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Fusing the electromagnetic articulograph, high-speed video cameras and a 16-channel microphone array for speech analysis

100%

Mik Ł. , Lorenc A. , Król D. , Wielgat R. , Święciński R. , Jędryka R.

Prototype measurement system for localization of partial discharges sources – microphone array

86%

Polak F. , Sikorski W. , Siodła K.

tom Vol. 13

209--219

This paper presents a prototype measurement system, that will be used for localization of acoustic emission sources originating from partial discharges (PD). It is based on sensor arrays technology and direction of arrival estimation algorithms. Acoustic signals will be received with a universal linear array (ULA) of sensors, wherein the sensory elements are microphones operating in the audible frequency range. For the estimation of the direction of arrival of these signals conventional beamforming algorithm is used which has also been described theoretically. Ultimately, the system will be used to determine the direction of arrival of the acoustic signal generated by the insulation defect, which is corona discharge.

A simulation of thinning of microphone array in near-field broadband beamformers

72%

Wielgus A. , Szlachetko B.

tom Vol. 32, nr 2

art. no. 2021204

This paper is devoted to the problem of designing an optimal microphone matrix. We define a criterion function where the performance of our matrix should be as close as possible to the desired one based on L2 norm. In the classical approach, increasing a size of the matrix is used to improve the system performance. However, in many cases it is not a good solution. In this paper we propose a solution based on thinning technique. We work with rectangular, equispaced microphone matrix and using metaheuristic approach called simulated annealing we optimise the set of active microphones (we switch off some of the microphones from the regular matrix). For illustrations, few numerical examples are solved. Comparing to the classical approach we show that thinning microphone matrix can significantly improve system performance.