ESTIMATION OF EARDRUM ACOUSTIC PRESSURE AND OF EAR CANAL LENGTH FROM REMOTE POINTS IN THE CANAL

被引:53
作者
CHAN, JCK
GEISLER, CD
机构
[1] UNIV WISCONSIN,DEPT ELECT & COMP ENGN,MADISON,WI 53706
[2] NICOLET BIOMED INSTRUMENTS CORP,MADISON,WI 53711
关键词
D O I
10.1121/1.398799
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Sound pressure distributions in the human ear canal, whether unoccluded or occluded with ear molds, were studied using a probe tube technique. On average, for frequencies below 6 kHz, the measuring probe tube had to be placed within 8 mm of the vertical plane containing the top of the eardrum (TOD), determined optically, in order to obtain sound pressure magnitudes within 6 dB of “eardrum pressure.” To obtain that accuracy in all of the eight subjects studied, the probe had to be within 6 mm of the TOD. Since probe location relative to the drum has to be known, a purely acoustic method was developed which can be conveniently used to localize the probe-tip position, utilizing the standing wave property of the sound pressure in the ear canal. The acoustically estimated “drum location” generally lay between the optically determined vertical planes containing the TOD and the umbo. On average, the “drum. location” fell 1 mm medial to the TOD. Of the 32 estimates made acoustically in various occluded and unoccluded conditions in 14 subjects, 30 estimates lay within a ± 2-mm range of this average. © 1990, Acoustical Society of America. All rights reserved.
引用
收藏
页码:1237 / 1247
页数:11
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