A Study on Signal Processing using Multimedia Contents and Kansei Evaluation for Super High Fidelity Reproducing System.

近来的多媒体技术使得可以容易地构造各种视听环境并再现三维声场。头部相关传递函数（HRTF）通常用于通过使用FIR滤波器来实现该声场。这些FIR滤波器在控制系统的实现上有许多技术难点。在我们过去的研究中，我们解决了这些问题的设计过程中的HRTF使用IIR滤波器。在本研究中，提出一种利用IIR滤波器的近似方法，以简单地实现三维声音定位。此外，我们还从心理学的角度研究了视听交互，以再现一个视觉-听觉的高呈现空间。结果，通过该效果，声场的再现性向更高频带提高。此外，利用在近似条件下设计的HRTF进行了水平面上的远距离声定位实验。因此，我们相信我们所提出的方法对于未来超三维声场的再现是有用的。

Recent multi-media technology has made it possible to easily construct various audio-visual environments and to reproduce a three-dimensional sound field. Head-related transfer functions(HRTFs) are usuallyused for realizing that sound field by using FIR filters. These FIR filters have many difficult technical-items for realizing control system. In our past study, we solved these problems by means of designing procedure for the HRTF using IIR filters. In this research, an approximation method using IIR filters has been proposed for simply realization of the three-dimensional sound localization. Furthermore, we studied audio-visual interaction from a psychological viewpoint for reproducingan auditory-visual high presencespace. As the result, the reproducibility of a sound field wasimproved to the higher frequency band by the effect. Moreover, sound localization experimentsin distance on a horizontal plane were carried out usingour HRTFs designed under the approximation conditions with a transaural reproduction. Then, we believe that our proposal methods are useful for reproducing a super three-dimensional sound fieldin future.