Gatehouse Stuart, Naylor Graham, Elberling Claus
MRC Institute of Hearing Research, Glasgow Royal Infirmary, Glasgow, UK.
Int J Audiol. 2006 Mar;45(3):130-52. doi: 10.1080/14992020500429518.
We evaluated the benefits of fast-acting WDRC, slow-acting AVC, and linear reference fittings for speech intelligibility and reported disability, in a within-subject within-device masked crossover design on 50 listeners with SNHL. Five hearing aid fittings were implemented having two compression channels and seven frequency bands. Each listener sequentially experienced each fitting for a 10-week period. Outcome measures included speech intelligibility under diverse conditions and self-reported disability. At a group level, each nonlinear fitting was superior to the linear references for benefits in listening comfort, listener satisfaction, reported intelligibility and speech intelligibility. Slow-acting AVC outperformed the fast-acting WDRC fittings for listening comfort, while for reported and measured speech intelligibility the converse was true. For listener satisfaction there were no group differences between the nonlinear fittings. Analysis in terms of fittings for individual listeners revealed subsets with definite divergences from the group data and hence a need for candidature criteria. There are systematic differences between the benefits of nonlinear and linear fittings, and also within nonlinear fittings with fast versus slow time constants. The patterns of benefit and individual optima depend on the domain of outcome being assessed.
我们采用受试者内设备掩蔽交叉设计，对50名患有重度感音神经性听力损失（SNHL）的受试者，评估了快速作用的宽动态范围压缩（WDRC）、慢速作用的自动音量控制（AVC）和线性参考拟合对言语可懂度及报告的残疾状况的益处。实施了五种具有两个压缩通道和七个频段的助听器拟合。每位受试者依次体验每种拟合，为期10周。结果测量包括不同条件下的言语可懂度和自我报告的残疾状况。在组水平上，每种非线性拟合在聆听舒适度、受试者满意度、报告的可懂度和言语可懂度方面均优于线性参考拟合。慢速作用的AVC在聆听舒适度方面优于快速作用的WDRC拟合，而在报告的和测量的言语可懂度方面则相反。对于受试者满意度，非线性拟合之间没有组间差异。对个体受试者拟合的分析揭示了与组数据有明显差异的子集，因此需要候选标准。非线性和线性拟合的益处之间存在系统差异，并且在具有快速与慢速时间常数的非线性拟合中也存在差异。益处模式和个体最优值取决于所评估的结果领域。
