Army Audiology and Speech Center, Walter Reed Army Medical Center, Washington, DC 20307, USA.
J Acoust Soc Am. 2009 Nov;126(5):2683-94. doi: 10.1121/1.3238257.
This paper presents a compact graphical method for comparing the performance of individual hearing impaired (HI) listeners with that of an average normal hearing (NH) listener on a consonant-by-consonant basis. This representation, named the consonant loss profile (CLP), characterizes the effect of a listener's hearing loss on each consonant over a range of performance. The CLP shows that the consonant loss, which is the signal-to-noise ratio (SNR) difference at equal NH and HI scores, is consonant-dependent and varies with the score. This variation in the consonant loss reveals that hearing loss renders some consonants unintelligible, while it reduces noise-robustness of some other consonants. The conventional SNR-loss metric DeltaSNR(50), defined as the SNR difference at 50% recognition score, is insufficient to capture this variation. The DeltaSNR(50) value is on average 12 dB lower when measured with sentences using standard clinical procedures than when measured with nonsense syllables. A listener with symmetric hearing loss may not have identical CLPs for both ears. Some consonant confusions by HI listeners are influenced by the high-frequency hearing loss even at a presentation level as high as 85 dB sound pressure level.
本文提出了一种简洁的图形化方法，用于比较个别听力障碍（HI）听众与平均正常听力（NH）听众在逐个辅音的基础上的性能。这种表示法称为辅音损失谱（CLP），它描述了听力损失对每个辅音在一定性能范围内的影响。CLP 表明，辅音损失是 NH 和 HI 得分相等时的信噪比（SNR）差异，是辅音依赖性的，并且随得分而变化。这种辅音损失的变化表明，听力损失使某些辅音难以理解，同时降低了某些其他辅音对噪声的鲁棒性。传统的 SNR 损失度量 DeltaSNR(50)定义为 50%识别得分时的 SNR 差异，不足以捕捉这种变化。使用标准临床程序的句子进行测量时，DeltaSNR(50)值比使用无意义音节进行测量时平均低 12dB。双侧听力损失对称的听众可能不会对两只耳朵都有相同的 CLP。一些 HI 听众的辅音混淆甚至在高达 85dB 声压级的呈现水平下也受到高频听力损失的影响。
