Byrne D, Dillon H, Ching T, Katsch R, Keidser G
National Acoustic Laboratories, Chatswood, New South Wales, Australia.
J Am Acad Audiol. 2001 Jan;12(1):37-51.
A new procedure for fitting nonlinear hearing aids (National Acoustic Laboratories' nonlinear fitting procedure, version 1 [NAL-NL1]) is described. The rationale is to maximize speech intelligibility while constraining loudness to be normal or less. Speech intelligibility is predicted by the Speech Intelligibility Index (SII), which has been modified to account for the reduction in performance associated with increasing degrees of hearing loss, especially at high frequencies. Prescriptions are compared for the NAL-NL1, desired sensation level [input/output], FIG6, and a threshold version of the Independent Hearing Aid Fitting Forum procedures. For an average speech input level, the NAL-NL1 prescriptions are very similar to those of the well-established NAL-Revised, Profound procedure. Compared with the other procedures, NAL-NL1 prescribes less low-frequency gain for flat and upward sloping audiograms. It prescribes less high-frequency gain for steeply sloping high-frequency hearing losses. NAL-NL1 tends to prescribe less compression than the other procedures. All procedures differ considerably from one another for some audiograms.
本文描述了一种用于适配非线性助听器的新程序（国家声学实验室非线性适配程序，第1版[NAL-NL1]）。其基本原理是在将响度限制在正常或更低水平的同时，最大化言语可懂度。言语可懂度通过言语可懂度指数（SII）来预测，该指数已进行修改，以考虑与听力损失程度增加相关的性能下降，尤其是在高频时。对NAL-NL1、期望感觉级[输入/输出]、FIG6以及独立助听器适配论坛程序的阈值版本的处方进行了比较。对于平均言语输入水平，NAL-NL1处方与成熟的NAL修订版深度程序的处方非常相似。与其他程序相比，对于平坦和向上倾斜的听力图，NAL-NL1规定的低频增益较少。对于陡峭倾斜的高频听力损失，它规定的高频增益较少。与其他程序相比，NAL-NL1倾向于规定较少的压缩。对于某些听力图，所有程序彼此之间存在很大差异。
