Sato Hayato, Morimoto Masayuki, Sato Hiroshi, Wada Megumi
Environmental Acoustics Laboratory, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan.
J Acoust Soc Am. 2008 Apr;123(4):2087-93. doi: 10.1121/1.2885750.
The previous work [Morimoto et al., J. Acoust. Soc. Am. 116, 1607-1613] showed that listening difficulty ratings can be used to evaluate speech transmission performance more exactly and sensitively than intelligibility. Meanwhile, speech transmission performance is usually evaluated using acoustical objective measures, which are directly associated with physical parameters of room acoustic design. However, the relationship between listening difficulty ratings and acoustical objective measures was not minutely investigated. In the present study, a total of 96 impulse responses were used to investigate the relationship between listening difficulty ratings and several objective measures in unidirectional sound fields. The result of the listening test showed that (1) the correlation between listening difficulty ratings and speech transmission index (STI) is the strongest of all tested objective measures, and (2) A-weighted D(50), C(50), and center time, which are obtained from the impulse responses passed through an A-weighted filter, also strongly correlate with listening difficulty ratings, and their correlations with listening difficulty ratings are not statistically different from the correlation between listening difficulty ratings and STI.
此前的研究工作[森本等人，《美国声学学会杂志》116, 1607 - 1613]表明，与可懂度相比，听力困难评级能够更准确、更灵敏地用于评估语音传输性能。同时，语音传输性能通常使用声学客观指标来评估，这些指标与室内声学设计的物理参数直接相关。然而，听力困难评级与声学客观指标之间的关系并未得到详细研究。在本研究中，总共使用了96个脉冲响应来研究单向声场中听力困难评级与若干客观指标之间的关系。听力测试结果表明：(1) 在所有测试的客观指标中，听力困难评级与语音传输指数(STI)之间的相关性最强；(2) 从经过A加权滤波器的脉冲响应中获得的A加权D(50)、C(50)和中心时间，也与听力困难评级高度相关，并且它们与听力困难评级的相关性在统计学上与听力困难评级和STI之间的相关性没有差异。
