Application of the Mirror Source Method for Low Frequency Sound Prediction in Rectangular Rooms

Aretz, Marc; Dietrich, Pascal; Vorländer, Michael

doi:10.3813/aaa.918710

Cited by 27 publications

(31 citation statements)

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“…(4) are utilized. 98 A similar, but not as detailed, study was conducted earlier by Lam. 44 The main principle of the image-source method is to recursively apply the image-source solution, explained in Sec.…”

Section: A Image-source Methodsmentioning

confidence: 74%

Overview of geometrical room acoustic modeling techniques

Savioja¹,

Svensson

2015

The Journal of the Acoustical Society of America

256

190

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Computerized room acoustics modeling has been practiced for almost 50 years up to date. These modeling techniques play an important role in room acoustic design nowadays, often including auralization, but can also help in the construction of virtual environments for such applications as computer games, cognitive research, and training. This overview describes the main principles, landmarks in the development, and state-of-the-art for techniques that are based on geometrical acoustics principles. A focus is given to their capabilities to model the different aspects of sound propagation: specular vs diffuse reflections, and diffraction.

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Section: A Image-source Methodsmentioning

confidence: 74%

Overview of geometrical room acoustic modeling techniques

Savioja¹,

Svensson

2015

The Journal of the Acoustical Society of America

256

190

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“…Enclosures with such absorption properties are known in the literature as lightly damped rooms (Easwaran, Craggs, 1996b; Dance, Van Buuren, 2013). A method for finding an equation for the modal amplitude P m relies on suitable transformation of the wave equation (1). Firstly, multiply both sides of Eq.…”

Section: Modal Representation Of the Room Impulse Responsementioning

confidence: 99%

“…The diffusion-equation model (Xiang et al, 2009;Luizard et al, 2014) is an extension of the statistical theory to spatially varying reverberant sound fields and is based on the analogy of the sound energy density with a density of "sound particles" travelling along straight lines. The geometric acoustics methods are adequate for high sound frequencies and most systems for geometric modelling are based on the ray tracing method (Summers et al, 2005), the beam tracing algorithm (Funkhouser et al, 2004;Laine et al, 2009), the image source method (Dance et al, 1995;Lehmann, Johansson, 2009), or the mirror source method (Mechel, 2002;Aretz et al, 2014). The fact that geometric methods do not include directly wave phenomena such as interferences or diffraction is a considerable disadvantage.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Reverberant Properties of Enclosures via a Method Employing a Modal Representation of the Room Impulse Response

Meissner

2016

Archives of Acoustics

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A theoretical method has been presented to describe sound decay in enclosures and simulate the room impulse response (RIR) employed for prediction of the indoor reverberation characteristics. The method was based on a solution of wave equation with the form of a series whose time-decaying components represent responses of acoustic modes to an impulse sound source. For small sound absorption on room walls this solution was found by means of the method of variation of parameters. A decay function was computed via the time-reverse integration of the squared RIR. Computer simulations carried out for a rectangular enclosure have proved that the RIR function reproduces the structure of a sound field in the initial stage of sound decay sufficiently well. They have also shown that band-limitedness of the RIR has evident influence on the shape of the decay function and predicted decay times.

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“…A definite lowfrequency limit for applicability of IS cannot be given, as the errors made depend on many factors such as the room shape and the specific boundary conditions. In (Aretz et al, 2014) it is shown that the errors are usually below 1 dB when the frequency limit is chosen at the Schroeder frequency in its original definition of "ten modes within the average half-width"…”

Section: Simulation Of Large Spacesmentioning

confidence: 99%

Virtual Acoustics

Vorländer¹

2015

Archives of Acoustics

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Virtual Reality (VR) systems are used in engineering, architecture, design and in applications of biomedical research. The component of acoustics in such VR systems enables the creation of audio-visual stimuli for applications in room acoustics, building acoustics, automotive acoustics, environmental noise control, machinery noise control, and hearing research. The basis is an appropriate acoustic simulation and auralization technique together with signal processing tools. Auralization is based on time-domain modelling of the components of sound source characterization, sound propagation, and on spatial audio technology. Whether the virtual environment is considered sufficiently accurate or not, depends on many perceptual factors, and on the pre-conditioning and immersion of the user in the virtual environment. In this paper the processing steps for creation of Virtual Acoustic Environments and the achievable degree of realism are briefly reviewed. Applications are discussed in examples of room acoustics, archeological acoustics, aircraft noise, and audiology.

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Application of the Mirror Source Method for Low Frequency Sound Prediction in Rectangular Rooms

Cited by 27 publications

References 0 publications

Overview of geometrical room acoustic modeling techniques

Overview of geometrical room acoustic modeling techniques

Prediction of Reverberant Properties of Enclosures via a Method Employing a Modal Representation of the Room Impulse Response

Virtual Acoustics

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