Institute of Electrical and Electronics Engineers IEEE ACM transactions on audio, speech, and language processing New York, NY : IEEE, 2014 24(2016), 2, Seite 215-225 Online-Ressource
Proceedings of the EAA Joint Symposium on Auralization and Ambisonics, Berlin, 03th–05th April, 2014 Berlin : Univ.-Verl. der TU, 2014 (2014), Seite 175-181 Online-Ressource
When re-synthesizing individual head related transfer functions (HRTFs) with a microphone array, smoothing HRTFs spectrally and/or spatially prior to the computation of appropriate microphone filters may improve the synthesis accuracy. In this study, the limits of the associated HRTF modifications, until which no perceptual degradations occur, are explored. First, complex spectral smoothing of HRTFs into constant relative bandwidths was considered. As a prerequisite to complex smoothing, the HRTF phase spectra were substituted by linear phases, either for the whole frequency range or above a certain cut-off frequency only. The results indicate that a broadband phase linearization of HRTFs can be perceived for certain directions/subjects and that the thresholds can be predicted by a simple model. HRTF phase spectra can be linearized above 1 kHz without being detectable. After substituting the original phase by a linear phase above 5 kHz, HRTFs may be smoothed complexly into constant relative bandwidths of 1/5 octave, without introducing noticeable artifacts. Second, spatially smoother HRTF directivity patterns were obtained by levelling out spatial notches. It turned out that spatial notches do not have to be retained if they are less than 29 dB below the maximum level in the directivity pattern.
Acoustical Society of America The journal of the Acoustical Society of America Melville, NY : AIP Publ., 1929 135(2014), 4, Seite 2012-2025 Online-Ressource
Acoustical Society of America The journal of the Acoustical Society of America Melville, NY : AIP Publ., 1929 Bd. 133.2013, 5,2, special issue, S. 3525 Online-Ressource
