Hearing aid receivers operate over a large dynamic range and reach output levels of up to 131 dB. Electromagnetic receivers are commonly used in hearing aids since they offer a very high efficiency. Receivers are typically characterized by their linear transfer function. These linear distortions are easily measured with standard methods and if compensation is applied it is often limited to the magnitude transfer function. The current study addresses a more complete characterization of the hearing aid receiver by measurement of the nonlinear transfer function. Nonlinear distortions of the receiver are output level dependent and might negatively influence measures like speech intelligibility of an aided hearing impaired person, particularly at high levels.
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