教室室内最佳混响时间的研究

信噪比和混响时间是影响教室室内语言清晰度的主要凶素，教室室内信噪比的最佳下限值已有研究结果，但教室室内最佳混响时间仍未形成一致的看法。对教室虚拟声环境下的语言清晰度试验结果进行方差分析，并运用实验心理学的组问数据两两配对比较法，对不同混响条件下的平均语言清晰度得分进行了差异显著性检验，结果表明在高信噪比条件下，体积不超过200^3的教室中频混响时间控制在0．6s左右室内听闻效果最佳。

Research on optimal reverberation time in classrooms

Signal-to-noise ratio and reverberation time are the important factors that influence the speech articulation in classrooms. There is no the consensus of opinion about the optimal reverberation time in classrooms while the consensus about the optimal lower limit of signal-to noise ratio is reached. Speech articulation tests have been done in various virtual classrooms where the reverberation times are different from each other. Variance of articulation index scores in each test are analyzed. And then the significant differences of means between group data are tested with the pair matching comparison method which is idiomatic in the field of experimental psychology. The analytical results show that the optimal reverberation time of mid frequencies in the classroom with a volume of less than 200 m3 and a signal noise ratio of higher than 20dBA is about 0.6 seconds.