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2021 | OriginalPaper | Chapter

Rotating Beamforming in the Frequency Domain for an Incomplete Microphone Array

Authors : Mengxuan Li, Wei Ma, Wei Zhou

Published in: Proceedings of the International Conference on Aerospace System Science and Engineering 2020

Publisher: Springer Singapore

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Abstract

As society developed expeditiously, more attentions have been paid towards harm of noise. Thus beamforming technology based on phased microphone array is widely used in rotating acoustic source localization. In this paper, a ring microphone array is placed parallel to the scanning plane with the array located on the z-axis. However, the microphone and the rotating part are not allowed to be too close for the potential suction danger caused by the rotating part. At present, this problem has not been solved in engineering.

This paper proposes a new method to measure the rotating parts safely by a ring microphone array with a large enough diameter. The diameter of the array is too large more than twice the distance from the array center to the ground. Hence, some microphones cannot be installed. In this paper, the symmetry of the ring array perpendicular to the ground is taken as the center. Moreover, an odd number reduces the number of microphones in turn. Then, the positions and levels of the maximum sound are compared with the previous case which does not reduce the microphones by observing the beamforming result.

When reducing the total number of microphones by less than a quarter, the resolution of the beamforming result decreases gradually while the maximum sound strength increases, and the position of the maximum sound pressure moves slightly. The deviation of the maximum acoustic pressure position can be ignored, and the change of the maximum sound pressure level is very small.

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Title: Rotating Beamforming in the Frequency Domain for an Incomplete Microphone Array
Authors: Mengxuan Li
Wei Ma
Wei Zhou
Publisher: Springer Singapore
Book: Proceedings of the International Conference on Aerospace System Science and Engineering 2020
Print ISBN: 978-981-336-059-4

Electronic ISBN: 978-981-336-060-0

Copyright Year: 2021
DOI: https://doi.org/10.1007/978-981-33-6060-0_25

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