Differential Error Feedback Active Noise Control With the Auxiliary Filter Based Mapping Method

This letter proposes a differential error feedback active noise control (FBANC) system in an open end duct to mitigate interferences from its downstream. The interference waves entering the duct cause disturbance to the conventional FBANC controller and even result in divergence of the control filte...

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Bibliographic Details
Published in:IEEE signal processing letters 2022, Vol.29, p.573-577
Main Authors: Shi, Chuang, Du, Feiyu, Liu, Chunyu, Li, Huiyong
Format: Article
Language:English
Subjects:
Active noise control
auxiliary filter
Control systems
Delays
differential microphone array
Directivity
Ducts
Error feedback
Error signals
Interference
internal model control
Loudspeakers
Mapping
Microphone arrays
Microphones
Noise control
Noise reduction
Sound pressure
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Summary:This letter proposes a differential error feedback active noise control (FBANC) system in an open end duct to mitigate interferences from its downstream. The interference waves entering the duct cause disturbance to the conventional FBANC controller and even result in divergence of the control filter. This is due to the omni-directivity of the error microphone. The differential microphone array (DMA) can be constructed in a compact size using only one more omni-directional microphone. The DMA forms a frequency-invariant beampattern that presents configurable nulls. When the output of the DMA is used as the error signal, the null can be designed to enhance the robustness of the FBANC system against interferences. However, this differential error signal is converted from the sound pressure gradient instead of the sound pressure. The DMA's location does not precisely indicate the control point where optimum noise reduction has been achieved. To solve this problem, an auxiliary filter based mapping (AFMap) method is developed to map the differential error signal to the location of an omni-directional microphone in the DMA. Experiment results demonstrate that the proposed differential error FBANC system is much less sensitive to interferences than the conventional FBANC system, and the AFMap method can ensure optimum noise reduction occurring at the target control point.
ISSN:1070-9908
1558-2361
DOI:10.1109/LSP.2022.3144839