A Study on Implementation of Signal Processing for Interactive High Fidelity Trans-aural System using Multimedia Contents.

最近的多媒体技术使得轻松构建各种视听环境并再现三维声场成为可能。头部相关传递函数 (HRTF) 通常用于通过 FIR 滤波器实现声场。这些FIR滤波器在实现控制系统方面有许多困难的技术项目。在本研究中，我们通过使用 IIR 滤波器设计 HRTF 程序来解决这些问题。总之，通过使用我们的 HRTF 近似过程，注意到指定频段 500 Hz 至 2 kHz 和 8 kHz 至 12.5 kHz，声场的再现性提高到了更高频段。此外，我们从心理学的角度研究视听交互，以再现听觉视觉的高临场感空间。结果，听觉-视觉刺激呈现开始时的声像比结束时的声像更强烈地被视觉图像捕获（开始效果）。在外围区域，起始效应的倾向分为两种类型。一是在远离注视点的情况下该效果强烈显现。另一个是该效果在该点附近表现得强烈。

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 usually used for realizing that sound field by using FIR filters. These FIR filters have many difficult technical-items for realizing control system. In this study, we solved these problems by means of designing procedure for the HRTF using IIR filters. In conclusion, the reproducibility of a sound field was improved to the higher frequency band by using our approximation process of HRTFs in taking notice the specified frequency bands 500 Hz to 2 kHz and 8 kHz to 12.5 kHz. And furthermore, we studied audio-visual interaction from a psychological viewpoint for reproducing an auditory-visual high presence space. As the result, the sound image at the beginning of an auditory-visual stimulus presentation was more strongly captured with the visual image than that at the ending (beginning effect). In the peripheral regions, the tendency of the beginning effect was divided into two types. One is that the effect was strongly appeared in away from a gazing point. Another is that the effect was strongly appeared in the near of the point.