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Study on 3-dimensional spatial hearing and its control for highly advanced acoustic communication

高度先进声学通信的 3 维空间听觉及其控制研究

基本信息

批准号：
10450143
负责人：
SONE Toshio
金额：
$ 7.3万
依托单位：
Akita Prefectural University (1999-2000)Tohoku University (1998)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

In this fiscal year, sound reproduction accuracy of the auditory display proposed last fiscal year was analyzed in detail. The results showed that the error level of around-20 dB can be achieved. This was represented in an international conference on acoustics held last October in Kumamoto.The Effective coding methods of Room Transfer Functions (RTFs) and Head-Related Transfer Functions (HRTFs) were also investigated. Common-pole zero modeling of transfer functions proposed by Haneda et al. was applied to the set of RTFs and HRTFs used in our developed model. As a result, it was shown that this method has a potential to code the information involved in these set of transfer functions effectively with less parameters than those modeled by using the conventional FIR filter banks.Since our proposed sound field reproduction system is based on the straightforward modeling of the sound transmission system, this may be redundant when the dynamic change of the system due to the listener's head movement is taken account. Hence the influence of the listener's head movement in directional hearing was focused in our project. The hearing experiment was executed with the real time system changing the transfer functions convolved with the sound source signal according to the relative position of the sound source and the listener's ears due to his/her head movement sensed by a magnetic sensor. The results showed that the listener's head movement is significantly effective and taking into account the dynamic change is important in the highly accurate auditory display.

本会计年度对上一会计年度提出的听觉显示器的声音再现精度进行了详细分析。结果表明，该方法可以达到-20 dB左右的误差水平。去年10月在熊本举行的国际声学会议上，这一成果得到了体现。研究了房间传递函数（rtf）和头部相关传递函数（hrtf）的编码方法。Haneda等人提出的传递函数的共极零建模应用于我们开发的模型中使用的rtf和hrtf集合。结果表明，与使用传统FIR滤波器组建模的传递函数相比，该方法具有更少参数有效编码这些传递函数集中涉及的信息的潜力。由于我们提出的声场再现系统是基于声音传输系统的直接建模，当考虑听者头部运动引起的系统动态变化时，这可能是多余的。因此，我们的项目重点研究了听者头部运动对定向听力的影响。听觉实验采用实时系统，根据磁传感器感知的听者头部运动导致的声源与听者耳朵的相对位置，改变与声源信号卷积的传递函数。结果表明，听者的头部运动是非常有效的，考虑到动态变化对于高精度的听觉显示非常重要。