抄録
A number of experiments have been carried out in order to research how to design the interior of a four-channel sound control room for so called “Hi-Vision” (high-definition televison). In this four-channel sound reproduction form, the three main channels are reproduced from the three front loudspeakers, and the surrounding sound of the fourth channel is reproduced from the two rear ones. In these experiments, interiors of the test rooms were varied in accordance with five measuring conditions. However, room shapes were not varied. The experimental items were:(1) static transfer frequency re sponse, (2) mean frequency spectrum of music sound, (3) questionnaire, (4) subjective estimation. The results from the following three viewpoints were analyzed:(1) less coloration, (2) the width of the listening area, (3) the amenities of the sound production room. It was found that when treating the front walls, ceiling, and floor with absorbent materials and providing the rear with a diffusive and reflective surface, the results were superior in all experimental items. It was also confirmed that this concept is applicable to ordinary two-channel sound control rooms. Experimental results in actual twochannel sound control rooms are also mentioned.
