Article

Spatial Interpolation of HRTFs Approximated by Parametric IIR Filters (online)

* Presenting author
Day / Time: 24.03.2022, 10:00-10:20
Room: 47-03
Typ: Vortrag (strukturierte Sitzung)
Online-access: Bitte loggen Sie sich ein, damit weitere Inhalte sichtbar werden (bspw. der Zugang zur Onlinesitzung).
Abstract:

In binaural synthesis through headphones, head-related transfer functions (HRTFs) are used to position virtual sound sources in the three-dimensional space around the listener. In practice, only a finite number of measured HRTFs is available, resulting in a limited spatial resolution. One approach to increase the spatial resolution is the usage of spatial interpolation of the measured HRTFs. When the measured HRTFs are represented as finite impulse response (FIR) filters, bilinear rectangular or triangular interpolation can be used to compute the filter coefficients of an intermediate direction. However, when the measured HRTFs are represented as infinite impulse response (IIR) filters instead, the interpolation of the coefficients is not as straightforward as for FIR filters due to stability considerations. In this work, an interpolation algorithm is proposed targeting HRTFs represented as cascades of parametric IIR filters. This interpolation algorithm is based on the bilinear interpolation of the parameters of the individual filter stages (center frequency, gain, and Q-factor) together with an assignment of related peak filters. In order to evaluate the proposed interpolation algorithm, two listening tests are performed including static virtual sound sources as well as moving virtual sound sources. The results confirm the validity of the proposed interpolation algorithm.

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