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，并描述如下。（1）音频系统：（i）记录：麦克风阵列的主灯宽度为30度。最大值的定向记录。得出了麦克风阵列的最佳布置。 （ii）扬声器：最好使用平板扬声器，该扬声器是驱动的，并且具有A2复制纸张尺寸或更多的区域。 （iii）组合：可以连接麦克风阵列（v）信号处理：重新生长式扬声器的取代，其中声馈回声是相对微不足道的麦克风阵列的指令模式，并且可以与单独单独使用时相同。 （iv）传输渠道：语音传输需要独立3或4个渠道来考虑两个或更多扬声器说话。 （v）信号处理：可以通过使用本研究中开发的信号处理技术来完成课堂中记录的再生言语的覆盖，以使语音智能变得更好。 （vi）扬声器形象：提示扬声器的更多显示图像改善了语音智能。 （2）标准：本研究中新提出的“易听性听觉理解”的心理量表的评估对于估计音频系统的性能有效。在实验检查中使用的两个说话者说话的条件清楚地表明了音频系统的性能差异。发现了带有“在教室里的感觉”或宽敞的房间的声学特征，并且发现了这些障碍。 （3）虚拟现实的应用：要应用虚拟现实的技术来区分协作学习，[1]发现一种方法可以估计房间转移功能的临时变化，这有助于减少声学馈回的回馈，[2]近似方法获得与头部相关的冲动响应，用于创建虚拟听觉空间。 [3]发现在虚拟听觉空间中表达治愈感的方法。 （4）申请专利：适用于专利的平板扬声器的3D声音图像技术。它已经被引入了NEC名为“ Authen Alloding”的个人计算机。为了包括音频系统以团结一致地实现独特的协作学习，可以弄清楚各种心理学检查支持哪些有效性。较少的

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