Correlation between amplitude and frequency fluctuations of spontaneous otoacoustic emissions
作者:
Pim van Dijk,
Hero P. Wit,
Arnold Tubis,
Carrick L. Talmadge,
Glenis R. Long,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1994)
卷期:
Volume 96,
issue 1
页码: 163-169
ISSN:0001-4966
年代: 1994
DOI:10.1121/1.411438
出版商: Acoustical Society of America
数据来源: AIP
摘要:
The normalized cross‐correlation function between the amplitude and frequency fluctuations of 11 spontaneous otoacoustic emissions was measured. A significant correlation was found in seven subjects. The correlation coefficient ranged from −0.37 to +0.65 across subjects. In four subjects, the amplitude fluctuation lagged the frequency fluctuation. The time lag was between 1.6 and 5.5 ms. The results were interpreted using a noise‐perturbed limit‐cycle oscillator with nonlinear (Duffing) stiffness as a model for a spontaneous emission. The data show that the relative increase of the nonlinear stiffness in this model was between −0.010 and +0.015. This indicates that an even‐order nonlinear stiffness plays a minor role in the emission generator.
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