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JRM Vol.29 No.1 pp. 224-235
doi: 10.20965/jrm.2017.p0224
(2017)

Paper:

Acoustic Monitoring of the Great Reed Warbler Using Multiple Microphone Arrays and Robot Audition

Shiho Matsubayashi*1, Reiji Suzuki*1, Fumiyuki Saito*2, Tatsuyoshi Murate*2, Tomohisa Masuda*2, Koichi Yamamoto*2, Ryosuke Kojima*3, Kazuhiro Nakadai*4,*5, and Hiroshi G. Okuno*6

*1Graduate School of Information Science, Nagoya University
Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

*2IDEA Consultants, Inc., Japan

*3Graduate School of Information Science and Engineering, Tokyo Institute of Technology
2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan

*4Department of Systems and Control Engineering, School of Engineering, Tokyo Institute of Technology
2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan

*5Honda Research Institute Japan Co., Ltd.
8-1 Honcho, Wako-shi, Saitama 351-0188, Japan

*6Graduate School of Fundamental Science and Engineering, Waseda University
2-4-12 Okubo, Shinjuku, Tokyo 169-0072, Japan

Received:
July 30, 2016
Accepted:
November 1, 2016
Published:
February 20, 2017
Keywords:
acoustic monitoring, microphone arrays, robot audition, HARKBird, the great reed warbler
Abstract

Acoustic Monitoring of the Great Reed Warbler Using Multiple Microphone Arrays and Robot Audition

Spatial distribution pattern of the observed birds and localized sounds

This paper reports the results of our field test of HARKBird, a portable system that consists of robot audition, a laptop PC, and omnidirectional microphone arrays. We assessed its localization accuracy to monitor songs of the great reed warbler (Acrocephalus arundinaceus) in time and two-dimensional space by comparing locational and temporal data collected by human observers and HARKBird. Our analysis revealed that stationarity of the singing individual affected the spatial accuracy. Temporally, HARKBird successfully captured the exact song duration in seconds, which cannot be easily achieved by human observers. The data derived from HARKBird suggest that one of the warbler males dominated the sound space. Given the assumption that the cost of the singing activity is represented by song duration in relation to the total recording session, this particular male paid a higher cost of singing, possibly to win the territory of best quality. Overall, this study demonstrated the high potential of HARKBird as an effective alternative to the point count method to survey bird songs in the field.

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Last updated on Nov. 20, 2017