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X-WR-CALNAME:EuroNoise 2015 Frequency Dependent Absorbing Boundary Implementations in 3D FDTD Room Acoustics Simulations
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CREATED:19700101T000000Z
UID:112
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SUMMARY:EuroNoise 2015 Frequency Dependent Absorbing Boundary Implementations in 3D FDTD Room Acoustics Simulations
DTSTART;TZID=Europe/Paris:20150601T114000
DTSTAMP:20150601T114000Z
SEQUENCE:1
DESCRIPTION: Stephen Oxnard --- Finite Difference Time Domain (FDTD) based simulation of acoustic wave \npropagation within a bounded space is commonly used in room acoustics \nmodelling research. Although accurate at low frequencies, full audio bandwidth \nsolutions remain computationally demanding despite significant efficiency \ngains based on GPU implementations. Acoustic boundary modelling has also \nreceived some considerable attention in the literature, with frequency \ndependent absorbing and diffusing boundary implementations based on a digital \nimpedance filter (DIF) FDTD grid termination demonstrating results closely \napproximating real-world materials. The DIF does, however, add complexity, \nboth in terms of the filter design process, normally based only on octave band \nabsorption coefficient data, and due to the required implementation, where \npotentially high-order DIFs are used. DIFs therefore add additional processing \nand memory loads to an already demanding algorithm, and require particular \nconsideration in optimised parallelisation schemes. This paper develops an \nalternative solution, recently proposed in the literature, where an efficient, \noctave-band, frequency independent boundary implementation is used. Results \nare computed simultaneously in parallel for each band and summed via a filter \nbank to arrive at a total response. This method is compared with the DIF \napproach based on the final impulse responses produced and the computational \nrequirements of both algorithms.\n
LOCATION:0.3 Copenhagen (49)
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