Improving beamforming by optimization of acoustic array microphone positions

Improving beamforming by optimization of acoustic array microphone positions

Malgoezar, A.M.N. (TU Delft Aircraft Noise and Climate Effects)
Snellen, M. (TU Delft Aircraft Noise and Climate Effects)
Sijtsma, P. (TU Delft Aircraft Noise and Climate Effects)
Simons, D.G. (TU Delft Aircraft Noise and Climate Effects)

2016

Assigning proper positions to microphones within arrays is essential in order to reduce or eliminate side- and grating lobes in 2D beamform images. In this paper an objective function is derived providing a measure for the presence of artificial sources. Using the global optimization method Differential Evolution an optimized microphone configuration is obtained by minimization of this objective function. Results show that optimizing the microphone locations can significantly enhance the array performance. In a large part of the scan region surrounding the true source location, no side- or grating lobes are present, meaning that the source can be unambiguously located. From the optimization it is also found that the optimized array configuration shows the microphones distributed at almost constant distance. A linear relation is found which shows that the distance decreases with increasing frequency. This knowledge is important information for the design of an optimal microphone configuration.

http://resolver.tudelft.nl/uuid:fbd90d16-483c-4d33-a0e0-29cafabc1a69

6th Berlin Beamforming Conference: Berlin, Germany

6th Berlin Beamforming Conference, 2016-02-29 → 2016-03-01, Humboldt-Universität, Erwin Schrödinger-Zentrum Adlershof, Berlin, Germany

Institutional Repository

conference paper

© 2016 A.M.N. Malgoezar, M. Snellen, P. Sijtsma, D.G. Simons