Low-cost Structural Health Monitoring System for Smart Buildings

Toscani, Andrea; Rocchi, Nicholas; Pinardi, Daniel; Binelli, Marco; Saccenti, Leonardo; Farina, Angelo; Pavoni, Stefano; Vanali, Marcello

doi:10.1109/smart55236.2022.9990379

Cited by 4 publications

(2 citation statements)

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“…A 3-dimensional modelling was used, discretized with a tetrahedral mesh, featuring six elements per wavelength, as suggested in [40]. Simulations were solved with a frequency resolution given by: 𝛥𝛥 𝑓𝑓 = 𝑓𝑓 𝑠𝑠 /𝑛𝑛 𝐹𝐹𝐹𝐹𝐹𝐹 (7) where 𝑓𝑓 𝑠𝑠 = 48 𝑘𝑘𝑘𝑘𝑘𝑘 is the standard sampling frequency in current audio applications [41] and 𝑛𝑛 𝐹𝐹𝐹𝐹𝐹𝐹 = 2 13 is the number of frequency beans chosen for the Fast Fourier Transform (FFT). Therefore, a frequency resolution of ∆ 𝑓𝑓 ≈ 5.86 𝑘𝑘𝑘𝑘 was employed.…”

Section: Numerical and Experimental Methodsmentioning

confidence: 99%

“…Indeed, they are used for dereverberation or echo reduction [1]- [4] and speech recognition [5]. Other applications include Active Noise Control (ANC) [6], [7], multi-channel audio recording [8], beamforming [9]- [11], acoustics simulations [12], and structural health monitoring [13]. Arrays of microphones also allow determining the Direction of Arrival (DoA) of sound [14], [15].…”

Section: Introductionmentioning

confidence: 99%

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Full-Digital Microphone Meta-Arrays for Consumer Electronics

Pinardi

Toscani

Binelli

et al. 2023

IEEE Trans. Consumer Electron.

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Microphone arrays of various sizes and shapes are widely employed in consumer electronics devices such as smart speakers, speakerphones, smart TVs, smartphones, PCs, and headphones. Therefore, the possibility of creating arrays of arrays (i.e., meta-arrays), by easily connecting several smaller units, is particularly interesting: it allows for different shapes, with an increased number of microphones and improved performance, while keeping costs low. In this paper, full-digital microphone meta-arrays are presented: they are constituted by an arrangement of several triangular units, each featuring four digital Micro Electro-Mechanical Systems (MEMS) capsules connected in daisy-chain through the Automotive Audio Bus (A 2 B). Two prototypes have been built: a planar meta-array made of seven triangles (28 capsules) and a 3-dimensional meta-array with 14 triangles (56 capsules). Numerical simulations were carried out and compared against experimental measurements performed on the prototypes, showing an excellent matching. Finally, the 3-dimensional meta-array was compared with a spherical microphone array widely considered the state-of-the-art equipment in the last decade, demonstrating its potential in telecommunication applications.

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Section: Numerical and Experimental Methodsmentioning

confidence: 99%