to practical applications. Simulation and experiment results are presented and discussed in this thesis and future research directions are suggested.

Comments

Includes bibliographical references (pages [80]-81)

Extent

xi, 81 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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