Spectral and binaural loudness summation for hearing-impaired listeners
Spectral and binaural loudness summation for hearing-impaired listeners
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DOI：
10.1016/j.heares.2016.03.010
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发表时间：
2016-05-01
期刊：
影响因子：
2.8
通讯作者：
Ewert, Stephan D.
中科院分区：
文献类型：
--
作者：
Oetting, Dirk;Hohmann, Volker;Ewert, Stephan D.
感音神经性听力损失通常会导致响度函数变陡，以及窄带和宽带信号的动态范围从高阈值降低到令人不舒服的响亮水平。听力受损（HI）听者恢复窄带响度感知可能导致宽带信号的过大响度感知，目前尚不清楚双耳呈现如何影响响度感知。本文比较了9名正常听力（NH）和10名HI听者在单耳和双耳条件下不同带宽和不同频谱形状信号的响度感知。对于HI听者，使用频率和电平相关的放大来匹配NH听者的窄带单耳响度函数。NH和HI听众的平均响度函数对单声宽带信号表现出良好的一致性。然而，HI听众对双耳宽带信号的响度明显高于NH听众：达到“非常响”（范围30.8至-3.7 dB）平均需要低14.1 dB。总的来说，在窄带响度补偿的情况下，对于高于“中等响度”的宽带信号，HI听众的系统双耳响度低于NH听众。这种增加的双耳响度总和在“中等响度”以下的响度类别或窄带信号中没有发现。在增加的响度总和中观察到很大的个体差异，这不能用听力图或窄带响度函数来解释。(C) 2016 Elsevier B.V.版权所有
Sensorineural hearing loss typically results in a steepened loudness function and a reduced dynamic range from elevated thresholds to uncomfortably loud levels for narrowband and broadband signals. Restoring narrowband loudness perception for hearing-impaired (HI) listeners can lead to overly loud perception of broadband signals and it is unclear how binaural presentation affects loudness perception in this case. Here, loudness perception quantified by categorical loudness scaling for nine normal-hearing (NH) and ten HI listeners was compared for signals with different bandwidth and different spectral shape in monaural and in binaural conditions. For the HI listeners, frequency- and level-dependent amplification was used to match the narrowband monaural loudness functions of the NH listeners. The average loudness functions for NH and HI listeners showed good agreement for monaural broadband signals. However, HI listeners showed substantially greater loudness for binaural broadband signals than NH listeners: on average a 14.1 dB lower level was required to reach "very loud" (range 30.8 to -3.7 dB). Overall, with narrowband loudness compensation, a given binaural loudness for broadband signals above "medium loud" was reached at systematically lower levels for HI than for NH listeners. Such increased binaural loudness summation was not found for loudness categories below "medium loud" or for narrowband signals. Large individual variations in the increased loudness summation were observed and could not be explained by the audiogram or the narrowband loudness functions. (C) 2016 Elsevier B.V. All rights reserved.