Neuman A C, Bakke M H, Mackersie C, Hellman S, Levitt H
Center for Research in Speech and Hearing Sciences, Graduate School, City University of New York, New York 10036, USA.
J Acoust Soc Am. 1998 May;103(5 Pt 1):2273-81. doi: 10.1121/1.422745.
Two experiments were carried out to determine how manipulating the compression ratio and release time of a single-band wide dynamic range hearing aid affects sound quality. In experiment I, compression ratio was varied over the range from linear to 10:1 (low compression threshold, attack time = 5 ms, release time = 200 ms). In experiment II, compression ratios of 1.5, 2, and 3:1 were combined with release times of 60, 200, and 1000 ms (attack time = 5 ms). Twenty listeners with sensorineural hearing loss rated the clarity, pleasantness, background noise, loudness, and the overall impression of speech-in-noise (Ventilation, Apartment, Cafeteria) processed through a compression hearing aid. Results revealed that increasing compression ratio caused decreases in ratings on all scales. Increasing release time caused ratings of pleasantness to increase, and ratings of background noise and loudness to decrease. At the 3:1 compression ratio, increasing the release time caused increases in ratings of clarity, pleasantness, and overall impression, and a decrease in background noise. Significant correlations were found between scales. Regression analysis revealed that the contributions of the scales of clarity, pleasantness, background noise, and loudness to the prediction of overall impression differed as a function of the competing noise condition.
进行了两项实验，以确定单通道宽动态范围助听器的压缩比和释放时间的调整如何影响音质。在实验I中，压缩比在从线性到10:1的范围内变化（压缩阈值低，启动时间=5毫秒，释放时间=200毫秒）。在实验II中，1.5、2和3:1的压缩比与60、200和1000毫秒的释放时间相结合（启动时间=5毫秒）。20名感音神经性听力损失的听众对通过压缩助听器处理的语音在噪声环境（通风环境、公寓环境、自助餐厅环境）中的清晰度、愉悦度、背景噪声、响度和整体印象进行了评分。结果显示，压缩比增加导致所有量表的评分降低。释放时间增加导致愉悦度评分增加，背景噪声和响度评分降低。在3:1的压缩比下，释放时间增加导致清晰度、愉悦度和整体印象评分增加，背景噪声降低。各量表之间存在显著相关性。回归分析表明，清晰度、愉悦度、背景噪声和响度量表对整体印象预测的贡献因竞争噪声条件而异。
