Room Impulse Response Synthesis and Validation Using a Hybrid Acoustic Model

Southern, Alex; Siltanen, Samuel; Murphy, Damian; Savioja, Lauri

doi:10.1109/tasl.2013.2263139

Cited by 39 publications

(21 citation statements)

References 20 publications

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“…Other wave-based methods include boundary element [14] and finite element [15] methods, although FDTD is often preferred due to its ease of implementation and parallelization. Hybridizations of wave and geometric methods have also been studied [16], [17].…”

Section: Introductionmentioning

confidence: 99%

FDTD Methods for 3-D Room Acoustics Simulation With High-Order Accuracy in Space and Time

Hamilton

Bilbao

2017

IEEE/ACM Trans. Audio Speech Lang. Process.

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Section: Introductionmentioning

confidence: 99%

FDTD Methods for 3-D Room Acoustics Simulation With High-Order Accuracy in Space and Time

Hamilton

Bilbao

2017

IEEE/ACM Trans. Audio Speech Lang. Process.

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“…Diffraction can also be approximately modeled [Siltanen et al 2010b]. Hybrid solvers [Southern et al 2013] combine wave simulation at low frequencies with ART for diffusion/late reverberation and beam tracing for specular bounces. Such ideas are promising for extending our wave-based precomputation to higher frequencies.…”

Section: Related Workmentioning

confidence: 99%

Parametric wave field coding for precomputed sound propagation

Raghuvanshi

Snyder

2014

ACM Trans. Graph.

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Figure 1: Our wave coding transforms 7D pressure fields (dependent on source/listener location and time) generated by numerical wave simulation to timeinvariant 6D fields based on four perceptual parameters. Consistent with everyday experience, these parameters vary smoothly in space, aiding compression. Scene geometry ('Deck') is shown on the left, followed by a 2D slice of the parameter fields for a single source (blue dot). Direct sound loudness (L DS ) exhibits strong shadowing while early reflection loudness (L ER ) captures numerous scattered/diffracted paths, and consequently shadows less. Low L DS combined with high L ER conveys a distant and/or occluded source. Early decay time (T ER ) and late reverberation time (T LR ) together indicate scene size, reflectivity and openness. T LR is spatially smoother than T ER , being determined by many more weaker and higher-order paths in this complex space. AbstractThe acoustic wave field in a complex scene is a chaotic 7D function of time and the positions of source and listener, making it difficult to compress and interpolate. This hampers precomputed approaches which tabulate impulse responses (IRs) to allow immersive, real-time sound propagation in static scenes. We code the field of time-varying IRs in terms of a few perceptual parameters derived from the IR's energy decay. The resulting parameter fields are spatially smooth and compressed using a lossless scheme similar to PNG. We show that this encoding removes two of the seven dimensions, making it possible to handle large scenes such as entire game maps within 100MB of memory. Run-time decoding is fast, taking 100µs per source. We introduce an efficient and scalable method for convolutionally rendering acoustic parameters that generates artifact-free audio even for fast motion and sudden changes in reverberance. We demonstrate convincing spatially-varying effects in complex scenes including occlusion/obstruction and reverberation, in our system integrated with Unreal Engine 3 TM .

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“…In contrast, the physics-based methods, 3,4 which are able to inherently model the wave-related characteristics, are usually applied to the low-frequency component of RTF. Recent works 5 have attempted to build hybrid models via the combination of geometric model methods and physics-based methods in order to synthesize accurate RTF over the entire audible bandwidth and improve the computational efficiency. However, the attainable levels of model accuracy of the above methods excessively depend on the a priori knowledge about room geometry and reflection coefficients of wall covering.…”

Section: Introductionmentioning

confidence: 99%

Parameterization of the three-dimensional room transfer function in horizontal plane

Abhayapala

Bao

et al. 2015

The Journal of the Acoustical Society of America

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This letter proposes an efficient parameterization of the three-dimensional room transfer function (RTF) which is robust for the position variations of source and receiver in respective horizontal planes. Based on azimuth harmonic analysis, the proposed method exploits the underlying properties of the associated Legendre functions to remove a portion of the spherical harmonic coefficients of RTF which have no contribution in the horizontal plane. This reduction leads to a flexible measuring-point structure consisting of practical concentric circular arrays to extract horizontal plane RTF coefficients. The accuracy of the above parameterization is verified through numerical simulations.

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Room Impulse Response Synthesis and Validation Using a Hybrid Acoustic Model

Cited by 39 publications

References 20 publications

FDTD Methods for 3-D Room Acoustics Simulation With High-Order Accuracy in Space and Time

FDTD Methods for 3-D Room Acoustics Simulation With High-Order Accuracy in Space and Time

Parametric wave field coding for precomputed sound propagation

Parameterization of the three-dimensional room transfer function in horizontal plane

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