Dynamic range and asymmetry of the auditory filter
作者:
Brian R. Glasberg,
Brian C. J. Moore,
Roy D. Patterson,
Ian Nimmo‐Smith,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1984)
卷期:
Volume 76,
issue 2
页码: 419-427
ISSN:0001-4966
年代: 1984
DOI:10.1121/1.391584
出版商: Acoustical Society of America
数据来源: AIP
摘要:
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 μPa), 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.
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