A study of utilizing a handy 2-D microphone array for noise source localization based on the near-field acoustic holography

摘要

The use of handy 2-D microphone array is proposed. This handy array has 8 by 8 microphones, the size of 400mm square. The real-time measurement system has constructed which consists of this handy array, processing circuits and data acquisition system. This handy array can be moved easily around the objective sound source, so sound source can be localized by Nearfield Acoustic Holography (NAH) with this feature although only a small area of 2-D sound field can be acquired at once. The small measurement aperture, however, causes the truncated error around the edge of the aperture in NAH process. It makes the reconstructed image near the sound source undistinguished. In this report, the optimal shape of filter in spatial wave number domain for the handy array is investigated by simulation.