期刊
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
卷 129, 期 5, 页码 3141-3152出版社
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.3569700
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资金
- PRIN [20083KLJEZ]
This study explores the phenomenology of distortion products in nonlinear cochlear models, predicting their amplitude and phase along the basilar membrane. The existence of a backward-traveling wave at the distortion-product frequency, which has been recently questioned by experiments measuring the phase of basilar-membrane vibration, is discussed. The effect of different modeling choices is analyzed, including feed-forward asymmetry, micromechanical roughness, and breaking of scaling symmetry. The experimentally observed negative slope of basilar-membrane phase is predicted by numerical simulations of nonlinear cochlear models under a wide range of parameters and modeling choices. In active models, positive phase slopes are predicted by the quasi-linear analytical computations and by the fully nonlinear numerical simulations only if the distortion-product sources are localized apical to the observation point and if the stapes reflectivity is unrealistically small. The results of this study predict a negative phase slope whenever the source is distributed over a reasonably wide cochlear region and/or a reasonably high stapes reflectivity is assumed. Therefore, the above-mentioned experiments do not contradict classical models of cochlear mechanics and of distortion-product generation. (C) 2011 Acoustical Society of America. [DOI:10.1121/1.3569700]
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