Unidirectional solutions for active noise control in ducts

Vesa Välimäki, Jari Kataja, Marko Antila

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

This paper reviews our recent work on active noise control (ANC) in air-conditioning ducts using unidi-rectional detectors. The system comprises of a feedforward FIR controller and a duct with a pair of reference microphones. This paper focuses on the design of a unidirectional reference detector that can be used for reducing the acoustic feedback. A microphone pair is used and the obtained two signals are filtered appropriately before summing them up. We discuss and compare design methods for digital filter structures whose task is to cancel the upstream going antinoise signal and at the same time amplify the downstream going noise signal. Design techniques are based on optimized fractional delay filters and a two-channel weighted least-squares method. A structure composed of a parallel connection of FIR filters, which we optimize using a weighted least-squares method, shows the best directivity properties among the cases considered in this study.
Original languageEnglish
Title of host publicationINTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise01
Pages1315-1320
Number of pages6
Publication statusPublished - 2001
MoE publication typeB3 Non-refereed article in conference proceedings
EventInter-Noise 2001 - Haag, Netherlands
Duration: 27 Aug 200130 Aug 2001

Conference

ConferenceInter-Noise 2001
CountryNetherlands
CityHaag
Period27/08/0130/08/01

Fingerprint

Active noise control
Ducts
Microphones
Air conditioning ducts
Detectors
FIR filters
Digital filters
Acoustics
Feedback
Controllers

Cite this

Välimäki, V., Kataja, J., & Antila, M. (2001). Unidirectional solutions for active noise control in ducts. In INTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise01 (pp. 1315-1320)
Välimäki, Vesa ; Kataja, Jari ; Antila, Marko. / Unidirectional solutions for active noise control in ducts. INTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise01. 2001. pp. 1315-1320
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Välimäki, V, Kataja, J & Antila, M 2001, Unidirectional solutions for active noise control in ducts. in INTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise01. pp. 1315-1320, Inter-Noise 2001, Haag, Netherlands, 27/08/01.

Unidirectional solutions for active noise control in ducts. / Välimäki, Vesa; Kataja, Jari; Antila, Marko.

INTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise01. 2001. p. 1315-1320.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

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AB - This paper reviews our recent work on active noise control (ANC) in air-conditioning ducts using unidi-rectional detectors. The system comprises of a feedforward FIR controller and a duct with a pair of reference microphones. This paper focuses on the design of a unidirectional reference detector that can be used for reducing the acoustic feedback. A microphone pair is used and the obtained two signals are filtered appropriately before summing them up. We discuss and compare design methods for digital filter structures whose task is to cancel the upstream going antinoise signal and at the same time amplify the downstream going noise signal. Design techniques are based on optimized fractional delay filters and a two-channel weighted least-squares method. A structure composed of a parallel connection of FIR filters, which we optimize using a weighted least-squares method, shows the best directivity properties among the cases considered in this study.

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Välimäki V, Kataja J, Antila M. Unidirectional solutions for active noise control in ducts. In INTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise01. 2001. p. 1315-1320