Department of Otolaryngology/Audiology and EMGO Institute for Health and Care Research, VU University Medical Center, Amsterdam, The Netherlands.
J Acoust Soc Am. 2013 May;133(5):3004-15. doi: 10.1121/1.4798667.
Following previous work [Smits and Festen. (2011). J. Acoust. Soc. Am. 130, 2987-2998] involving the interpretation of speech reception threshold (SRT) data in steady-state noise, the present study considers fluctuating noise. Whereas the SIIsteady function [i.e., the speech intelligibility index (SII) against SNR in steady-state noise] can be approximated by a simple linear function going from 0 to 1 between SNR = -15 dB to +15 dB, the SIIfluc function is a function over a broader range than 30 dB and its maximum lies at a SNR higher than +15 dB. The difference in shape between the SIIsteady and SIIfluc functions has several implications. It predicts a reduction in fluctuating masker benefit (FMB), or even a negative FMB, for higher SNRs for normal-hearing listeners. Experimental data confirm this prediction. Much of the reduction in FMB for hearing-impaired listeners may be attributed to the higher SRTs in steady-state noise for these listeners.
继先前有关稳态噪声中言语接收阈（SRT）数据解释的工作[Smits 和 Festen. (2011). J. Acoust. Soc. Am. 130, 2987-2998]之后，本研究考虑了波动噪声。虽然 SIIsteady 函数[即稳态噪声中的言语可懂度指数（SII）与 SNR 的关系]可以用一个简单的线性函数来近似，该函数在 SNR = -15dB 到 +15dB 之间从 0 到 1 变化，但 SIIfluc 函数是一个在 30dB 以上更广泛范围内的函数，其最大值位于 SNR 高于+15dB 的位置。SIIsteady 和 SIIfluc 函数形状的差异有几个含义。它预测正常听力者的波动掩蔽增益（FMB）会降低，甚至出现负 FMB，尤其是在 SNR 较高的情况下。实验数据证实了这一预测。对于听力受损者，FMB 的大部分减少可能归因于这些人在稳态噪声中的 SRT 较高。
