Construction of a Real-time High-precision Sound Field Auralization Platform

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This research investigates a real-time high precision sound field auralization platform through algorithm/architecture and software/hardware co-designs. During the first fiscal year, sound field in a room was accurately analyzed using numerical method. More details and research results are shown as follows.(1)wave-based algorithm to simulate room impulse response. The finite difference time domain (FDTD) method was focused on, and its schemes with different approximations in spatial and time domains were derived and analyzed. Their performances were compared, including hardware resource consumption, grid mesh dimensions, memory requirement, computing speed, and so on. An FPGA-based sound field renderer with the 2nd FDTD scheme was developed to simulate room impulse response, and it outperformed the software simulations carried out on a desktop machine with an Intel Xeon Gold 6212U 24-core processor even though it ran at about 350 MHz.(2)binaural rendering. Head related transformation functions were simulated to analyze the sound field around listener’s head, and their implementations using FPGA were investigated.(3)spatial decomposition of sound geometry. The spatial decomposition methods were studied to discretize a complex sound geometry.