Resolution enhancement of a general HRTF library
نویسندگان
چکیده
Head Related Transfer Function (HRTF) libraries enable the generation of virtual acoustic sources in arbitrary spatial positions. In experiments with a large number of test subjects, general or non-personified HRTF libraries are used, measured with human-shaped dolls. The resolution of azimuth in the frontal area is much better than in lateral areas. To improve resolution in lateral areas, Principal Component Analysis (PCA) on 37 HRTF magnitudes at elevation 0 was performed. The 1 and, in part, the 2 weight were found to be monotonic functions of azimuth, with greater slope at an azimuth of around 0 and smaller in lateral areas. To enhance resolution in lateral areas, the weights were linearly interpolated and the slope was increased to become constant over all azimuths in the median plane (from -90 to 90) and reconstructed HRTFs using those modified weights. Localization tests performed with original and modified HRTFs showed that resolution in the frontal area remains the same, while there is a noticeable improvement of resolution in the lateral areas (azimuths ±90 and ±45).
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تاریخ انتشار 2005