Microphone Based Acoustic Vector Sensor for Direction Finding with Bias Removal

• Autorzy: Wajid Mohd , Kumar Arun , Bahl Rajendar

Identyfikatory

DOI

10.24425/aoa.2022.141646

• Języki publikacji: EN

Abstrakty

EN

The acoustic vector sensor (AVS) is used to measure the acoustic intensity, which gives the direction-of-arrival (DOA) of an acoustic source. However, while estimating the DOA from the measured acoustic intensity the finite microphone separation (d) in a practical AVS causes angular bias. Also, in the presence of noise there exists a trade off between the bias (strictly increasing function of d) and variance (strictly decreasing function of d) of the DOA estimate. In this paper, we propose a novel method for mitigating the angular bias caused due to finite microphone separation in an AVS. We have reduced the variance by increasing the microphone separation and then removed the bias with the proposed bias model. Our approach employs the finite element method (FEM) and curves fitting to model the angular bias in terms of microphone separations and frequency of a narrowband signal. Further, the bias correction algorithm based on the intensity spectrum has been proposed to improve the DOA estimation accuracy of a broadband signal. Simulation results demonstrate that the proposed bias correction scheme significantly reduces the angular bias and improves the root mean square angular error (RMSAE) in the presence of noise. Experiments have been performed in an acoustic full anechoic room to corroborate the effect of microphone separation on DOA estimation and the efficacy of the bias correction method.

Słowa kluczowe

EN

acoustic measurements; acoustic sensor; acoustic vector sensor; direction-of-arrival estimation; finite element analysis; microphones; particle velocity; sound source localization

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2022
• Tom: Vol. 47, No. 2
• Strony: 151--167
• Opis fizyczny: Bibliogr. 40 poz., rys., tab., wykr.

Twórcy

autor

Wajid Mohd

• Department of Electronics Engineering, Z.H.C.E.T. Aligarh Muslim Univesity Aligarh, India
• Centre for Applied Research in Electronics, Indian Institute of Technology Delhi New Delhi, India

autor

Kumar Arun

• Centre for Applied Research in Electronics, Indian Institute of Technology Delhi New Delhi, India

autor

Bahl Rajendar

• Centre for Applied Research in Electronics, Indian Institute of Technology Delhi New Delhi, India

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