Auditory filter nonlinearity across frequency using simultaneous notched-noise masking
Auditory filter nonlinearity across frequency using simultaneous notched-noise masking
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DOI：
10.1121/1.2139100
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发表时间：
2006-01-01
影响因子：
2.4
通讯作者：
Rosen, S
中科院分区：
文献类型：
--
作者：
Baker, RJ;Rosen, S
心理声学掩蔽实验已被广泛应用于耳蜗功能的研究。在人类听众中。在这里，我们使用同步陷波噪声掩蔽实验在正常听力的听众的听觉滤波器形状的变化与刺激水平在0.25-6 kHz的频率范围内的特征。在每个频率下，使用固定信号电平（30-70 dB SPL）和固定掩蔽电平（20-50 dB SPL频谱电平）的范围，以便获得对各个收听者中的滤波器形状的准确描述。个体收听者的陷波噪声数据用两个滤波器形状模型拟合：其中滤波器裙部作为探测音调水平的线性函数而改变的圆指数（roex）形状，以及其中尖端滤波器相对于滤波器尾部的增益作为信号水平的函数而改变的另一个圆指数（roex）形状[Alberberg和摩尔，J. Acoust.美国社会108，2318-2328（2000）]。然后，这些拟合模型的参数用一组简单的方程来描述，这些方程量化了听觉滤波器形状在水平和频率上的变化。这两个模型同样很好地拟合数据，并且都表现出随着频率的增加而增加的尖尾增益。(c)2006年，美国声学学会。
Psychoacoustic masking experiments have been widely used to investigate cochlear function. in human listeners. Here we use simultaneous notched-noise masking experiments in normal hearing listeners to characterize the changes in auditory filter shape with stimulus level over the frequency range 0.25-6 kHz. At each frequency a range of fixed signal levels (30-70 dB SPL) and fixed masker levels (20-50 dB SPL spectrum level) are used in order to obtain accurate descriptions of the filter shapes in individual listeners. The notched-noise data for individual listeners are fitted with two filter shape models: a rounded exponential (roex) shape in which the filter skirt changes as a linear function of probe-tone level and the other, in which the gain of the tip filter relative to the filter tail changes as a function of signal level [Glasberg and Moore, J. Acoust. Soc. Am. 108, 2318-2328 (2000)]. The parameters for these fitted models are then described with a simple set of equations that quantify the changes in auditory filter shape across level and frequency. Both these models fitted the data equally well and both demonstrated increasing tip-tail gain as frequency increased. (c) 2006 Acoustical Society of America.