Performance Analysis of MVDR Beamformer Applied on an End-fire Microphone Array Composed of Unidirectional Microphones

• Autorzy: Šarić Zoran , Subotić Miško , Bilibajkić Ružica , Barjaktarović Marko , Zdravković Nebojša

Identyfikatory

DOI

10.24425/aoa.2021.138154

• Języki publikacji: EN

Abstrakty

EN

Microphone array with minimum variance (MVDR) beamformer is a commonly used method for ambient noise suppression. Unfortunately, the performance of the MVDR beamformer is poor in a real reverberant room due to multipath wave propagation. To overcome this problem, we propose three improvements. Firstly, we propose end-fire microphone array that has been shown to have a better directivity index than the corresponding broadside microphone array. Secondly, we propose the use of unidirectional microphones instead of omnidirectional ones. Thirdly, we propose an adaptation of its adaptive algorithm during the pause of speech, which improves its robustness against the room reverberation and deviation from the optimal receiving direction. The performance of the proposed microphone array was theoretically analyzed using a diffuse noise model. Simulation analysis was performed for combined diffuse and coherent noise using the image model of the reverberant room. Real room tests were conducted using a four-microphone array placed in a small office room. The theoretical analysis and the real room tests showed that the proposed solution considerably improves speech quality.

Słowa kluczowe

EN

adaptive beamforming; ambient noise suppression; differential microphone array; end-fire microphone array; MVDR beamformer

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2021
• Tom: Vol. 46, No. 4
• Strony: 611--621
• Opis fizyczny: Bibliogr. 40 poz., rys., tab., wykr.

Twórcy

autor

Šarić Zoran

• Laboratory of Acoustics, Life Activities Advancement Center Serbia

• https://orcid.org/0000-0001-9964-9974

autor

Subotić Miško

• Laboratory of Acoustics, Life Activities Advancement Center Serbia;

autor

Bilibajkić Ružica

• Laboratory of Acoustics, Life Activities Advancement Center Serbia

autor

Barjaktarović Marko

• Faculty of Electrical Engineering, University of Belgrade Serbia

autor

Zdravković Nebojša

• Faculty of Medical Sciences, University of Kragujevac Serbia

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Uwagi

EN

This paper is a result of research funded by the Ministry of Education, Science and Technological Development of the Republic of Serbia