Origin of the double- and multi-pulse structure of echolocation signals in Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientialis).
Origin of the double- and multi-pulse structure of echolocation signals in Yangtze finless porpoise (Neophocaena phocaenoides asiaeorientialis).
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DOI：
10.1121/1.2126919
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发表时间：
2005-12
期刊：
影响因子：
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通讯作者：
Songhai Li;Ke‐Xiong Wang;Ding Wang;T. Akamatsu
中科院分区：
文献类型：
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作者：
Songhai Li;Ke‐Xiong Wang;Ding Wang;T. Akamatsu
海豚和江豚的信号往往呈现出多脉冲结构。在这里，回声定位信号记录是在一个相对较小的封闭区域内临时栖息的七只长江江豚的四个几何位置上进行的。有些点击呈现双脉冲结构，另一些则表现为多脉冲结构。在来自四个不同位置的数据中，双脉冲和多脉冲点击的第一个脉冲和第二个脉冲之间的脉冲间隔有显著差异(P&t；0.01，单因素方差分析)。这些结果表明，双脉冲和多脉冲回声定位信号的脉冲间隔和结构取决于动物水听器的几何形状，长江江豚回声定位信号的双脉冲和多脉冲结构不是由发声江豚本身造成的，而是信号的多径传播造成的。多脉冲结构的180度相移表面反射脉冲和非相移底部反射脉冲相对于直接信号的时间延迟可用于计算到发声动物的距离。
The signals of dolphins and porpoises often exhibit a multi-pulse structure. Here, echolocation signal recordings were made from four geometrically distinct positions of seven Yangtze finless porpoises temporarily housed in a relatively small, enclosed area. Some clicks demonstrated double-pulse, and others multi-pulse, structure. The interpulse intervals between the first and second pulse of the double- and multi-pulse clicks were significantly different among data from the four different positions (p < 0.01, one-way ANOVA). These results indicate that the interpulse interval and structure of the double- and multi-pulse echolocation signals depend on the hydrophone geometry of the animal, and that the double- and multi-pulse structure of echolocation signals in Yangtze finless porpoise is not caused by the phonating porpoise itself, but by the multipath propagation of the signal. Time delays in the 180 degrees phase-shifted surface reflection pulse and the nonphase-shifted bottom reflection pulse of the multi-pulse structures, relative to the direct signal, can be used to calculate the distance to a phonating animal.