There is a growing trend for hearing aids to incorporate wide dynamic range compression. The input/output (I/O) hearing aid formula, presented in this report, is a general frequency-specific mathematical approach which describes the relationship between the input level of a signal delivered to a hearing aid and the output level produced by the hearing aid. The I/O formula relates basic psychoacoustic parameters, including hearing threshold level and uncomfortable listening level, to the electroacoustic characteristics of hearing aids. The main design goal of the I/O formula was to fit the acoustic region corresponding to the ``extended'' normal auditory dynamic range into the hearing-impaired individual's residual auditory dynamic range. The I/O approach can be used to fit hearing aids utilizing linear gain, linear compression or curvilinear compression to a hearing-impaired individual's residual auditory area.
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机译：助听器具有广泛的动态范围压缩的趋势正在增长。本报告中介绍的输入/输出（I / O）助听器公式是特定于频率的通用数学方法，它描述了传递到助听器的信号的输入电平与听力产生的输出电平之间的关系。援助。 I / O公式将基本的心理声学参数（包括听力阈值水平和不舒服的听力水平）与助听器的电声特征联系起来。 I / O公式的主要设计目标是将与“扩展的”正常听觉动态范围相对应的声学区域适合听障人士的残余听觉动态范围。 I / O方法可用于通过线性增益，线性压缩或曲线压缩将助听器安装到听力受损的个体的残余听觉区域。
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