Moore B C, Glasberg B R, van der Heijden M, Houtsma A J, Kohlrausch A
Department of Experimental Psychology, University of Cambridge, England.
J Acoust Soc Am. 1995 Feb;97(2):1175-82. doi: 10.1121/1.412229.
The notched-noise method has been widely used to estimate the shape of the auditory filter. Results obtained using this method may be influenced by combination bands produced by the interaction of components within the upper band of noise in the notched-noise masker. To assess the possible effect of such combination bands, results were compared for two types of masker: A notched noise, as used in previous experiments; and a masker in which the upper band of noise was replaced by a sinusoid with a frequency corresponding to the lower edge frequency of that band. This is referred to as the noise-tone masker. The signal frequency was 2 kHz, and measurements were obtained for two different spectrum levels of the noise masker, 30 and 45 dB. Auditory filter shapes derived using the two maskers were similar on their low-frequency sides, as expected. The low-frequency sides were less steep at the higher masker level. The high-frequency sides of the auditory filters derived using the noise-tone masker were sometimes slightly steeper than those obtained using the notched-noise masker, but the effect was generally small. Changes with level on the high-frequency sides were not consistent across subjects. An analysis of the notched-noise data taking into account the effects of the combination bands suggests that the maximal spectrum level of the combination bands, in the region just below the lower spectral edge of the primary noise band, is about 20 to 30 dB below the spectrum level of the primary band.(ABSTRACT TRUNCATED AT 250 WORDS)
陷波噪声法已被广泛用于估计听觉滤波器的形状。使用该方法获得的结果可能会受到陷波噪声掩蔽器中噪声上带内各成分相互作用产生的组合音的影响。为了评估此类组合音可能产生的影响，比较了两种掩蔽器的结果：一种是先前实验中使用的陷波噪声；另一种是将噪声上带替换为频率与该带上边缘频率对应的正弦波的掩蔽器。这被称为噪声 - 纯音掩蔽器。信号频率为2 kHz，并针对噪声掩蔽器的两种不同频谱水平（30 dB和45 dB）进行了测量。正如预期的那样，使用这两种掩蔽器得出的听觉滤波器形状在其低频侧相似。在较高的掩蔽器水平下，低频侧的斜率较小。使用噪声 - 纯音掩蔽器得出的听觉滤波器的高频侧有时比使用陷波噪声掩蔽器得出的高频侧稍陡，但这种影响通常较小。高频侧随水平的变化在不同受试者中并不一致。考虑到组合音的影响对陷波噪声数据进行的分析表明，在主噪声带较低频谱边缘正下方的区域，组合音的最大频谱水平比主带的频谱水平低约20至30 dB。（摘要截短于250字）
