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Secondary channel estimation in spatial active noise control systems using a single moving higher order microphone.
Huiyuan Sun1, Naoki Murata2, Jihui Zhang1
1Audio & Acoustic Signal Processing Group, The Australian National University, Canberra, Australia.
The Journal of the Acoustical Society of America
|April 2, 2022
Summary
This study introduces a new method for spatial active noise control (ANC) that eliminates the need for an error microphone array during secondary channel estimation. A moving higher-order microphone is used instead, simplifying spatial ANC system implementation.
Area of Science:
- Acoustics
- Signal Processing
- Control Systems
Background:
- Spatial active noise control (ANC) aims to reduce noise in defined areas using secondary loudspeakers.
- Traditional ANC requires error microphones, which are impractical and obstructive.
- Existing virtual sensing methods still need microphone arrays for channel estimation.
Purpose of the Study:
- To propose a novel method for estimating secondary channels in spatial ANC without using an error microphone array.
- To enable more practical and user-friendly spatial ANC implementations.
Main Methods:
- Utilizing a moving higher-order microphone to capture secondary channel information.
- Estimating secondary channels from secondary loudspeakers to the region of interest, encompassing all potential error microphone locations.
Main Results:
- Simulations demonstrate the proposed method's robustness against measurement errors caused by microphone movement.
- The method effectively estimates secondary channels required for spatial ANC.
Conclusions:
- The proposed technique offers a viable alternative to error microphone arrays for secondary channel estimation in spatial ANC.
- This advancement facilitates the practical implementation of spatial ANC systems by removing geometric constraints.
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