Auralization of a Car Pass-By Using Impulse Responses Computed with a Wave-Based Method

Georgiou, Fotis; Hornikx, Maarten; Kohlrausch, AG Armin

doi:10.3813/aaa.919321

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…A different approach to the auralisation of a pass-by vehicle event is described by Georgiou et al [GHK19;Men+18]. In contrast to most realisations that employ GA models, binaural propagation Impulse Responses (IRs) at distinct locations sampled along a pre-determined trajectory were first measured and then simulated by a two-dimensional, pseudo-spectral, time-domain method for low frequencies.…”

Section: Simulation and Auralisationmentioning

confidence: 99%

Real-Time Auralisation of Outdoor Sound Propagation

Stienen¹

2023

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Auralisation describes the process of generating and presenting audible sound using computer programs and audio hardware. Since the result is perceived naturally by the human's auditory system, a demonstration by means of auralisation is easily comprehensible and does neither require background knowledge nor expertise. Producing auralisation under real-time constraints increases the implementation demands significantly. Real-time auralisation is required in applications that respond to user interaction, for example, in interactive Virtual Reality (VR) environments. Dynamically moving sound sources and receivers evoke a change in the perceived sound, and the corresponding result must be provided as quickly as possible. A feeling of immersion can be created if the response time of the system does not exceed perceptual thresholds and thus enables a plausible scene presentation. To achieve this emotional state, real-time auralisation must comply with the expected physical behavior. Because auralisation has gained much attention in room acoustics, the established concepts and approaches are insufficient, if applied to outdoor scenarios. This is due to the fact that simulation principles based on Geometrical Acoustics (GA) can determine specular sound reflection with ease, but only rudimentarily incorporate the contribution of diffracted sound. Nonetheless, the transmission of sound from a source to a receiver in an urban setting contains a significant contribution of reflected and diffracted components. Furthermore, highly dynamic virtual environments are time-variant. Traditional realisations neglect this characteristic, treating an acoustic environment as temporarily static on a frame-by-frame basis. Adaption to dynamic events is implemented by update routines performing sequences of time-invariant simulations, which is contradictory to the highly dynamic nature of outdoor scenarios. This misconception is addressed in this dissertation and an alternative solution is suggested. The realisation of a real-time auralisation application for outdoor environments represents a promising addition to current noise assessment procedures. It also delivers the foundation for auditory modality in VR regarding outdoor scenarios, serving as an audio-video tool for scientific investigations of urban sound environments, accounting for perceptual aspects. der PDs und die Zuordnung individueller Wellenfronten basiert auf einer Winkeldistanzmetrik ("k-means clustering") und die Korrektur der ITD berücksichtigt die Abweichungen im Azimut. Die Machbarkeit des vorgeschlagenen Echtzeit-Auralisierungssystems und die Eignung für die Schallausbreitung im Freien werden in einer interaktiven Applikation demonstriert, die auf VR-Technologien basiert.For the young who are inspiring me, the old who ground me and my dearest who holds everything together.

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Section: Simulation and Auralisationmentioning

confidence: 99%

Real-Time Auralisation of Outdoor Sound Propagation

Stienen¹

2023

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“…A poor synthesis reconstruction can drastically affect any perceptual cues from the audio and affects the sound quality assessments. Many attempts of the accurate synthesis of a traffic event have been proposed using simulation techniques such as time-domain finite differences [6], pseudo-spectral methods [7] and binaural impulse responses [8]. In the first two, the time-domain simulations are still rather simplistic and computationally expensive for realtime applications.…”

Section: Introductionmentioning

confidence: 99%

Real-time sound synthesis of pass-by noise: comparison of spherical harmonics and time-varying filters

et al. 2023

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This paper proposes and compares two sound synthesis techniques to render a moving source for a fixed receiver position based on indoor pass-by noise measurements. The approaches are based on the time-varying infinite impulse response (IIR) filtering and spherical harmonics (SH) representation. The central contribution of the work is a framework for realistic moving source sound synthesis based on transfer functions measured using static far-field microphone arrays. While the SHs require a circular microphone array and a free-field propagation (delay, geometric spread), the IIR filtering relies on far-field microphones that correspond to the propagation path of the moving source. Both frameworks aim to provide accurate sound pressure levels in the far-field that comply with standards. Moreover, the frameworks can be extended to additional sources and filters (e.g. sound barriers) to create different moving source scenarios by removing the room size constraint. The results of the two sound synthesis approaches are preliminary evaluated and compared on a vehicle pass-by noise dataset and it is shown that both approaches are capable of accurately and efficiently synthesize a moving source.

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