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Relaxation dynamics of spontaneous otoacoustic emissions perturbed by external tones: Response to a single tone at multiple suppression levels.

Authors
Murphy-WJ; Tubis-A; Talmadge-CL
Source
J Acoust Soc Am 1995 Nov; 98(5)(Pt. 2):2944
NIOSHTIC No.
20045251
Abstract
The relaxation dynamics of spontaneous otoacoustic emissions (SOAEs) interacting with an external tone have been successfully described using a Van der Pol limit-cycle oscillator model [Murphy et al., J. Acoust. Soc. Am. 97, 3702-3711 (1995a) and Murphy et al., J. Acoust. Soc. Am. 97, 3712-3720 (1995b)]. The theory developed in Murphy et al. (1995a) includes the possibility for multiple external tones to produce suppression of the oscillator amplitude. The relaxation dynamics are dependent upon the final state of the oscillator. The oscillator's rate of transition between two suppressed states is a function of K2 2 r 1, the final amount of suppression and the negative damping parameter r 1. Data were collected from an SOAE interacting with a single frequency ipsilateral suppressor. Transitions between different suppressed states were achieved by adding or removing signal at the same frequency. The ability of the relaxation dynamics theory to describe this special case will be examined.
Keywords
Acoustical-measurements; Mathematical-models; Acoustic-vibration; Acoustic-signals; Biophysics; Noise-frequencies
Contact
William J. Murphy, Bioacoust. and Occup. Vib. Sect., Natl. Inst. for Occup. Safety and Health, MS C-27, 4676 Columbia Pkwy., Cincinnati, OH 45226-1998
CODEN
JASMAN
Publication Date
19951101
Document Type
Abstract
Fiscal Year
1996
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
0001-4966
NIOSH Division
DBBS
Source Name
Journal of the Acoustical Society of America
State
OH; IN
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