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

• 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

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

结果大致分类如下：(1)音频系统：(i)录音：麦克风阵列的主瓣宽度最大为30度，用于定向录音。 ii) 扬声器：最好使用同相驱动的平板扬声器，面积为 A2 复印纸大小或更大 (iii) 组合：麦克风阵列可以贴在平板的边缘。声学反馈相对较小且麦克风阵列的方向图可以与单独时相同的控制的扬声器 (iv) 传输通道：考虑到两个或多个扬声器同时讲话，语音传输需要独立的 3 或 4 个通道。 (v) 信号处理：可以使用本研究开发的信号处理技术对教室中录制的混响语音进行去混响，以提高语音清晰度。 (vi) 演讲者图像：显示演讲者的图像。 (2)标准：本研究中新提出的“轻松听觉理解”心理量表对于评估实验检查中使用的两个说话者同时说话的情况的音频系统的性能是有效的。清楚地显示音频系统的性能差异，找到带来“教室感觉”或宽敞房间的声学特性，并找到相反的阻碍它们的特性。 (3) 虚拟现实的应用：应用虚拟现实技术对于远程协作学习，[1] 找到了一种估计房间传递函数的时间变化的方法，这有助于减少声反馈，[2] 找到了获得头部相关脉冲响应的近似方法，用于创建虚拟听觉[3] 找到了在虚拟听觉空间中表达疗愈感的方法。 (4) 正在申请专利：平板扬声器的3D声像技术已被引入个人计算机。由 NEC 制造，命名为“Authen Surround。”总而言之，实现远程协作学习的音频系统可以通过各种心理测试来确定其有效性。

项目成果

Discrimination of temporal change in interaural cross-correlation coefficient using band-pass filtered noise burst convolved with simulated impulse response

使用与模拟脉冲响应卷积的带通滤波噪声突发来辨别耳间互相关系数的时间变化

• 发表时间: 2005
• 期刊: Acoust. Sci. & Tech. 26
• 作者: K Terada;H Yanagawa;M Takagiwa;M Fukushima
• 通讯作者: M Fukushima

Polynomial approximation of binaural impulse responses for moving sound images

运动声像双耳脉冲响应的多项式逼近

• 发表时间: 2004
• 期刊: Proc.of the Institute of Acoustics Vol.26, pt.8
• 作者: M.Matsumoto;H.Yanagawa
• 通讯作者: H.Yanagawa

A method of interpolating binaural responses for moving sound images

一种对运动声像进行双耳响应插值的方法

• 发表时间: 2003
• 期刊: Acoust.Sci. & Tech.(日本音響学会英文論文誌) 24
• 作者: M.Matsumoto;M.Tohyama;H.Yanagawa
• 通讯作者: H.Yanagawa

音響信号処理装置

声波信号处理装置

• 发表时间: 2004

A method for the determination of noise factor in estimated transfer function - cross spectral technique by use of 1-0 and 1-000 windows

一种确定估计传递函数中噪声因子的方法 - 使用 1-0 和 1-000 窗的互谱技术

• 发表时间: 2004
• 期刊: Proc. of The 18th International Congress on Acoustics Fr2.E.3
• 作者: M Fukushima;H Inoue;K Kamura;H Yanagawa;K Kido
• 通讯作者: K Kido