Jin In-Ki, Kates James M, Arehart Kathryn H
Division of Speech Pathology and Audiology, Research Institute of Audiology and Speech Pathology, Hallym University, Chuncheon, Gangwon-do, South Korea.
Department of Speech, Language and Hearing Sciences, University of Colorado, Boulder.
J Speech Lang Hear Res. 2017 Jun 10;60(6):1674-1680. doi: 10.1044/2017_JSLHR-H-16-0348.
This study aims to evaluate the sensitivity of the speech intelligibility index (SII) to the assumed speech dynamic range (DR) in different languages and with different types of stimuli.
Intelligibility prediction uses the absolute transfer function (ATF) to map the SII value to the predicted intelligibility for a given stimuli. To evaluate the sensitivity of the predicted intelligibility to the assumed DR, ATF-transformed SII scores for English (words), Korean (sentences), and Mandarin (sentences) were derived for DRs ranging from 10 dB to 60 dB.
Increasing the assumed DR caused steeper ATFs for all languages. However, high correlation coefficients between predicted and measured intelligibility scores were observed for DRs from 20 dB to 60 dB for ATFs in English, Korean, and Mandarin.
Results of the present study indicate that the intelligibility computed from the SII is not sensitive to the assumed DR. The 30-dB DR commonly used in computing the SII is thus a reasonable assumption that produces accurate predictions for different languages and different types of stimuli.
本研究旨在评估言语可懂度指数（SII）对不同语言及不同类型刺激下假定言语动态范围（DR）的敏感性。
可懂度预测使用绝对传递函数（ATF）将SII值映射到给定刺激的预测可懂度。为评估预测可懂度对假定DR的敏感性，针对10分贝至60分贝的DR范围，得出了英语（单词）、韩语（句子）和汉语（句子）经ATF变换后的SII分数。
假定DR增加会使所有语言的ATF更陡峭。然而，对于英语、韩语和汉语的ATF，在20分贝至60分贝的DR范围内，预测可懂度分数与实测可懂度分数之间观察到高相关系数。
本研究结果表明，根据SII计算出的可懂度对假定DR不敏感。因此，计算SII时常用的30分贝DR是一个合理假设，能对不同语言和不同类型刺激做出准确预测。
