Beamforming synthesis of binaural responses from computer simulations of acoustic spaces.
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.
Poletti
Mark A
MA
Industrial Research Limited, P.O. Box 31-310, Lower Hutt, Wellington 5040, New Zealand. m.poletti@irl.cri.nz
Svensson
U Peter
UP
D000162:Acoustics; D000669:Amplifiers, Electronic; D003198:Computer Simulation; D006257:Head / Q000033:anatomy & histology; D006309:Hearing / Q000502:physiology*; D006801:Humans; D008962:Models, Theoretical; D011601:Psychophysics / Q000706:statistics & numerical data