Scattering in Feedback Delay Networks

Schlecht, Sebastian J.; Habets, Emanuël A. P.

doi:10.1109/taslp.2020.3001395

Cited by 9 publications

(17 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Room acoustics simulations are often based on geometrical acoustics in the form of image-source models (ISMs) [17,18], ray tracing [19,20], radiosity [21], and radiance transfer [22]. Using statistical assumptions, even more com-putationally efficient reverberation algorithms like feedback delay networks (FDNs; [23]) can be applied for generating reverberated signals (e.g., [16,24]), which, however, lack in accurately modeling room geometry. In hybrid approaches, simplified statistical methods, which fulfill perceptual requirements for late reverberation, can be combined with more accurate geometrical acoustic models for early reflections.…”

Section: Introductionmentioning

confidence: 99%

Computationally-Efficient Simulation of Late Reverberation for Inhomogeneous Boundary Conditions and Coupled Rooms

Kirsch¹,

Wendt²,

Par³

et al. 2023

J. Audio Eng. Soc.

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Computationally-Efficient Simulation of Late Reverberation for Inhomogeneous Boundary Conditions and Coupled Rooms

Kirsch¹,

Wendt²,

Par³

et al. 2023

J. Audio Eng. Soc.

View full text Add to dashboard Cite

“…Recent research on FDNs has focused on mixing matrix design to increase echo density [5], modal analysis [6], [7], timevarying FDNs [8], allpass FDNs for colorless reverberation [9] and scattering FDNs for dense reverberation [10]. Grouping of delay lines to control direction-dependent energy decay, known as the Directional Feedback Delay Network, was proposed by Alary et al in [11].…”

Section: Introductionmentioning

confidence: 99%

“…Schlecht has proposed adding delays [5] and filters [10] to the feedback matrix in an FDN. This has the advantage of increasing the echo density of the RIR more quickly, leading to dense, rich-sounding reverberation.…”

Section: Introductionmentioning

confidence: 99%

Grouped Feedback Delay Networks With Frequency-Dependent Coupling

Das

Schlecht

Sena

2023

IEEE/ACM Trans. Audio Speech Lang. Process.

Self Cite

View full text Add to dashboard Cite

Feedback Delay Networks are one of the most popular and efficient means of generating artificial reverberation. Recently, we proposed the Grouped Feedback Delay Network (GFDN), which couples multiple FDNs while maintaining system stability. The GFDN can be used to model reverberation in coupled spaces that exhibit multi-stage decay. The block feedback matrix determines the inter-and intra-group coupling. In this article, we expand on the design of the block feedback matrix to include frequencydependent coupling among the various FDN groups. We show how paraunitary feedback matrices can be designed to emulate diffraction at the aperture connecting rooms. Several methods for the construction of nearly paraunitary matrices are investigated. The proposed method supports the efficient rendering of virtual acoustics for complex room topologies in games and XR applications.

show abstract

“…Room acoustics simulations are often based on geometric acoustics in the form of image source models (ISM) [14], [15], ray tracing [16], [17], radiosity [18] and radiance transfer [19]. Based on statistical assumptions, computationally highly efficient reverberation algorithms like feedback delay networks (FDN; [20]) can be applied for generating reverberated signals (e.g., [21], [22]). In hybrid approaches, simplified statistical methods, which fulfill perceptual requirements for late reverberation can be combined with more accurate geometric acoustic models for early reflections.…”

Section: Introductionmentioning

confidence: 99%

Computationally Efficient Spatial Rendering of Late Reverberation in Virtual Acoustic Environments

Kirsch

Poppitz

Wendt

et al. 2021

2021 Immersive and 3D Audio: From Architecture to Automotive (I3DA)

View full text Add to dashboard Cite

For 6-DOF (degrees of freedom) interactive virtual acoustic environments (VAEs), the spatial rendering of diffuse late reverberation in addition to early (specular) reflections is important. In the interest of computational efficiency, the acoustic simulation of the late reverberation can be simplified by using a limited number of spatially distributed virtual reverb sources (VRS) each radiating incoherent signals. A sufficient number of VRS is needed to approximate spatially anisotropic late reverberation, e.g., in a room with inhomogeneous distribution of absorption at the boundaries. Here, a highly efficient and perceptually plausible method to generate and spatially render late reverberation is suggested, extending the room acoustics simulator RAZR [Wendt et al., J. Audio Eng. Soc., 62, 11 (2014)]. The room dimensions and frequency-dependent absorption coefficients at the wall boundaries are used to determine the parameters of a physically-based feedback delay network (FDN) to generate the incoherent VRS signals. The VRS are spatially distributed around the listener with weighting factors representing the spatially subsampled distribution of absorption coefficients on the wall boundaries. The minimum number of VRS required to be perceptually distinguishable from the maximum (reference) number of 96 VRS was assessed in a listening test conducted with a spherical loudspeaker array within an anechoic room. For the resulting low numbers of VRS suited for spatial rendering, optimal physically-based parameter choices for the FDN are discussed.

show abstract

Scattering in Feedback Delay Networks

Cited by 9 publications

References 22 publications

Computationally-Efficient Simulation of Late Reverberation for Inhomogeneous Boundary Conditions and Coupled Rooms

Computationally-Efficient Simulation of Late Reverberation for Inhomogeneous Boundary Conditions and Coupled Rooms

Grouped Feedback Delay Networks With Frequency-Dependent Coupling

Computationally Efficient Spatial Rendering of Late Reverberation in Virtual Acoustic Environments

Contact Info

Product

Resources

About