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One–dimensional active noise control in two directions

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An experimental study of a duct with active noise cancellation both "upstream" and "downstream" of a primary sound source is presented: this is an extension of the common single-channel installations, where sometimes a detrimental sound radiation from the upstream end occurs. The two adaptive feedforward systems, controlled by the filtered–X LMS algorithm, operate almost independently of each other. The duct section between the two secondary sources becomes an acoustical resonator with sound-soft reflection at both ends. Some passive absorption in the duct is advisable to avoid resonance overload of the active components.
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Document Type: Short Communication

Publication date: 1996-07-01

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  • 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.
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