Motoi Kazuya, Sumiya Miwa, Fujioka Emyo, Hiryu Shizuko
Faculty of Life and Medical Sciences, Doshisha University, 1-3 Tatara Miyakodani Kyotanabe, Kyoto 610-0321, Japan
Faculty of Life and Medical Sciences, Organization for Research Initiatives and Development, Doshisha University, 1-3 Tatara Miyakodani Kyotanabe, Kyoto 610-0321, Japan
J Acoust Soc Am. 2017 May;141(5):EL439. doi: 10.1121/1.4981934.
Three-dimensional directivity patterns of sonar sounds emitted by Japanese house bats (Pipistrellus abramus) during natural foraging were measured by a 44-channel microphone array. Just before prey capture, the terminal frequency (TF) of emitted sounds decreased, and the beam width (mean ± standard deviation) expanded from 40 ± 10° to 63 ± 9° (horizontal) and from 32 ± 10° to 52 ± 7° (vertical). P. abramus decrease the TF to simultaneously expand the beam width in both the horizontal and vertical planes, while retaining the target within the three-dimensional acoustic field of view at the final stage of capture.
通过一个44通道的麦克风阵列测量了日本伏翼（Pipistrellus abramus）在自然觅食期间发出的声纳声音的三维指向性模式。就在捕获猎物之前，发出声音的终端频率（TF）降低，波束宽度（平均值±标准差）从40±10°扩展到63±9°（水平），从32±10°扩展到52±7°（垂直）。日本伏翼降低终端频率，以便在水平和垂直平面上同时扩大波束宽度，同时在捕获的最后阶段将目标保持在三维声场内。
