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• W1758271359 abstract "Coprime arrays represent a form of sparse sensing which can achieve narrow beams using relatively few elements, exceeding the spatial Nyquist sampling limit. The purpose of this paper is to expand on and experimentally validate coprime array theory in an acoustic implementation. Two nested sparse uniform linear subarrays with coprime number of elements ( M and N) each produce grating lobes that overlap with one another completely in just one direction. When the subarray outputs are combined it is possible to retain the shared beam while mostly canceling the other superfluous grating lobes. In this way a small number of microphones ( N+M-1) creates a narrow beam at higher frequencies, comparable to a densely populated uniform linear array of MN microphones. In this work beampatterns are simulated for a range of single frequencies, as well as bands of frequencies. Narrowband experimental beampatterns are shown to correspond with simulated results even at frequencies other than the arrays design frequency. Narrowband side lobe locations are shown to correspond to the theoretical values. Side lobes in the directional pattern are mitigated by increasing bandwidth of analyzed signals. Direction of arrival estimation is also implemented for two simultaneous noise sources in a free field condition." @default.
• W1758271359 created "2016-06-24" @default.
• W1758271359 creator A5023598657 @default.
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• W1758271359 date "2015-07-01" @default.
• W1758271359 modified "2023-09-25" @default.
• W1758271359 title "Broadband implementation of coprime linear microphone arrays for direction of arrival estimation" @default.
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• W1758271359 doi "https://doi.org/10.1121/1.4923159" @default.
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