Head-related transfer functions (HRTFs) describe the filter process of the incident sound caused by reflection, refraction, diffraction and interference with the ear for a random source position in space to one of both ears. Similarly, hearing aid-related transfer functions (HARTFs) describe the sound path to the built-in microphones of a hearing aid device, e.g., behind the ear (BTE). HARTFs are suited for example for medical usage such as hearing aid fitting. It is known that individual HRTF is sensitively affected by different factors such as listener’s head, size and the shape of both ears. Various distance metric could be used to discuss the inter-individual differences.
The aim of this thesis is to determine the differences between varied hearing aid-related transfer functions (HARTFs) from the IHTA-indHARTF database. For reference, the results will be contrasted with a complementary HRTF evaluation. Subsequently, the necessity of individualized HARTFs will be discussed depending on the results. Implications for the design of a dummy head for HARTFs will be further discussed.

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