Comparison of in-situ calibration methods for quantifying input to the middle ear.
Comparison of in-situ calibration methods for quantifying input to the middle ear.
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DOI：
10.1121/1.3243310
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发表时间：
2009-12
期刊：
影响因子：
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通讯作者：
James D Lewis;R. McCreery;S. Neely;P. Stelmachowicz
中科院分区：
文献类型：
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作者：
James D Lewis;R. McCreery;S. Neely;P. Stelmachowicz
现场声压级测量对驻波压力最小值敏感，并有可能导致过度放大，从而对助听器配件中的残余听力造成风险。前向压力水平（FPL）量化了朝向鼓膜行进的压力，并且可能是一种潜在的解决方案，因为它对耳道压力最小值不敏感。FPL的推导依赖于戴维南等效源校准技术，从而产生源压力和阻抗。这种技术被发现，准确地分解成入射和反射组件在一个硬壁测试腔和人耳道腔压力通过推导的第二个声级测量称为集成压力水平（IPL）。IPL通过入射和反射压力振幅的总和来量化。FPL和IPL都被调查作为声级进入中耳的措施。FPL可能是一个更好的测量中耳输入，因为IPL更依赖于中耳反射率和耳道电导。在助听器应用中使用FPL有望提供一种精确量化高频放大的方法。
Sound pressure level in-situ measurements are sensitive to standing-wave pressure minima and have the potential to result in over-amplification with risk to residual hearing in hearing-aid fittings. Forward pressure level (FPL) quantifies the pressure traveling toward the tympanic membrane and may be a potential solution as it is insensitive to ear-canal pressure minima. Derivation of FPL is dependent on a Thevenin-equivalent source calibration technique yielding source pressure and impedance. This technique is found to accurately decompose cavity pressure into incident and reflected components in both a hard-walled test cavity and in the human ear canal through the derivation of a second sound-level measure termed integrated pressure level (IPL). IPL is quantified by the sum of incident and reflected pressure amplitudes. FPL and IPL were both investigated as measures of sound-level entering the middle ear. FPL may be a better measure of middle-ear input because IPL is more dependent on middle-ear reflectance and ear-canal conductance. The use of FPL in hearing-aid applications is expected to provide an accurate means of quantifying high-frequency amplification.