Dipole in Orthogonal Direction as a Secondary Source for Active Noise Control in Ducts

Authors: Prezelj, Jurij; Čudina, Mirko

Source: Acta Acustica united with Acustica, Volume 93, Number 1, January/February 2007 , pp. 63-72(10)

Buy & download fulltext article:

Price: $33.00 plus tax (Refund Policy)

Abstract:

An active noise control (ANC) method is particularly suitable for noise control in ventilation ducts. Usually a feed-forward configuration is used. Performance of a feed-forward ANC system in an air conditioning duct depends on the quality of the reference signal, which should be perfectly correlated with the primary noise. Acoustic feedback corrupts the reference signal and is one of the main problems of broadband feed-forward ANC systems in ducts. Directivity of the secondary source reduces the acoustic feedback effect. Two highly directional designs of the secondary source were developed: the Transmission Line (TL) secondary source and the Quarter Wavelength (QW) secondary source. It has been shown that this kind of acoustic feedback reduction unburdens the adaptive FX-LMS algorithm and speeds up its convergence. An additional advantage of both proposed secondary sources is that a significant transmission loss is achieved, even when the loudspeaker is turned off.

Document Type: Research article

Publication date: 2007-01-01

More about this publication?

Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
Editorial Board
Information for Authors
Subscribe to this Title
Information for Advertisers
Terms & Conditions
ingentaconnect is not responsible for the content or availability of external websites

Dipole in Orthogonal Direction as a Secondary Source for Active Noise Control in Ducts

Buy & download fulltext article:

Tools

Key

Text size:

Useful pages