ELECTROACOUSTICAL COMPENSATION HEARING AIDS

基于闭环电声补偿的遮挡消除方法 是由首席调查员在1988年发现的，并通过实验 在阶段I期间在模拟助听器中进行验证，表示为 遮挡消除单元(OCUnit)。使用OCUnit，20分贝 测量咬合效应的减少量。此外，OCUnit 在正反馈振荡之前提供了更高的可用增益， 降低了放大器和接收器失真，减少了直接传输 OCUnitPASS频段之外的环境声音，并提供更好的 低频响应(如果需要)。闭环系统的概念现在已经准备好了 应用于实验设备的设计、制造和测试 入耳式主动助听器(AHA)。 在第二阶段期间将评估两种类型的遮挡补偿， 以及为临床测试制作的AHA的选择。 AHA将在20名听力受损的受试者身上进行评估，其中10名听力正常的受试者 听力通过1000赫兹和中等高频损耗，10 轻度至中度的斜坡性听力损失。商业AHA的计划将 做好准备。

Occlusion reduction based on closed-loop electroacoustical compensation was discovered in 1988 by the Principal Investigator and experimentally verified during Phase I in a simulated hearing aid, denoted as an Occlusion Cancellation Unit (OCUnit). Using the OCUnit, a 20 dB reduction of the occlusion effect was measured. In addition, the OCUnit provided higher available gain before positive feedback oscillation, reduced amplifier and receiver distortion, reduced direct transmission of ambient sound outside of the OCUnit pass band, and provided better low-frequency response (if needed). The closed-loop concept is now ready to be applied to the design, fabrication, and testing of an experimental in-the-ear Active Hearing Aid (AHA). Two types of occlusion compensation will be evaluated during Phase II, and a selection made for the AHA to be fabricated for clinical testing. The AHA will be evaluated on 20 hearing-impaired subjects, 10 with normal hearing through 1000 Hz and a moderate high-frequency loss, and 10 with a mild-to-moderate sloping hearing loss. Plans for a commercial AHA will be prepared.