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 language | English |
|---|---|
| Title of host publication | INTER-NOISE and NOISE-CON Congress and Conference Proceedings, InterNoise01 |
| Pages | 1315-1320 |
| Number of pages | 6 |
| Publication status | Published - 2001 |
| MoE publication type | B3 Non-refereed article in conference proceedings |
| Event | Inter-Noise 2001 - Haag, Netherlands Duration: 27 Aug 2001 → 30 Aug 2001 |
Conference
| Conference | Inter-Noise 2001 |
|---|---|
| Country | Netherlands |
| City | Haag |
| Period | 27/08/01 → 30/08/01 |
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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)