Abstract
One of the major problems in cochlear mechanics has been the incapability of cochlea models to provide a simultaneous match to amplitude and phase data of basilar membrane (BM) vibration. Negative results were reported by Allen and Sondhi (1979), Viergever (1980), and Neely (1981), all using a two-dimensional (2D) cochlea model. Steele and Taber (1981) on the other hand found fair agreement between their 3D model calculations and Wilson and Johnstone’s (1975) BM data, which is puzzling since the model parameters were in the range where 2D and 3D responses do not differ significantly.
The apparent contradiction is mainly due to an incorrect interpretation of 2D model results. The ‘BM velocity’ in the customary 2D model is the average of the partition velocity over the channel width rather than the average over the membrane width or the velocity of the BM centreline. The BM/stapes amplitude ratio has, consequently, been underestimated by 10–30 dB in most 2D model calculations. By using the correct definition we have reached good agreement between measurement results (Rhode 1971; Johnstone and Yates 1974) and 2D model results as regards both amplitude and phase.
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© 1983 Delft University Press, The Netherlands
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Viergever, M.A., Diependaal, R.J. (1983). Simultaneous Amplitude and Phase Match of Cochlear Model Calculations and Basilar Membrane Vibration Data. In: de Boer, E., Viergever, M.A. (eds) Mechanics of Hearing. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6911-7_7
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DOI: https://doi.org/10.1007/978-94-009-6911-7_7
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