Kates J M
Siemens Hearing Instruments, Inc., Piscataway, New Jersey.
Ear Hear. 1988 Jun;9(3):119-32. doi: 10.1097/00003446-198806000-00004.
The response of a hearing aid depends on the design of the instrument and on the characteristics of the individual ear. In this paper a computer simulation of an in the ear (ITE) hearing aid is used to determine the effects on the hearing aid response caused by variations in the size of the ear canal, the magnitude of the eardrum impedance, and the vent size and damping. The simulation results indicate that, for an unvented hearing aid, changes in the size of the ear canal or the eardrum impedance shift the average sound pressure level at the eardrum but have relatively small effects on the overall shape of the frequency response. A vented instrument presents a more complicated situation since the vent modifies the low-frequency response in a predictable manner but can have unexpectedly pronounced effects at high frequencies due to the acoustic feedback.
助听器的响应取决于仪器的设计以及个体耳朵的特征。本文使用耳道式（ITE）助听器的计算机模拟来确定耳道大小、鼓膜阻抗大小、通气孔尺寸和阻尼的变化对助听器响应的影响。模拟结果表明，对于无通气孔的助听器，耳道大小或鼓膜阻抗的变化会使鼓膜处的平均声压级发生偏移，但对频率响应的整体形状影响相对较小。有通气孔的仪器情况更为复杂，因为通气孔以可预测的方式改变低频响应，但由于声反馈，在高频时可能会产生意想不到的显著影响。
