International Symposium on Nonlinear Theory and Its Applications
Reproduction of Nonlinear Cochlea Response by Asynchronous Bifurcation Processor
Kentaro Takeda, Hiroyuki Torikai,
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An asynchronous bifurcation processor (ABP) is a nonlinear dynamical system with discrete states and a continuous time. It has been shown that artificial neural systems implemented by the ABP consumes less hardware resource than artificial neural systems implemented by usual. On the other hand, the cochlea is a complicated biological nonlinear dynamical system. In this paper, an artificial cochlea model based on the ABP is studied. It is shown that the model can mimic physiologically measured frequency tuning curves of various animals based on the Hopf bifurcation. Then, the occurrence mechanism of the bifurcation is analyzed by using discrete-continuous hybrid Poincare map. In addition, it is confirmed that an FPGA implemented circuit can mimic physiologically measured frequency tuning curves.