Cross-talk in otoacoustic emission probes.
Cross-talk in otoacoustic emission probes.
复制标题
耳声发射探头中的串扰。
DOI：
10.1097/00003446-199504000-00002
复制
发表时间：
1995
期刊：
影响因子：
3.7
通讯作者：
Siegel,JH
中科院分区：
文献类型：
--
作者：
Siegel,JH
目的对几种商用耳声发射探头（Virtual 330， etymtic Research ER-10和ER-IOB， Otodynamics IL088和IL092）进行声源与探头传声器之间的内部耦合（串扰）测试。在一个模拟人耳道的腔中测量被测探头的响应，首先在其正常配置下，然后用建模粘土阻塞声源管或麦克风入口。如果在“阻塞”条件下压力未能大幅下降，则表示串扰。结果发现虚拟330和动态ER-IOB中的串扰严重到足以损害“耳内”声学校准的准确性。在这两种情况下，原因都是声音通过柔性硅胶管的壁辐射，用于通过探针体传导刺激。用壁较硬的声源油管代替，可将串扰降低到常规应用可接受的水平。Otodynamics IL088和KO92系统中使用的探头以及原始的etymtic ERIO探头都具有制造商提供的可接受的低串扰。结论对于发现过多串扰的两个探头，大多数串扰是声学和/或机械的，而不是电磁的。由于串音产生的人工制品无疑污染了这些装置收集到的数据。敦促发射探头制造商采用一种标准来规定串扰水平，并将该规范包括在产品文献中。
ObjectiveSeveral commercial otoacoustic emission probes (Virtual 330, Etymbtic Research ER-10 and ER-IOB, and Otodynamics IL088 and IL092) were tested for internal coupling (cross-talk) between the sound source and probe microphone.DesignThe response of the probe under test was measured, in a cavity that simulates the human ear canal, first in its normal configuration and then with either the sound source tube or the microphone inlet blocked with modelling clay. Cross-talk was indicated if the pressure failed to drop substantially in the “blocked” condition.ResultsCross-talk in the Virtual 330 and Etymutic ER-IOB was found to be severe enough to compromise the accuracy of “in the ear” acoustic calibrations. In both cases the cause was the radiation of sound through the walls of the flexible silicone tubing used to conduct the stimuli through the body of the probe. Substituting harder-walled sound source tubing reduced cross-talk to levels acceptable for routine application. The probes used in the Otodynamics IL088 and KO92 systems and the original Etymbtic ERIO probes all have acceptably low cross-talk as supplied from the manufacturers.ConclusionsFor the two probes where excessive cross-talk was found, most of the cross-talk was acoustic and or mechanical, rather than electromagnetic. Artifacts due to cross-talk have undoubtedly contaminated data collected with these units. Manufacturers of emission probes are urged to adopt a standard for specifying cross-talk levels and include this specification in product literature.