The visualization of the sound field which is an invisible-physical phenomena is useful for detection of noise sources, understanding the sound propagation, and architectural acoustics. Room Impulse Response (RIR) is widely used in various acoustic applications because RIR characterizes the sound propagation between a source and a measurement point in a room. Thus, measuring the RIRs at multiple points allows us to visualize the sound field in more detail. For example, we can observe the animation of sound wave fronts by using the RIRs at multiple points. However, many microphones and repetitive measurements are required to measure the RIRs with high resolution. In this paper, we propose a method for visualization of the sound field with high spatial resolution based on the estimation of the RIRs around the microphone using a small number of microphones. The RIRs are modeled using sparse equivalent sources and the image source methods. We conducted the evaluation experiment in an anechoic chamber. By animating the RIRs estimated by three microphones, the sound wave fronts including direct sound and primary-reflection can be clearly observed.
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