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Monday, July 8 • 16:50 - 17:10
DIFFERENTIAL MICROPHONE ARRAY: DESIGN FOR ACOUSTIC LOCALIZATION WITHIN AIRCRAFT CABIN

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Acoustic localization inside aircraft cabins is of increasing interest. It allows to identify issues through sound measurements in a tight schedule, especially in an industrial context. Moreover, in such environments, the reverberant nature of the acoustic field and the space constraints make it difficult to use conventional localization method. For instance, beamforming among other localization techniques, requires large microphone arrays for applications to low- and mid-frequency range. This study combines the development of an array geometry and the definition of a post-processing method adapted to applications within aircraft. The research originality lies in the considered post-processing method, consisting in a subtractive array based on high-order differential microphones and exploiting acoustic gradient properties. With such a method, the use of a compact microphone array with a strong directivity in low frequencies is proposed. Precisely, a fourth-order analytical model is established, driven by the desired directivity and the sensitivity to noise, especially at low frequencies. The study aims at developing a compact array, allowing mainly localization from 500Hz up to 1000Hz, taking into account the space limitations. The frequency band target is used to drive the simulations and the antenna geometry definition. An experimental proof of concept is tested in an anechoic room. Simulations and experimental results are compared to an analytical modeling. Good agreement between them is observed. The comparison highlights the method advantages as well as the experimental limitations of the designed linear array. Then, a first localization test is performed using the experimental database. Finally, a modification of the post-processing method is suggested, with an improvement of the achieved directivity in the targeted low-frequency band.

Moderators
LH

Lars Håkansson

professor, Linnaeus University
TK

Triantafillos Koukoulas

Dr, Korea Research Institute of Standards and Science

Authors

Monday July 8, 2019 16:50 - 17:10 EDT
Westmount 2
  T01 Ac. meas. & instrum., RS02 Measur techniq & sens