Author

Shaojie Chen

Publication Date

1997

Document Type

Dissertation/Thesis

First Advisor

Kuo, Sen M. (Sen-Maw)

Degree Name

M.S. (Master of Science)

Department

Department of Electrical Engineering

LCSH

Noise control

Abstract

Acoustic noise problems become more and more evident as increased numbers of large industrial equipment such as engines, blowers, fans, transformers, and compressors are being employed. Active noise control (ANC), in which additional secondary sources are used to cancel noise from the original primary source, has drawn considerable attention and shown significant promise. However, the performance of narrowband ANC systems is limited by out-of-band overshoot (one kind of the passband disturbance), which was first addressed in a 1991 study by Dennis Morgan. Although several methods for alleviating the out-of-band overshoot were presented in his study, practical limitations still remain. In this thesis, the out-of-band overshoot problem in narrowband ANC is comprehensively studied. One characteristic of the out-of-band overshoot, asymmetry, is analyzed from both mathematics and zero-pole placement theory points of view. An effective technique to eliminate the out-of-band overshoot, phase compensation, is presented. Computer simulations for verifying the theoretical results are also provided.

Comments

Includes bibliographical references (pages [80]-82)

Extent

x, 82 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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