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Sequential and Direct Access of HRTFs for Quasi-Continuous Angular Positions

Authors:
Christiane Antweiler and Peter Vary
Book Title:
Proceedings of European Signal Processing Conference (EUSIPCO)
Venue:
Barcelona, Spain
Event Date:
29.8.-2.9.2011
Organization:
EURASIP
Date:
Aug. 2011
Pages:
1648–1652
ISSN:
2076-1465
Language:
English

Abstract

Binaural rendering is based on head-related transfer functions (HRTFs) to reproduce the soundfield around the listener using stereo-headphones. Especially, for the perception of moving sound sources, a high angular resolution of the measured HRTFs is needed.

A continuous HRTF representation with quasi-infinite azimuthal resolution can be obtained with a system identification approach which relies on a sequentially recursive adaptation process. As a consequence, it enables by nature the sequential access of HRTFs, e.g., for the virtualization of rotating sound sources. However, so far the direct access of a HRTF of an arbitrary azimuthal position, for a sudden change of the sound source position, is not possible without knowledge of neighboring HRTFs.

To overcome this limitation, we present a new implementation strategy enabling a flexible, i.e., a sequential and direct, access of ‘Perfect Sequence LMS based HRTFs’. We will prove that we obtain numerically the same high-quality HRTFs as before, without increase of storage requirements, and a significantly reduced computational complextity.

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