Gorlinskiĭ I A, Babushina E S
Biofizika. 1985 Jan-Feb;30(1):133-6.
Sound pressure level of tone was measured using a probe tube microphone at entrance to the dog's external meatus as a function of the azimuth of the sound source. It was demonstrated that directionality of the dog's external ear and corresponding values of interaural intensity differences (delta I) were gradually increased as the tone frequency raised from 0.5 to 40 kHz. Transfer in pinnae locations from lateral to frontal positions (one of the components of orientation reaction to an unexpected sound) resulted in some narrowing of directionality diagrams and in a displacement of their maxima towards the head midline. It was calculated that owing to this effects the extent of monotonic part of the function relating delta I and azimuth of a source were enlarged. The lateral pinnae position was suggested to be optimal for sound detection and the frontal one for localization of the moving sound source.
使用探针管麦克风在犬外耳道入口处测量纯音的声压级，作为声源方位角的函数。结果表明，随着纯音频率从0.5kHz提高到40kHz，犬外耳的方向性以及相应的双耳强度差（δI）值逐渐增加。耳廓位置从侧面转移到正面（对意外声音定向反应的组成部分之一）导致方向性图略有变窄，其最大值向头部中线移动。据计算，由于这种效应，与声源方位角相关的δI函数单调部分的范围增大。建议耳廓位于侧面时最适合声音检测，而位于正面时最适合移动声源的定位。
