Filtering to match hearing aid insertion gain to individual ear acoustics.
Filtering to match hearing aid insertion gain to individual ear acoustics.
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DOI：
10.1177/1084713809344974
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发表时间：
2009-09-01
影响因子：
--
通讯作者：
Bell, Steven L
中科院分区：
文献类型：
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作者：
Bell, Steven L
当通过软件设定助听器增益时，增益是根据患者年龄、性别、模具类型等的平均声学计算的。由于个人耳朵的声学往往与平均值不同，因此设定的增益与真实耳朵的增益之间会存在不匹配。真耳测量可用于验证增益并调整增益以满足目标，但匹配的质量将受到通道数量和助听器灵活性的限制。改进该过程的一种潜在方法是生成一个滤波器，该滤波器补偿由于单个耳朵声学而引起的真耳插入增益的变化。这种滤波器可以包括在数字助听器的处理路径中。本文描述了如何使用加窗方法生成这样的滤波器，并在真实的耳朵中演示了其原理。该方法需要在真耳测量和助听器编程软件之间进行通信。群延迟刚刚超过2 ms的有限脉冲响应滤波器将插入增益与英国听力学会指南定义的可接受容差内的目标值相匹配。
When hearing aid gain is prescribed by software, gain is calculated based on the average acoustics for the age of patient, gender, mold type, and so on. The acoustics of the individual's ear often vary from the average values, so there will be a mismatch between the prescribed gain and the real-ear gain. Real-ear measurement can be used to verify the gain and adjust it to meet targets, but the quality of the match will be limited by the number of channels and the flexibility of the hearing aid. A potential way to improve this process is to generate a filter that compensates for variations in real-ear insertion gain due to individual ear acoustics. Such a filter could be included in the processing path of a digital hearing aid. This article describes how such a filter can be generated using the windowing method, and the principle is demonstrated in a real ear. The approach requires communication between the real-ear measurement and hearing aid programming software. A finite impulse response filter with group delay just over 2 ms matched insertion gain to target values within the acceptable tolerance defined by British Society of Audiology guidelines.