Abstract: The resistance to interference of 30 Leaf-nosed bats, Rhinolophus rouxi was examined as an obstacle avoidance score reached at noise and ultrasonic background, respectively.We found that the ability of obstacle avoidance was not influenced by broadband noise jamming. The abilities of Rhinolophus rouxi to resist ultrasonic interferences have been tested also. The abilities of obstacle avoidance have not been disturbed by the characteristic frequency of the species 85kHz and background frequencies 65kHz, 75kHz, 95kHz, or 105kHz.It is shown that the echolocation system of bats have evolved effective abilities for resisting interferences of background noise and ultrasonic signals in order to detect biologically relevant informations from natural environment.

Key words: Obstacle avoidance, Noise jamming, Resistance to interference, Characteristic frequency

摘要： 实验在30只鲁氏菊头蝠(Rhinolcphus rouxi)中进行。使用障碍回避测定法,观察了白噪声和不同频率超声干扰对回避障碍能力的影响。发现宽频带白噪声不能干扰动物回避障碍的成功率。分别使用该动物的特征频率85kHz正弦波,以及相近的65kHz、75kHz、95kHz和105kHz的超声干扰信号,都不能影响障碍回避成功率。实验结果提示,食虫蝙蝠的生物声纳系统具有很强的抵抗白噪声和超声信号干扰的能力,以保证它们从周围环境中获取有意义的生物信息。

关键词: 障碍回避, 噪声干扰, 抗干扰, 特征频率