Empirical formulas for predicting the insertion loss behind wedges

Menounou, Penelope; Asimakopoulos, Vasileios

doi:10.1016/j.apacoust.2021.108166

Cited by 7 publications

(3 citation statements)

References 28 publications

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“…-35 dB in the shadowand view zone, and the average relative error is up to 0.67 dB in the view zone. The largest deviations are observed for virtual 1 To avoid potential singularity issues of BTMS [51] positions within 1.5° of the zone boundaries and of the extensions of the wedge planes were omitted. apex points outside the physical wedge, where the blending of two filters in UDFA deviates from the otherwise physicallybased design.…”

Section: Error and Computation Time Evaluationmentioning

confidence: 99%

“…HE wave properties of sound cause diffraction at edges and objects, with perceptually notable or specifically desired frequency-dependent attenuation, e.g., for sound barriers [1]. When the direct sound path is occluded, typically a low-pass characteristic is observed.…”

Section: Introductionmentioning

confidence: 99%

“…A considerably simpler empirical approximation for frequency-dependent attenuation of wide sound barriers was suggested in [38]. For the directive line source model [39], [40], empirical expressions 2 > REPLACE THIS LINE WITH YOUR MANUSCRIPT ID NUMBER (DOUBLE-CLICK HERE TO EDIT) < have been derived that are faster to calculate and can also represent absorbing wedges [1].…”

Section: Introductionmentioning

confidence: 99%

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A Universal Filter Approximation of Edge Diffraction for Geometrical Acoustics

Kirsch

Ewert

2023

IEEE/ACM Trans. Audio Speech Lang. Process.

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Sound propagation in urban and indoor environments often involves diffraction at corners, finite objects and openings, resulting in perceptually relevant frequencydependent attenuation. Geometrical acoustics (GA) have become a de-facto standard for prediction and simulation of sound propagation and real-time virtual acoustics, including effects of edge diffraction. However, methods to account for edge diffraction often assume infinite edges, such as the uniform theory of diffraction or are computationally involved, such as the Biot-Tolstoy-Medwin-Svensson (BTMS) method. Particularly for interactive auralization, an efficient approximation of edge diffraction is desirable. Here, an extension of GA to account for diffraction with simple-to-derive parameters and a time-domain recursive filter implementation is suggested. This universal diffraction filter approximation (UDFA) describes diffraction from infinite and finite wedges using a combination of first-order and (fractional) half-order low-pass filters to account for the frequency-dependent attenuation of the diffracted incident and reflected sound field. The physically-based UDFA exactly matches asymptotic solutions for infinite wedges and provides approximations for finite wedges. It is demonstrated that firstorder diffraction from flat finite objects like a plate or an aperture can be described by combining the filters for each edge. To account for effects of higher-order diffraction, an additional heuristic filter extension is suggested.

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Section: Error and Computation Time Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Universal Filter Approximation of Edge Diffraction for Geometrical Acoustics

Kirsch

Ewert

2023

IEEE/ACM Trans. Audio Speech Lang. Process.

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Green roofs as a nature-based solution for improving urban sustainability: Progress and perspectives

Mihalakakou

Souliotis

Papadaki

et al. 2023

Renewable and Sustainable Energy Reviews

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The prospect of using hollow pyramidal microwave absorbers for 5G anechoic chamber applications: A review

Abu Sanad,

Mahmud,

Ain

et al. 2024

Journal of Applied Physics

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Designing high-performance, wide bandwidth, lightweight, low-cost, and compact size absorbers for 5G anechoic chambers becomes essential. Several conventional absorbers, such as solid pyramidal absorbers, wedge absorbers, and convoluted absorbers, have shown acceptable absorption performance in a 5G mm-wave. However, these absorbers face challenges, such as narrow-angle of incidence, design complexity, and high cost. On the other hand, the hollow pyramidal absorber structures have a high level of freedom for optimization in order to be able to achieve the required specifications of 5G anechoic chambers. This paper provides an in-depth review of conventional absorber structures for use in anechoic chamber applications and their limitations for use in 5G applications, as well as the possibility of using hollow pyramidal absorbers in 5G anechoic chambers in comparison with conventional absorbers.

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Empirical formulas for predicting the insertion loss behind wedges

Cited by 7 publications

References 28 publications

A Universal Filter Approximation of Edge Diffraction for Geometrical Acoustics

A Universal Filter Approximation of Edge Diffraction for Geometrical Acoustics

Green roofs as a nature-based solution for improving urban sustainability: Progress and perspectives

The prospect of using hollow pyramidal microwave absorbers for 5G anechoic chamber applications: A review

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