Advise: A new method for high definition virtual acoustic display
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A method for high definition virtual acoustic display (VAD) based on a model called the ''virtual sphere model'' is introduced in this paper. This method is named ``ADVISE'' (Acoustic Display based on the VIrtual SpherE model). In ADVISE, a virtual sphere-shaped boundary is defined around a listener, and the sound transmission for the sound source in the original field to the entrances of the listener's ears is divided into two parts. One consists of Head-Related Transfer Functions (HRTFs) corresponding to the points on the boundary of the virtual sphere, and the other consists of Room Transfer Functions (RTFs) from the sound source to the points on the boundary. Then, these two kinds of transfer functions are convolved in real-time, taking into account dynamic changes in these functions due to the listener's head movement. In this paper, the theory of ADVISE is described in detail.