Glasberg B R, Moore B C, Patterson R D, Nimmo-Smith I
J Acoust Soc Am. 1984 Aug;76(2):419-27. doi: 10.1121/1.391584.
This experiment was designed to measure the shape and asymmetry of the auditory filter over a wider dynamic range than has been measured previously. Thresholds were measured for 2-kHz sinusoidal signals in the presence of two 800-Hz-wide noise bands, one above and one below the signal frequency. The spectrum level of the noise was 45 dB (re: 20 muPa), and the noise bands were placed both symmetrically and asymmetrically about the signal frequency. The deviation of the signal frequency from the nearer edge of each noise band varied from 0 to 0.8 times the signal frequency. Each ear of six subjects was tested, and the subjects' ages ranged from 22 to 74 years. The auditory filters derived from the data were somewhat asymmetric, with steeper slopes on the high-frequency side; the degree of asymmetry varied across subjects. The asymmetry could be characterized as a uniform stretching of the (linear) frequency scale on one side of the filter. The dynamic range of the auditory filter exceeded 60 dB in the younger listeners, but the dynamic range and sharpness of the filter tended to decrease with increasing age.
本实验旨在测量听觉滤波器在比以往测量范围更广的动态范围内的形状和不对称性。在存在两个800赫兹宽的噪声带的情况下，测量了2千赫兹正弦信号的阈值，一个噪声带在信号频率之上，一个在信号频率之下。噪声的频谱级为45分贝（相对于20微帕），并且噪声带相对于信号频率对称和不对称放置。信号频率与每个噪声带较近边缘的偏差从0到信号频率的0.8倍不等。对6名受试者的每只耳朵进行了测试，受试者年龄在22岁至74岁之间。从数据得出的听觉滤波器有些不对称，高频侧的斜率更陡；不对称程度因受试者而异。不对称性可表征为滤波器一侧（线性）频率标度的均匀拉伸。年轻听众的听觉滤波器动态范围超过60分贝，但滤波器的动态范围和锐度往往随着年龄增长而降低。
