Fischer W H, Schäfer J W
ENT Clinic, University of Ulm, Germany.
Br J Audiol. 1991 Apr;25(2):123-30. doi: 10.3109/03005369109079842.
The transfer function of the outer ear in humans was determined by using the impulse technique. Signals were delivered from 325 or 393 positions on an imaginary sphere surrounding the experimental subject. Changes of sound pressure level in the ear canal show that certain frequency bands are amplified maximally if they impinge onto the ear from certain directions. For some frequency bands there are two directions of sound incidence that cause best amplification in the ear canal. The directionality of the human pinna appears to increase at higher frequencies. The amount of amplification by the outer ear of frequencies between 2 and 15 kHz was also determined by measuring the free-field transfer function.
通过使用脉冲技术确定了人类外耳的传递函数。信号从围绕实验对象的假想球体上的325个或393个位置发出。耳道内声压级的变化表明，如果某些频段从特定方向撞击耳朵，它们会得到最大程度的放大。对于某些频段，有两个声音入射方向会在耳道内产生最佳放大效果。人类耳廓的方向性似乎在较高频率时会增加。还通过测量自由场传递函数确定了2至15千赫兹频率外耳的放大倍数。
