Conveners
A12.12/A16.13 Diffuse Sound Fields and Reverberation: S088
- Albert Prinn (International Audio Laboratories Erlangen)
- Franz Zotter (University of Music and Performing Arts)
A12.12/A16.13 Diffuse Sound Fields and Reverberation: P466
- Franz Zotter (University of Music and Performing Arts)
- Albert Prinn (International Audio Laboratories Erlangen)
A12.12/A16.13 Diffuse Sound Fields and Reverberation: S347
- Franz Zotter (University of Music and Performing Arts)
- Albert Prinn (International Audio Laboratories Erlangen)
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Mélanie Nolan (Universidad Politécnica de Madrid)10/09/2026, 14:20A12 Numerical, Computational, and Theoretical Acoustics
The existence of a diffuse sound field is a fundamental assumption underlying sound absorption measurements in reverberation chambers. Despite decades of research, diffuseness remains complex and challenging to characterize quantitatively. This contribution discusses recent advances in sound field analysis, including array-based characterization techniques, which have substantially improved...
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Franz Zotter (University of Music and Performing Arts)10/09/2026, 14:40A12 Numerical, Computational, and Theoretical Acoustics
Reproducing surround audio via a horizontal ring of 3D point-source loudspeakers is termed 2.5D synthesis. Such layouts were recently proven incapable of producing spatially extended diffuse sound fields when fed with mutually uncorrelated signals. Could feeding the loudspeakers via 2.5D sound field synthesis help?We show that the horizontal ring layout of vertical line sources is the ideal 2D...
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Aron Karsai (Institute of Electronic Music and Acoustics)10/09/2026, 15:00A12 Numerical, Computational, and Theoretical Acoustics
The practices of measuring the impulse response (IR) of a room and obtaining the reverberation time (RT) are standardized in ISO 3382-2. It specifies the use of an approximately omnidirectional sound source and multiple microphone positions (and, where appropriate, multiple source positions) to obtain spatially averaged room acoustic parameters. The standard also specifies minimum distances...
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Roland Badeau (Télécom Paris)10/09/2026, 15:00A12 Numerical, Computational, and Theoretical Acoustics
The statistical wave field theory mathematically establishes the statistical laws of the solutions to the wave equation in a bounded domain. It provides the closed-form expressions of the power distribution and the correlations of the wave field jointly over time, frequency and space, which hold at high frequency and after many reflections, in terms of the geometry and the specific admittance...
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Marius Rodrigues (Télécom-Paris)10/09/2026, 15:00A12 Numerical, Computational, and Theoretical Acoustics
Dynamic room acoustic simulation aims to render the acoustic effects of an environment in real time while accounting for potentially moving sources and receivers. In this context, the efficient synthesis of the long-term room response, also known as late reverberation, remains challenging because of the intricate relationship between room geometry and acoustic behavior. This paper introduces...
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Alice Pain (STMS)10/09/2026, 15:20A12 Numerical, Computational, and Theoretical Acoustics
Late reverberation has long been assumed isotropic, i.e., showing a uniform distribution of energy over all angles of incidence. However, recent works leveraging Spherical Microphone Array (SMA) measurements and the associated spatial analysis tools have shown that the isotropy assumption is never perfectly realized. The extent and spatial characteristics of this phenomenon, and its dependence...
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Andor Fürjes (aQrate Acoustics Ltd.)10/09/2026, 15:40A12 Numerical, Computational, and Theoretical Acoustics
Applicability of statistical room acoustic equations always assumes a diffuse sound field and a non-modal frequency range. In real-world applications this assumption and limit is rather theoretical, but still, these equations are used and are working satisfactorily in most cases. The paper discusses results of experiments to see practical limits of applicability of statistical approximations...
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Albert Prinn (International Audio Laboratories Erlangen)10/09/2026, 16:00A12 Numerical, Computational, and Theoretical Acoustics
Absorption coefficient measurements of material samples in reverberation chambers depend on diffuse field theory. The diffuseness of a sound field depends on the geometry and sound absorption of a given chamber. In this numerical study, a spatially averaged intensity-based diffuse field index is computed as a function of random-incidence absorption coefficient and frequency in a 2D geometry,...
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Jonathan A. Hargreaves (Acoustics Innovation Institute)10/09/2026, 16:40A12 Numerical, Computational, and Theoretical Acoustics
The concept of a diffuse sound field is long established and oft assumed in room acoustics. Metrics to quantify the ‘diffuseness’ of a given sound field also exist, and include cross-correlations between spaced sensors, the ratio of intensity to potential energy, and isotropy. Nonetheless, recent research has shown that there remains knowledge gaps, notably around the relationships between...
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Giulia Fratoni (University of Bologna)10/09/2026, 17:00A12 Numerical, Computational, and Theoretical Acoustics
High-quality immersive listening experiences require an adequately diffuse sound field to ensure spatial uniformity and listener envelopment. However, in small and medium-sized rooms, acoustic conditions are often compromised by dominant modal behaviour, leading to pronounced spatial unevenness of the sound field. This study outlines an integrated design approach for optimising an existing...
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Cédric Van hoorickx (Eindhoven University of Technology)10/09/2026, 17:20A12 Numerical, Computational, and Theoretical Acoustics
In the mid-frequency range, the high modal density of flexible (vibro-)acoustic components makes deterministic methods computationally expensive, while small spatial variations in geometry, material properties, or boundary conditions may have a (random) wave scattering effect. An efficient statistical analysis approach is therefore required, and since spatial and frequency averaging are...
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Marco Berzborn (Eindhoven University of Technology)10/09/2026, 17:40A12 Numerical, Computational, and Theoretical Acoustics
The sound field in rooms with non-uniform distribution of absorption or coupled volumes is well known to be subject to distinctly anisotropic reverberation. This is often evident as a multi-exponential energy decay with distinct directional properties. In recent years, the directional energy decay curve has been proposed and applied to investigate and quantify such phenomena. However, it was...
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Sebastian Kraync (Saint-Gobain Austria GmbH)10/09/2026, 18:00A12 Numerical, Computational, and Theoretical Acoustics
Recently, complaints about room acoustics in Austrian sports halls have increased noticeably. This development can be traced back to a rising number of acceptance measurements and the simplified comparability with the specified reverberation time of the latest versions of the local standard (ÖNORM B 8115-3) and guideline (ÖISS RL10). Our measurements and those collected from partners show that...
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