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Lagt út: 21.01.2014

Tórur Andreassen vart ph.d. við Syddansk Universitet

Tann 22. oktober 2013 vardi Tórur Andreassen av Argjum ph.d. ritgerð sína á Biologisk Institut, Syddansk Universitet. Verjan varð undir heitinum "A critical review of acoustic localization systems currently used in bioacoustics". Heiti á ritgerðini er "Ultrasonic Microphone Arrays for Bat Bioacoustics using Applied Open Source Solutions".

Vegleiðari og hjálparvegleiðari vóru ávikavist Annemarie Surlykke, professari á Biologisk Institut og John Hallam, professari á Maersk Mc-Kinney Moller Institute, bæði á Syddansk Universitet.

Opponentar til verjuna vóru Herbert Peremans frá University of Antwerpen og Lutz Wiegrebe frá Ludwig-Maximilians Universität Münich.

Í sambandi vð ph.d.arbeiðið eru tvær greinir útgivnar, samandráttir kunnu lesast her:

Ultrasonic recording system without intrinsic limits

Semi-automatic long-term acoustic surveying: A case study with bats

Eisini er ein enskur samandráttur av ritgerðini niðanfyri.

Les um Tórur Andreassen í Heilagrunninum.  

Abstract
Today, state-of-the-art bioacoustic research requires high-sample-rate, multi-channel, and often long-term recording systems. Commercial systems are very costly and sometimes do not satisfy the experimental parameters. This project proposes and demonstrates an ultrasonic recording system design that is arbitrarily scalable.

The system is modular and based on retail components and open source software/hardware. Each module has four microphones and modules can be combined to extend the coverage area, obtain higher spatial recording resolution and/or add recording redundancy. The system is designed to have no inherent scalability limits. We have named it mclurs.

We have deployed mclurs in six different test settings:
• A setup that tests the system’s ability to make medium-term recordings (1-2 minutes) with many microphones.
• mclurs did a 4-channel long-term ecological study of the local bat population at campus of University of Southern Denmark, which established the presence of two bat species that were
otherwise not known to occupy the area.
• The system was integrated in a mobile robot as an echolocating guidance sensor.
• One setup demonstrates full-spectrum transducer calibration.
• mclurs was applied to find echo profiles of various objects.
• The system has also been used to emit calibrated ultrasonic signals.

We have developed semi-automatic methods that can extract and, to some extent, classify recorded bat calls in huge datasets. In most respects this system’s hardware specification surpasses all competitors on the market at a quarter of the price. Tests demonstrate that large deployments are feasible and accurate ultrasonic measurements can be obtained. The system has proven its worth as a long-term bat survey platform.