A Broadband Beamformer Using Controllable Constraints and Minimum Variance

Sam Karimian-Azari, Jacob Benesty, Jesper Rindom Jensen, Mads Græsbøll Christensen

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Abstrakt

The minimum variance distortionless response (MVDR) and the linearly constrained minimum variance (LCMV) beamformers are two optimal approaches in the sense of noise reduction. The LCMV beamformer can also reject interferers using linear constraints at the expense of reducing the degree of freedom in a limited number of microphones. However, it may magnify noise that causes a lower output signal-to-noise ratio (SNR) than the MVDR beamformer. Contrarily, the MVDR beamformer suffers from interference in output. In this paper, we propose a controllable LCMV (C-LCMV) beamformer based on the principles of both the MVDR and LCMV beamformers. The C-LCMV approach can control a compromise between noise reduction and interference rejection. Simulation results show that the C-LCMV beamformer outperforms the MVDR beamformer in interference rejection, and the LCMV beamformer in background noise reduction.
OriginalsprogEngelsk
Titel2014 Proceedings of the 22nd European Signal Processing Conference (EUSIPCO 2014)
Antal sider5
ForlagIEEE
Publikationsdato2014
Sider666-670
ISBN (Trykt)9781479946037
StatusUdgivet - 2014
BegivenhedEuropean Signal Processing Conference (EUSIPCO) - Lisbon, Portugal
Varighed: 1 sep. 20145 sep. 2014

Konference

KonferenceEuropean Signal Processing Conference (EUSIPCO)
LandPortugal
ByLisbon
Periode01/09/201405/09/2014

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