Hawaii Institute of Marine Biology, University of Hawaii, PO Box 1106, Kailua, Hawaii 96734, USA.
J Acoust Soc Am. 2012 Jan;131(1):577-81. doi: 10.1121/1.3664076.
Recent studies indicate some odontocetes may produce echolocation beams with a dual-lobed vertical structure. The shape of the odontocete echolocation beam was further investigated in a false killer whale performing an echolocation discrimination task. Clicks were recorded with an array of 16 hydrophones and frequency-dependent amplitude plots were constructed to assess beam shape. The majority of the echolocation clicks were single-lobed in structure with most energy located between 20 and 80 kHz. These data indicate the false killer whale does not produce a dual-lobed structure, as has been shown in bottlenose dolphins, which may be a function of lowered frequencies in the emitted signal due to hearing loss.
最近的研究表明，一些齿鲸可能会产生具有双峰垂直结构的回声定位波束。在一只伪虎鲸执行回声定位辨别任务时，进一步研究了齿鲸回声定位波束的形状。使用 16 个水听器阵列记录了点击声，并构建了与频率相关的幅度图，以评估波束形状。大多数回声定位点击声呈单叶结构，大部分能量位于 20 至 80 kHz 之间。这些数据表明，伪虎鲸不像宽吻海豚那样产生双峰结构，这可能是由于听力损失导致发射信号频率降低的功能。
