Abstract
A dual-resonance nonlinear (DRNL) filter [Meddis et al., J. Acoust. Soc. Am. 106, 2852–2861 (2001)] was fitted to model chinchilla cochlear responses to tonal stimuli at individual sites along the basilar membrane (BM) with best frequencies (BF) of 0.8, 5.5, 7.25, 9.75, 10.0, 12.0, and 14.0 kHz. At each BF, parameters were obtained for the DRNL filter to reproduce input/output and tuning curves. The match between the model and the experimental data is almost perfect for frequencies near BF. Quantitatively, the model response gets worse (but is still reasonable) for frequencies well below and well above BF. These discrepancies are discussed in terms of the middle-ear function, which proves critical. The model responses to clicks, AM, multicomponent, and Schroder-phase stimuli were also compared against experimental data. Results show that the architecture of the DRNL filter seems suitable to reproduce this wide range of phenomena. Strategies are discussed for developing a chinchilla nonlinear cochlear filterbank from current parameters. [Work supported by the Consejería de Sanidad of the Junta de Comunidades of Castilla, La Mancha.]
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