Design of frequency-invariant uniform concentric circular arrays with first-order directional microphones

Wang, Jinfu; Yang, Feiran; Yan, Zhaoli; Yang, Jun

doi:10.1016/j.sigpro.2023.109330

Signal Processing

2024

DOI: 10.1016/j.sigpro.2023.109330

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Design of frequency-invariant uniform concentric circular arrays with first-order directional microphones

Jinfu Wang,

Feiran Yang,

Zhaoli Yan

et al.

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2024

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Cited by 3 publications

References 41 publications

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The principle underlying the wireless reference microphone enhancing noise reduction performance in multi-channel active noise control windows

Shen,

Ji,

Shi

et al. 2024

Mechanical Systems and Signal Processing

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The principle underlying the wireless reference microphone enhancing noise reduction performance in multi-channel active noise control windows

Shen,

Ji,

Shi

et al. 2024

Mechanical Systems and Signal Processing

View full text Add to dashboard Cite

A circular microphone array with virtual microphones based on acoustics-informed neural networks

Zhao,

2024

The Journal of the Acoustical Society of America

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Acoustic beamforming aims to focus acoustic signals to a specific direction and suppress undesirable interferences from other directions. Despite its flexibility and steerability, beamforming with circular microphone arrays suffers from significant performance degradation at frequencies corresponding to zeros of the Bessel functions. To conquer this constraint, baffled or concentric circular microphone arrays have been studied; however, the former need a bulky baffle that interferes with the original sound field, whereas the latter require more microphones that increase the complexity and cost, both of which are undesirable in practical applications. To tackle this challenge, this paper proposes a circular microphone array equipped with virtual microphones, which resolves the performance degradation commonly associated with circular microphone arrays without resorting to physical modifications. The sound pressures at the virtual microphones are predicted from those measured by the physical microphones based on an acoustics-informed neural network, and then the sound pressures measured by the physical microphones and those predicted at the virtual microphones are integrated to design the beamformer. Experimental results demonstrate that the proposed approach not only eliminates the performance degradation but also suppresses spatial aliasing at high frequencies, thereby underscoring its promising potential.

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Design of Robust Broadband Frequency-Invariant Broadside Beampatterns for the Differential Loudspeaker Array

Zhang,

Wei,

Zhu

2024

Applied Sciences

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The directional loudspeaker array has various applications due to its capability to direct sound generation towards the target listener and reduce noise pollution. Differential beamforming has recently been applied to the loudspeaker line array to produce a broadside frequency-invariant radiation pattern. However, the existing methods cannot achieve a compromise between robustness and broadband frequency-invariant beampattern preservation. This paper proposed a robust broadband differential beamforming design to allow the loudspeaker line array to radiate broadside frequency-invariant radiation patterns with robustness. Specifically, we propose a method to determine the ideal broadside differential beampattern by combining multiple criteria, namely null positions, maximizing the directivity factor, and achieving a desired beampattern with equal sidelobes. We derive the above ideal broadside differential beampattern into the target beampattern in the modal domain. We propose a robust modal matching method with Tikhonov regularization to optimize the loudspeaker weights in the modal domain. Simulations and experiments show improved frequency-invariant broadside beamforming over the 250–4k Hz frequency range compared with the existing modal matching and null-constrained methods.

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Design of frequency-invariant uniform concentric circular arrays with first-order directional microphones

Cited by 3 publications

References 41 publications

The principle underlying the wireless reference microphone enhancing noise reduction performance in multi-channel active noise control windows

The principle underlying the wireless reference microphone enhancing noise reduction performance in multi-channel active noise control windows

A circular microphone array with virtual microphones based on acoustics-informed neural networks

Design of Robust Broadband Frequency-Invariant Broadside Beampatterns for the Differential Loudspeaker Array

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