Binaural reproduction/synthesis is one of promising ways to present spatial auditory space to a listener. Generally, binaural signals can be reproduced by a set of headphones. An alternative way for presentation of binaural signals is to use loudspeakers without wearing any equipment like headphones by employing so called crosstalk cancellation (CTC). A CTC system is realized by inverse filters, i.e. CTC filters, which cancel transfer functions between loudspeakers and both ears. However, coefficients of CTC filters vary with listener’s position and orientation, thereby resulting in a quite small sweet spot and forcing a listener to be still while listening. Therefore, the authors have been developing dynamic CTC system using head tracking and real-time filter generation which allows the listener to move and rotate his/her head freely. However, optimal positions of loudspeakers for dynamic CTC for a single listener system have not been clarified. In this paper, we use a spherical loudspeaker array to evaluate impacts of loudspeaker arrangement on robustness of CTC system.
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