Research on the sound field simulation system for acoustic virtual reality in auditoriums

适用于音乐厅、歌剧院等礼堂的音质设计。和其他活动大厅。到目前为止，人们已经研究了声学模型实验和数值模拟技术。以提高这些模拟技术的效率。一种获得声学虚拟现实的模拟技术。本研究的主要内容如下：(1)在三维声场中实现自然的听觉感受。研制了1/10比例的假人头传声器系统。利用该系统可以近似模拟双耳头部周围的双耳传递函数。(2)发展了一种用于缩尺模型实验中脉冲响应测量的数字信号处理技术。将双耳脉冲响应与任意声源(干音乐、语音等)进行卷积，合成“霍尔声”。(3)研制了跨耳演示系统，利用位于消声室中的两个扬声器系统，可以听到具有三维空间感觉的合成声音。采用比例建模技术的混合模拟技术，以及本研究开发的数字模拟技术，不仅可以预测厅堂的物理特性，而且可以预测观众席的主观印象。这种模拟技术将对礼堂的声学设计非常有用。

For the acoustical designing of such auditoriums as concert halls, opera theaters. and other event halls. acoustic scale medel experiment and numerical simulation techniques have been investigated so far. In order to improve the efficiencies of these simulation techniques. a simulation technique to get acoustic virtual reality. by which subjective impression can be obtained by hearing the sounds in models of auditoriums, has been developed in this study as follows.(1) To realize natural hearing sensation in three dimensional sound fields. a 1/10 scale dummy head microphone system has been developed. By using this system, the binaural transfer function around a head with both ears can be approximately simulated.(2) Digital signal processing techniques have been developed for the measurement of impulse responses in scale model experiments. and for synthesis of "hall sounds" by convolving the binaural impulse responses and arbitrary sound sources (dry music, speech and so on).(3) The transaural presentation system has been developed, by which we can hear the synthesized sound with three dimensional spatial sensation by using two loudspeaker system located in an anechoic room.By the hybrid simulation technique using scale modelling technique, and the digital simulation technique developed in this study, not only physical characteristics but also subjective impression in auditoriums can be predicted. This simulation technique will be very useful for the acoustical design of auditoriums.