Experimental Study on Acoustical Effects of Concert Hall to Music Players

在音乐会声学中，音乐演奏者在舞台上的听觉印象与观众的听觉印象一样重要。在这一点上，本研究采用现场测量和实验室实验相结合的方法进行了基础调查，明确了运动员的有利条件。本研究包括两个主要内容：身体调查和心理实验。对于前者的研究，设计了专门的舞台声学条件测量技术和设备，并在不同类型的音乐厅进行了实际的现场测量。为了研究演奏者的听觉印象与舞台声学条件之间的关系，本研究新开发了两种声场模拟技术：一种是设置在消声室中的多声道再现系统，另一种是使用耳机的双耳模拟系统。这两个系统都是由实时数字计算系统实现的。利用这些技术，对舞台反射器的早期反射和观众区后部的长延迟反射等声学现象进行了多次实验。因此，已经证实，对于一般科目来说，早期的反思并不明显，但对球员来说可能是有效的。对于长延迟反射，人们发现，如果延迟时间和强度合适，这种反射是有益的。

In concert hail acoustics, auditory impression of music players on the stage is essentially important as well as that of the audience. On this point, basic investigations to make clear the favorable conditions for players have been carried out in this study by field measurements and laboratory experiments.This research consists of two main contents : physical investigation and psychological experiment. For the former study, special technique and equipment to measure the acoustic condition on a stage was contrived, and actual field measurements were performed in various type of concert halls. From these results, the constructions of impulse response corresponding to the architectural factors were investigated.In order to investigate the relationships between players' auditory impression and the acoustic conditions on the stages, two kinds of sound field simulation techniques have been newly developed in this study : one is multi-channel reproduction system set in an anechoic room and the other is binaural simulation system using a headphone. Both of these system were realized by real-time digital computing system. By using these technique, several experiments on such acoustic phenomena as early reflections from stage reflectors and long-delayed reflections from the rear part of the audience area were performed. As a result, it has been confirmed that the early reflections which are not clearly distinctive for general subjects could be effective for players. Concerning long-delayed reflections, it has been found that this kind of reflection can be beneficial if its delay time and strength are appropiate.