Broad spectrum diffusion model for room acoustics ray-tracing algorithms

Embrechts, Jean-Jacques

doi:10.1121/1.428489

Cited by 25 publications

(25 citation statements)

References 8 publications

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“…This expression can be extended for diffusely reflecting surfaces, applying the same method as in ref. [3], but this will not be shown here to avoid too long mathematical developments.…”

Section: Spl At the Spherical Receivermentioning

confidence: 99%

“…As explained in [3], this exact expression is approximated in the randomized sound rays algorithm by:…”

Section: Spl At the Spherical Receivermentioning

confidence: 99%

“…To compute the sound pressure levels (SPL) at a given location in the room, a receiving surface or a spherical receiver are defined at that particular location, with the function of collecting the sound rays' energy passing nearby and recording their time of arrival. Reference [3] recalls how this can be done in a formal way for a receiving surface. In this paper, spherical receiver will be used.…”

Section: Introductionmentioning

confidence: 99%

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Size-adaptive spherical receptor acceleration method for acoustical ray tracing

Lesoinne

Embrechts

2008

The Journal of the Acoustical Society of America

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Randomized ray tracing in room acoustics can be used to compute echograms, but the results computed at the receptor are affected by statistical errors [1]. To decrease these statistical errors, the usual solution is to increase the number of rays, but this also increases the computation time. Another solution is to increase the receptor size, but this lowers the spatial resolution of the computed sound field, which is particularly important for the early part of the echogram. In order to decrease the computation time and keep a sufficient resolution, the method proposed in this paper is based on a progressive modification of the receptor size (spherical type) as long as the ray's travel grows. At the same time, the number of rays into the room can be decreased as the sound ray lengths increase while keeping the statistical errors more or less constant. The consequence is that the sound field spatial resolution evolves from “precise” at the beginning of the echogram to “rough” at its end. The first applications of this new method show a significant gain of CPU time. [Broad spectrum diffusion model for room acoustics ray-tracing algorithms, J. J. Embrechts, Jnl. Acoust. Soc. Am. 107(4) 2068-2081 (2000)].

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“…This expression can be extended for diffusely reflecting surfaces, applying the same method as in ref. [3], but this will not be shown here to avoid too long mathematical developments.…”

Section: Spl At the Spherical Receivermentioning

confidence: 99%

“…As explained in [3], this exact expression is approximated in the randomized sound rays algorithm by:…”

Section: Spl At the Spherical Receivermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Size-adaptive spherical receptor acceleration method for acoustical ray tracing

Lesoinne

Embrechts

2008

The Journal of the Acoustical Society of America

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“…The RIRs were computed on the basis of directional echograms obtained with the broadband ray-tracing software Salrev [35]. In a first step, a simulation was carried out for a (8x10x3 m 3 ) room with an absorption coefficient equal to 0.036.…”

Section: Auditory Taskmentioning

confidence: 99%

Bimodal Interaction: The Role of Visual Information in Performing Acoustic Assessment in Architecture

Defays¹,

Safin²,

Billon³

et al. 2015

TOERGJ

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Abstract:In the framework of the design process of a multimodal 3D simulation environment to support architects' acoustic tasks, we wanted to gain a better understanding of how architects are able to discriminate the sounds using audio and/or visual inputs. This study explores how 2D pictures of rooms do support or impede the auditory evaluation of a space (specifically reverberation). The paper describes an experiment evaluating participants rankings of perceived acoustic reverberation when presented with congruent (coherent) or non-congruent (conflicting) evocative pictures of architectural spaces. We found that the congruent pictures had a positive impact on task performance while the noncongruent pictures had no significant effect. Moreover the effect of the expertise (professional background) of participants was investigated. We found differences between architects and non-architects in the way they performed the task, and they processed reverberation assessments. Taken together, the findings of this study contribute to the question of usefulness of expensive multimodal 3D simulation environment.

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“…Hence, it is essential to calculate the attenuation of road traffic noise caused by buildings, sound barriers and other obstacles. With the development of computer technology, mathematical simulations based on geometric acoustic methods, which include the ray tracing method (RTM), 6,7 beam tracing method (BTM), 8,9 image source method (ISM) 10,11 and comprehensive methods, 12 have been widely and practically applied in traffic noise simulation. BTM, as an extension of RTM, not only overcomes the weakness of only reflection calculation of ISM but also addresses the sampling errors that affect RTM 13 due to its spatial continuity.…”

Section: Introductionmentioning

confidence: 99%

Accuracy and efficiency analysis of a road traffic noise propagation calculation method based on beam tracing

Wang

Cai

2016

Journal of Low Frequency Noise, Vibration and Active Control

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The development and implementation of a traffic noise propagation calculation method based on beam tracing subordinated to spatial subdivision is presented to simulate noise attenuation in three-dimensional space. In the method, complex scenes constituted by road, different buildings and thin sound barrier and all noise propagation modes including direct, reflected, diffracted and composite are considered. The paper analyses the accuracy and efficiency of the method from the perspectives of subdivision precise of obstacles and road, beam thresholds and re-subdivision of sound barrier areas. The results presented by tendencies chart and formulas indicate that a meticulous subdivision and threshold settings lead to more accurate but less efficient method. Results of experiment and case study show the error to be no more than 0.3 dB when the building subdivision precisions (0.5 m), road subdivision precision (2 m) and thresholds (a length threshold of 500 m, three reflections and one diffraction) are set appropriately. Re-subdivision of sound barriers is presented to handle the trade-off between accuracy and efficiency caused by discrepancies in the geometric dimensions. In the case study, re-subdivision mitigates the trade-off between accuracy and efficiency, with almost the same accuracy by spending only approximately 1/10 of the time. A building subdivision precision of 1 m, a road subdivision precision of 2 m, a 500 m beam length, 3-5 reflections and a single diffraction are recommended for the method.

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Broad spectrum diffusion model for room acoustics ray-tracing algorithms

Cited by 25 publications

References 8 publications

Size-adaptive spherical receptor acceleration method for acoustical ray tracing

Size-adaptive spherical receptor acceleration method for acoustical ray tracing

Bimodal Interaction: The Role of Visual Information in Performing Acoustic Assessment in Architecture

Accuracy and efficiency analysis of a road traffic noise propagation calculation method based on beam tracing

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