Ultrasonic Source Localization with a Beamformer Implemented on an FPGA Using a High-density Microphone Array

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dc.contributor.authorAntonsson, Daniel
dc.contributor.authorLi, Mengxuan
dc.contributor.departmentChalmers tekniska högskola / Institutionen för data- och informationsteknik (Chalmers)sv
dc.contributor.departmentChalmers University of Technology / Department of Computer Science and Engineering (Chalmers)en
dc.date.accessioned2019-07-03T14:46:18Z
dc.date.available2019-07-03T14:46:18Z
dc.date.issued2018
dc.description.abstractA system has been designed which uses a high-density MEMS microphone array and a beamforming algorithm implemented on an FPGA to perform real-time positioning of ultrasonic sources. The array consists of 48 microphones which is a limit derived from the latency of the system; if the latency were to increase further the system could no longer be said to operate in real time. The system calculates signal energy in front of the array and displays the energy on a heatmap which updates at a frequency of 5.2 Hz. It can locate near-monochromatic sources at 20 kHz and narrowband sources at 35 kHz. However, the ability of the system to locate these sources was proven to be unreliable due to a phenomenon called spatial aliasing which causes an ambiguous pattern in the heatmap. Very brief sounds could not be located by the system and the system is also easily disturbed by ambient noise, such as noise from conversations. It was concluded that the first step of any potential future development should be to completely revise the implementation of the beamforming algorithm in order to increase the amount of microphones that can be used and decrease the latency of the system.
dc.identifier.urihttps://hdl.handle.net/20.500.12380/255327
dc.language.isoeng
dc.setspec.uppsokTechnology
dc.subjectInformations- och kommunikationsteknik
dc.subjectData- och informationsvetenskap
dc.subjectInformation & Communication Technology
dc.subjectComputer and Information Science
dc.titleUltrasonic Source Localization with a Beamformer Implemented on an FPGA Using a High-density Microphone Array
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
dc.type.uppsokH
local.programmeEmbedded electronic system design (MPEES), MSc
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