A 3D real time rendering engine for sound reproduction via headphones is presented. Binaural sound reproduction requires filtering of virtual sources with head related transfer functions (HRTFs). To improve source localization capabilities head tracking as well as room simulation have to be incorporated. This yields the problem of high-quality time-varying interpolation between different HRTFs. The proposed solution uses a virtual ambisonic approach that results in time invariant HRTF filter.
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