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A Research and Development of an Audio System to Realize Distant Collaborative Learning with Togetherness

实现远程协同学习的音频系统的研发

基本信息

批准号：
14380084
负责人：
YANAGAWA Hirofumi
金额：
$ 7.55万
依托单位：
Chiba Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14380084/
关键词：
directional recording flat loudspeaker microphone array simultaneous multi-speaker narrow band speech envelope easy aural comprehension virtual reality 3D sound imaging 伝達関数変化移動音像 3次元立体音響パネルスピーカ狭帯域包絡線マガーク効果頭部伝達関数補間因子

项目摘要

The results are classified roughly and described as follows.(1) The audio system : (i) Recording : Main-lobe-width of microphone array is 30 deg. maximum for directional recording. The optimum arrangement of the microphone array is derived. (ii) Loudspeaker : Flat panel loudspeaker is better to be used which is driven in-phase and has an area of A2 copy paper size or more. (iii) Combination : The microphone array can be attached on the edge of the flat panel loudspeaker where the acoustic feed back is comparatively insignificant and directional pattern of the microphone array can be controlled same as when it is alone. (iv) Transmission channel : Independent 3 or 4 channels are needed for speech transmission to consider two or more speakers speak simultaneously. (v) Signal processing : Dereverberation of the reverberant speech recorded in the classroom can be done by using signal processing technique developed in this study to make speech intelligibility better. (vi) Speaker image : To … More display image of the speaker improves speech intelligibility. (2) Criterion : Evaluation by the psychological scale of "easy aural comprehension" newly proposed in this study is valid to estimate performances of the audio system. The condition, in which two speakers speak simultaneously, used in the experimental examination shows the difference of the performance of the audio system clearly. The acoustic characteristics which bring "feel like in a classroom" or spacious of the room are found and to the contrary those impede them are found. (3) Application of Virtual Reality : To apply the technique of Virtual Reality to distant collaborative learning, [1] a method was found to estimate the temporal change of the room transfer function which helps to reduce the acoustic feed back, [2] approximation method to obtain head related impulse response is found used to create the virtual auditory space. [3] the way to express the sense of healing in the virtual auditory space is found. (4) Patent pending : 3D sound image technique for the flat panel loudspeaker is applied for a patent. It is already introduced into the personal computer made by NEC named "Authen Surround."To conclude, the audio system to realize distant collaborative learning with togetherness can be figured out which validity is supported by the various psychological examinations. Less

结果大致归类如下：(1)音频系统：(I)录音：麦克风阵列主瓣宽度为30°。定向录制的最大值。推导出了传声器阵列的最优布置。(Ii)扬声器：最好使用同相驱动且面积为A2复印纸大小或更大的平板扬声器。(Iii)组合：麦克风阵列可以安装在平板扬声器的边缘，在那里声反馈相对较小，麦克风阵列的方向图案可以控制与单独使用时相同。(4)传输通道：语音传输需要独立的3个或4个通道，以考虑两个或多个说话人同时发言。(V)信号处理：利用本研究开发的信号处理技术，可以对课堂上录制的混响语音进行去混响，使语音的清晰度更好。(Vi)演讲者形象：to…说话人的显示图像越多，语音的清晰度就越高。(2)评价标准：本研究新提出的“易听理解”心理量表用于评价听觉系统的表现是有效的。实验测试中使用的两个说话人同时说话的条件清楚地显示了音频系统性能的差异。给人带来“教室般的感觉”或房间宽敞的声学特征被发现，相反，那些阻碍它们的声学特征也被发现。(3)虚拟现实技术的应用：为了将虚拟现实技术应用于远程协作学习，[1]提出了一种估计房间传递函数的时间变化的方法，以减少声反馈；[2]提出了利用近似方法获得与头部相关的脉冲响应来创建虚拟听觉空间。[3]找到了在虚拟听觉空间中表达疗愈感的方法。(4)专利申请：平板扬声器的3D声像技术申请专利。它已经被引入到NEC公司生产的个人计算机中，名为Auten Around。综上所述，实现远程协作学习的音频系统可以通过各种心理测试来验证其有效性。较少