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Selection and Tuning of HRTFs
The aim of the present work is the reproduction of a five-channel signal over headphones. Informal listening tests show that a large number of different HRTFs do not have the desired level of quality. The frontal localisation was either elevated or completely undefined. The coloration in all directions - even with correct IPTFs - was far too strong for a high quality reproduction. In order to overcome this problem two HRTFs sets together with IPTFs were selected out of a big database. These transfer functions were subsequently tuned by a tuning expert. The main methods used for tuning were smoothing and parametric equalizing of amplitude and phase with individual settings for every direction and for the left and right ear. Listening experiments that confirm the tuning results for a panel of listeners are presented and discussed. The resulting transfer functions have clearly reduced coloration and improved global localisation although with modest improvements in the frontal position.
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