Beamforming synthesis of binaural responses from computer simulations of acoustic spaces |
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Authors: | Poletti Mark A Svensson U Peter |
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Institution: | Industrial Research Limited, P.O. Box 31-310, Lower Hutt, Wellington 5040, New Zealand. m.poletti@irl.cri.nz |
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Abstract: | Auditorium designs can be evaluated prior to construction by numerical modeling of the design. High-accuracy numerical modeling produces the sound pressure on a rectangular grid, and subjective assessment of the design requires auralization of the sampled sound field at a desired listener position. This paper investigates the production of binaural outputs from the sound pressure at a selected number of grid points by using a least squares beam forming approach. Low-frequency axisymmetric emulations are derived by assuming a solid sphere model of the head, and a spherical array of 640 microphones is used to emulate ten measured head-related transfer function (HRTF) data sets from the CIPIC database for half the audio bandwidth. The spherical array can produce high-accuracy band-limited emulation of any human subject's measured HRTFs for a fixed listener position by using individual sets of beam forming impulse responses. |
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