Database of individual HRTFs measured at the eardrum and multiple hearing device microphone locations
* Presenting author
Sound transmission effects through the external ear, which are described by the head-related transfer function (HRTF), are individual to each ear and relate closely to sound localization and timbre perception. How well this information is preserved in the microphone signal of a hearing device depends heavily on its style and the exact microphone position in the individual ear. Therefore, knowledge about transfer functions to the device’s microphone and their quality is highly relevant for the design and evaluation of hearing aids and consumer products like hear-through headsets. We present measurements of individual HRTFs recorded at the eardrum and the microphones of a comprehensive set of hearing device styles including a total of 14 recording locations. The data was obtained from 16 individual subjects and 3 dummy heads for 91 sound incidence directions, including 48 in the horizontal plane. In addition, corresponding headphone transfer functions were measured for all microphone locations where this was possible. Variations of the head position after changing earpieces as a particular source of error were limited to less than 0.5° by utilizing a head tracker system with graphical feedback, and individually measured microphone and loudspeaker responses were spectrally deconvolved. The database will be publicly available.