In this paper, we describe a dataset of head-related transfer functions (HRTFs) measured at the Research Institute of Electrical Communications, Tohoku University. The current dataset includes HRTFs for 105 subjects at 72 azimuths  13 elevations of spherical coordinates. Anthropometric data for 39 subjects are also included. The measurement and postprocessing methods are outlined in this paper. These data will be freely accessible for nonprofit academic purposes via the Internet. Moreover, this dataset will be included in an international joint project to gather several HRTF datasets in a unified data format.
This paper deals with a method for controlling the sound field using multiple sound sources and sensors. Methods based on Kirchhoff′s integral equation are the effective and promising ones. However, even if the sound pressure on the boundary of the controlled region is given, the sound field inside it cannot be controlled if the frequency of reproduced sound coincides with one of the eigenfrequencies defined by internal Dirichlet problem of the controlled region. For avoiding this problem, a new method using additional control points within the controlled region is proposed in this study. The results of computer simulation showed that sound field can successfully be reproduced by the proposed method. Moreover, a method for distributing the additional control points is discussed. As a result, it is shown that sound field control is properly achieved when the additional control points are so located that a partial area of the region under consideration is controlled based on the sound intensity on the boundary of the area.
Abstract:A new theory for high definition Virtual Acoustic Display (VAD) based on a model called the ''Virtual Sphere (VS) model'' is introduced in this paper. This method is named ADVISE (Acoustic Display based on the VIrtual SpherE model). In ADVISE, a sphere-shaped boundary is defined around a listener, and the sound transmission from 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 the dynamic changes in these functions due to the listener's head movement. The Kirchhoff-Helmholtz boundary integral equation is the theoretical basis of this idea. This equation represents that a sound field generated by sound sources outside a certain closed boundary can be synthesized by phantom monopole and dipole sources distributed on the boundary. In this paper, the theory of ADVISE is stated, then the features of ADVISE are described.
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