In recent years, the rapid development of information and communication technology (ICT) and the influence of the novel coronavirus (COVID-19) have affected our lives and work in various fields such as medical and welfare, construction and manufacturing and education, etc. With this global background, teleconference systems have received attention and become a new trend. However, the acoustics of rooms using teleconference system often overlap the acoustic characteristics from multiple rooms on both the speaker and listener sides. Therefore, it can sometimes be difficult to listen to each other. A prior study suggested that the installation of sound-absorbing panels improves intelligibility and reduces the listening difficulty for young people. However, elderly people must be included in the target owing to the effects of aging. This study aimed to clarify improvements in the subjective assessments of elderly people in a room where a teleconference system is used. In addition, the differences in subjective assessments between young people and elderly people were also investigated. The results of an experiment indicate that, first, a room using a teleconference system demonstrated a greater improvement in subjective assessments after the acoustic improvements compared to the same room where face-to-face meetings. Second, the subjective assessments and improvements of them for elderly people differed greatly since older user had listening habits and experiences that varied from those of young people.

近年来，信息通信技术（ICT）的快速发展和新型冠状病毒（COVID-19）的影响在医疗福利、建筑制造、教育等各个领域影响着我们的生活和工作。在这种全球背景下，电话会议系统受到关注，成为一种新趋势。然而，使用电话会议系统的房间的声学特性通常会在发言者和听众方面与多个房间的声学特性重叠。因此，有时很难互相倾听。之前的一项研究表明，安装吸音板可以提高清晰度并降低年轻人的听力难度。但是，由于老龄化的影响，必须将老年人纳入目标。本研究旨在阐明老年人在使用电话会议系统的房间中的主观评估的改进。此外，还调查了年轻人和老年人主观评价的差异。实验结果表明，首先，与面对面会议的同一房间相比，使用电话会议系统的房间在声学改进后表现出更大的主观评估改善。其次，由于老年用户的听音习惯和体验与年轻人不同，因此对老年人的主观评价和改进存在很大差异。还调查了年轻人和老年人主观评价的差异。实验结果表明，首先，与面对面会议的同一房间相比，使用电话会议系统的房间在声学改进后表现出更大的主观评估改善。其次，由于老年用户的听音习惯和体验与年轻人不同，因此对老年人的主观评价和改进存在很大差异。还调查了年轻人和老年人主观评价的差异。实验结果表明，首先，与面对面会议的同一房间相比，使用电话会议系统的房间在声学改进后表现出更大的主观评估改善。其次，由于老年用户的听音习惯和体验与年轻人不同，因此对老年人的主观评价和改进存在很大差异。