Rosen S, Baker R J, Darling A
Department of Phonetics & Linguistics, University College London, England.
J Acoust Soc Am. 1998 May;103(5 Pt 1):2539-50. doi: 10.1121/1.422775.
Auditory filters broaden with increasing level. Using a recently developed method of fitting filter shapes to notched-noise masking data that explicitly models the nonlinear changes in filter shape across level, results at 2 kHz from 9 listeners over a wide range of levels and notch widths are reported. Families of roex(p,w,t) filter shapes lead to models which account well for the observed data. The primary effect of level is a broadening in the tails of the filter as level increases. In all cases, models with filter parameters depending on probe level fit the data much better than masker-dependent models. Thus auditory filter shapes appear to be controlled by their output, not by their input. Notched-noise tests, if performed at a single level, should use a fixed probe level. Filter shapes derived in this way, and normalized to have equal tail gain, are highly reminiscent of measurements made directly on the basilar membrane, including the degree of compression evidenced in the input-output function.
听觉滤波器会随着声级的增加而变宽。使用一种最近开发的方法，将滤波器形状拟合到带凹口噪声掩蔽数据，该方法明确地对滤波器形状随声级的非线性变化进行建模，报告了9名听者在2千赫兹、广泛的声级范围和凹口宽度下的结果。roex(p,w,t)滤波器形状族产生的模型能很好地解释观测数据。声级的主要影响是随着声级增加，滤波器尾部变宽。在所有情况下，滤波器参数取决于探测声级的模型比取决于掩蔽声级的模型对数据的拟合要好得多。因此，听觉滤波器的形状似乎由其输出而非输入控制。如果在单一声级进行带凹口噪声测试，应使用固定的探测声级。以这种方式得出并归一化以具有相等尾部增益的滤波器形状，与直接在基底膜上进行的测量非常相似，包括输入 - 输出函数中显示的压缩程度。
