关于声学比—混响时间—语言清晰度关系的实验与理论计算

ON THE RELATIONS OF ACOUSTIC RATIO-REVERBERATION TIME-SPEECH ARTICULATION,EXPERIMENTS AND THEORADICAL CALCULATION

摘要: 以前有关室内声场中语言清晰度问题的研究,都仅涉及混响时间“T”对语言清晰度“S”的变化关系,至于同一个“T”而不同声学比“R”的影响考虑很少。本文专为对各个不同T的条件下,“R”对“S”的影响进行定量研究。得到清晰度S与混响时间T乘声学比R的归一化实验曲线,并用声学比-混响系数K_rR的形式表示为K_rR=1.0-0.22lg（TR）或S％=98.7-21.7lg（TR）。这个结果说明:混响场中的语言清晰度S与（TR）乘积的对数成反比。令人惊奇的是,这个实验所得的物理律的形式类似于Weber-Fechner定律,但要比它复杂得多。

Abstract: In the earlier studies on the speech articulation in reverberant sound field in room covered only the relations between the articulation score S and the reverberation time T.
The role played by the acoustic ratio R i investigated on a quatitative basis. We have disigned the experiment in a special laboratory to obtain a normolized experimental curve of the articulation vs the product RT. The curve is expressed by a form of efficiency of acoustic ratio-reverbration time K_rR as
K_rR=1.0-0.22 lg (TR)
or S%=98.7-21.7 lg (TR)