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Implementation Kopfpositionsbezogener Binauraltechnik

Authors Majdak, P., Noisternig, M.
Year 2002
Thesis Type Diploma thesis
Topic Spatial Audio
Keywords Ambisonsics, Wiedergabetechnik, Signalverarbeitung
Abstract Convincing sound reproduction via headphones requires filtering of virtual sources with head related impulse responses (HRIRs) which describe the signals at the two ear drums as a function of the source angle. Regarding hearing in natural sound fields humans are able to improve source localisation capabilities due to small head movements. To benefit from this, head tracking has to be incorporated in the time-varying binaural sound reproduction system. This leads to the problem of high-quality time-varying interpolation between different HRIRs. The proposed method solves this problem with a virtual Ambisonic approach which results in time-invariant filters. The influence of head position is taken into account with a cheap time-variant rotation matrix. A mathematical model is presented to objectively derive sound localisation performance using HRIR based binaural reproduction systems. To evaluate the significance of the proposed mathematical model, listening tests have been carried out. Furthermore, the optimised algorithm is implemented on a DSP to estimate the feasibility to develop a consumer product.
Supervisors Höldrich, R., Sontacchi, A.