Agerkvist, Finn T.

Fernandez Grande, Efren

Jeong, Cheol-Ho

Tiana Roig, Elisabet

Torras Rosell, Antoni

Beamforming using uniform circular arrays of microphones can be used, e.g., for localization of environmental noise sources and for conferencing. The performance depends strongly on the characteristics of the array, for instance the number of transducers, the radius and whether the microphones are mounted on a scatterer such as a rigid cylinder or a sphere. The beamforming output improves with increasing frequency, up to a certain frequency where spatial aliasing occurs. At low frequencies the performance is limited by the radius of the array; in other words, given a certain number of microphones, an array with a larger radius will perform better than a smaller array. The aim of this study is to improve the performance of the array at low frequencies without modifying its physical characteristics. This is done by predicting the sound pressure at a virtual and larger concentric array. The propagation of the acoustic information captured by the microphones to the virtual array is based on acoustic holography. The predicted pressure is then used as input of the beamforming procedure. The combination of holography and beamforming for enhancing the beamforming output at low frequencies is examined with computer simulations and experimental results

Online Research Database In Technology

Towards an enhanced performance of uniform circular arrays at low frequencies - DTUOrbit (09/11/2017) Towards an enhanced performance of uniform circular arrays at low frequenciesBeamforming using uniform circular arrays of microphones can be used, e.g., for localization of environmental noisesources and for conferencing. The performance depends strongly on the characteristics of the array, for instance thenumber of transducers, the radius and whether the microphones are mounted on a scatterer such as a rigid cylinder or asphere. The beamforming output improves with increasing frequency, up to a certain frequency where spatial aliasingoccurs. At low frequencies the performance is limited by the radius of the array; in other words, given a certain number ofmicrophones, an array with a larger radius will perform better than a smaller array. The aim of this study is to improve theperformance of the array at low frequencies without modifying its physical characteristics. This is done by predicting thesound pressure at a virtual and larger concentric array. The propagation of the acoustic information captured by themicrophones to the virtual array is based on acoustic holography. The predicted pressure is then used as input of thebeamforming procedure. The combination of holography and beamforming for enhancing the beamforming output at lowfrequencies is examined with computer simulations and experimental results. General informationState: PublishedOrganisations: Department of Electrical Engineering, Acoustic TechnologyAuthors: Tiana Roig, E. (Intern), Torras Rosell, A. (Intern), Fernandez Grande, E. (Intern), Jeong, C. (Intern), Agerkvist, F.T. (Intern)Number of pages: 10Publication date: 2013 Host publication informationTitle of host publication: Proceedings of INTER-NOISE 2013Main Research Area: Technical/natural sciencesConference: INTER-NOISE 2013, Innsbruck, Austria, 15/09/2013 - 15/09/2013Uniform circular array, Beamforming, HolographyElectronic versions: Towards an enhanced performance of UCAs at low frequencies.pdf Source: dtuSource-ID: u::8792Publication: Research - peer-review › Article in proceedings – Annual report year: 2013 

Towards an enhanced performance of uniform circular arrays at low frequencies

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Towards an enhanced performance of uniform circular arrays at low frequencies

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