Abstract
We have made extensive measurements of the lower frequency cubic intermodulation distortion product sound pressure in the external auditory meatus of cats. This distortion product has a frequency, fD = 2f1-f2, where f1 is the lower frequency of two pure tone input sounds. A1 and A2 are the amplitudes of the pure tone inputs at frequencies f1 and f2 respectively. The evidence is substantial that this distortion product is generated in the cochlea and that it propagates back out into the ear canal (e.g., Kim, 1980). Our data is presented here as Thevenin equivalent source pressures rather than as raw ear canal pressures. The Thevenin equivalent source pressure is a measurement of the properties of the source (assuming that a system is approximately linear in its overall characteristic) while the raw ear canal pressure depends upon not only the source but also the impedances of the sound delivery system and the animal’s input impedance at the place of pressure measurement. (In animal studies, this is frequently the input impedance at the tympanic membrane.)
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References
Allen, J.B., “Magnitude and Phase-frequency Response to Single Tones in the Auditory Nerve.” J. Acoust. Soc. Am., 73, 2071–2092, 1983.
Fahey, P.F. and Allen, J.B., “Nonlinear Phenomena as Observed in the Ear Canal and at the Auditory Nerve.” J. Acoust. Soc. Am., 77, 599–612, 1985.
Goldstein, J.L., “Auditory Nonlinearity.” J. Acoust. Soc. Am., 41, 676–689, 1967.
Hall, J.L., “Two-tone Distortion Products in a Nonlinear Model of the Basilar Membrane.” J. Acoust. Soc. Am., 56, 1818–1828, 1974.
Kim, D.O., “Cochlear Mechanics: Implications of Electrophysiological and Acoustical Observations.” Hearing Res., 2, 297–317, 1980.
Kim, D.O., Moinar, C.E., and Matthews, J.W., “Cochlear Mechanics : Nonlinear Behavior in Two-Tone Responses as Reflected in Cochlear-Nerve-Fiber Responses and in Ear-Canal Sound Pressure.” J. Acoust. Soc. Am., 67, 1704–1721, 1980.
Matthews, J.W., “Modeling Reverse Middle Ear Transmission of Acoustic Distortion Signals.” In Mechanics of Hearing, pp. 11–18. Editors: E. deBoer and M.A. Viergever. Martinus Nijhoff Publishers, Delft University Press, 1983.
Wilson, J.P., “The Combination Tone 2fl-f2 in Psychophysics and Ear Canal Recordings.” In Psychophysical, Physiological and Behavioral Studies in Hearing, pp. 43–58. Editors: G. Van den Brink and F.A. Bilsen. Delft University Press, Delft, 1980.
Zurek, P.M., Clark, W.W., and D.O. Kim, “The Behavior of Acoustic Distortion Products in the Ear Canal of Chinchillas with Normal and Damaged Ears.” J. Acoust. Soc. Am., 72, 774–780, 1982.
Zwicker, E., “Cubic Difference Tone Level and Phase Dependence on Frequency and Level of Primaries.” In Psychophysical, Physiological and Behavioral Studies in Hearing, pp. 268–273. Editors: G. Van den Brink and F.A. Bilsen. Delft University Press, Delft, 1981.
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© 1986 Springer-Verlag Berlin Heidelberg
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Fahey, P.F., Allen, J.B. (1986). Characterization of Cubic Intermodulation Distortion Products in the Cat External Auditory Meatus. In: Allen, J.B., Hall, J.L., Hubbard, A.E., Neely, S.T., Tubis, A. (eds) Peripheral Auditory Mechanisms. Lecture Notes in Biomathematics, vol 64. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-50038-1_39
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DOI: https://doi.org/10.1007/978-3-642-50038-1_39
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