Two-Stage Beamforming With Arbitrary Planar Arrays of Differential Microphone Array Units

Albertini, Davide; Bernardini, Alberto; Borra, Federico; Antonacci, Fabio; Sarti, Augusto

doi:10.1109/taslp.2022.3231719

Cited by 11 publications

(2 citation statements)

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“…According to the theory of differential microphone arrays (DMAs), in fact, differences between sensor signals are combined to approximate derivatives of the acoustic pressure of arbitrary order [3][4][5][6][7][8][9]. DMAs have become popular because they allow to design beamformers with nearly frequency-invariant responses with high directivity and have been successfully implemented using different array geometries, including linear [6,10], circular [8,11,12], or arbitrary planar geometries [13][14][15][16][17]. Moreover, several differential beamforming methods have been proposed that maximize different directivity or robustness metrics or attempt to match ideal directivity patterns [12,14,16].…”

Section: Introductionmentioning

confidence: 99%

“…DMAs have become popular because they allow to design beamformers with nearly frequency-invariant responses with high directivity and have been successfully implemented using different array geometries, including linear [6,10], circular [8,11,12], or arbitrary planar geometries [13][14][15][16][17]. Moreover, several differential beamforming methods have been proposed that maximize different directivity or robustness metrics or attempt to match ideal directivity patterns [12,14,16]. Although the literature on DMA is extensive and well established, microphone elements are usually assumed to have omnidirectional sensitivity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Steerable First-Order Differential Loudspeaker Arrays with Monopole and Dipole Elements

Miotello,

Bernardini,

Albertini

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Due to the recent trend toward miniaturization of acoustic transducers, differential loudspeaker arrays (DLA) of small size are becoming a popular approach to achieve directional sound radiation characterized by a near frequency invariant behavior. This makes DLAs suitable for broadband audio signal processing applications. So far, only arrays of omnidirectional loudspeakers have been used in the literature on DLAs. This work focuses on the design of steerable first-order DLAs characterized by a uniform linear geometry that alternates omnidirectional speakers with dipole speakers. The design is achieved by exploiting the theory of eigenbeams. First-order eigenbeam filters are formed and then combined to produce the desired steerable radiation response, making the implementation of the proposed beamformer very simple. Simulations show that the presented beamforming method is nearly frequency invariant for large frequency ranges. Moreover, we present an analysis of DLAs in terms of white noise gain and directivity index as the number of loudspeakers is varied.

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