On the implementation of range extrapolation of head-related impulse responses by virtual sound field synthesis

S Spors, H Wierstorf, "On the implementation of range extrapolation of head-related impulse responses by virtual sound field synthesis," in Fortschritte der Akustik - DAGA 2012, p. 311-312 (2012). [ paper ]

Bibtex

@inproceedings{Spors2012a,
    title     = {On the implementation of range extrapolation of head-related
                 impulse responses by virtual sound field synthesis},
    author    = {Spors, Sascha and Wierstorf, Hagen},
    booktitle = {Fortschritte der Akustik - DAGA 2012},
    publisher = {DEGA e.V.},
    address   = {Darmstadt, Germany},
    pages     = {311--312},
    month     = {March},
    year      = {2012}
}

Abstract

Recently an approach to the range extrapolation of head-related impulses responses (HRIRs) has been proposed which is based on interpreting measured HRIRs as virtual secondary source distribution which is driven according to a virtual source at the desired distance. In principle, any sound field synthesis approach can be applied. However, Wave Field Synthesis allows for a numerical stable and efficient implementation of the proposed scheme. Its efficiency is based on pre-filtering the HRIR dataset, and summing up weighted and delayed versions of the HRIRs. In typical implementations the delay operation is restricted to multiples of the temporal sampling interval. In a previous study, these integer delays have been proven to be suitable for static virtual sources synthesized by typical WFS setups. Range extrapolation of HRIRs may involve very densely distributed virtual secondary source distributions. Here integer delays pose limits with respect to the achievable physical accuracy. The limits and potential solutions will be discussed in the paper, as well as, the perceptual consequences in the context of range extrapolation of HRIRs.