@ARTICLE{Šarić_Zoran_Performance_2021,
 author={Šarić, Zoran and Subotić, Miško and Bilibajkić, Ružica and Barjaktarović, Marko and Zdravković, Nebojša},
 volume={vol. 46},
 number={No 4},
 journal={Archives of Acoustics},
 pages={611-621},
 howpublished={online},
 year={2021},
 publisher={Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics},
 abstract={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.},
 type={Article},
 title={Performance Analysis of MVDR Beamformer Applied on an End-fire Microphone Array Composed of Unidirectional Microphones},
 URL={http://journals.pan.pl/Content/121814/PDF-MASTER/aoa.2021.138154.pdf},
 doi={10.24425/aoa.2021.138154},
 keywords={adaptive beamforming, ambient noise suppression, differential microphone array, end-fire microphone array, MVDR beamformer},
}