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Improving source localisation with SODIX for a sparse microphone array

Oertwig, S. and Funke, S. and Siller, H. (2018) Improving source localisation with SODIX for a sparse microphone array. 7th Berlin Beamforming Conference (BeBeC), 5-6 March, 05.-06.06.2018, Berlin, Germany.

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Official URL: http://www.bebec.eu/Downloads/BeBeC2018/Papers/BeBeC-2018-S05.pdf

Abstract

SODIX is an acoustic source localisation method that is able to resolve the directivity of the sound sources. In this paper, SODIX is applied to array measurements with a full- scale turbofan engine. Two different microphone arrays were used: 1) a linear array near the engine that was relatively densely populated with a total number of 248 microphones, and 2) a sparse microphone array in the far-field with only 31 microphones covering an angular range from 10 to 160 degrees. The source localisation results obtained from the analysis of both arrays are compared and it will be shown, that also the sparse array yields very good results. One free parameter in the SODIX algorithm is a penalty function that sets a constraint on the directivities of the sources, i.e. the amplitude changes from a single source to different microphones. The influence of this penalty function on the quality of the results is investigated on the basis of the experimental data and synthetic data generated from a relatively simple engine noise model. A practical improvement for the setup of the sparse far-field microphone array is proposed for future measurements.

Item URL in elib:https://elib.dlr.de/125985/
Document Type:Conference or Workshop Item (Speech)
Additional Information:BeBeC-2018-S05
Title:Improving source localisation with SODIX for a sparse microphone array
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Oertwig, S.UNSPECIFIEDUNSPECIFIED
Funke, S.UNSPECIFIEDUNSPECIFIED
Siller, H.UNSPECIFIEDUNSPECIFIED
Date:2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:acoustic source localisation microphone array SODIX sparse array
Event Title:7th Berlin Beamforming Conference (BeBeC), 5-6 March
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:05.-06.06.2018
Organizer:GFaI
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Siller, Henri
Deposited On:21 Jan 2019 09:42
Last Modified:31 Jul 2019 20:23

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