Modeling cochlear two-tone suppression using a system of nonlinear oscillators with feed-forward coupling

Abstract

Mechanism of two-tone suppression is studied using a coupled-oscillator model of the cochlea with feed-forward coupling. Local amplification of sound signals is modeled by using Stuart-Landau oscillators near the Hopf bifurcation, and transmission of sound signals is described as feed-forward coupling between the oscillators. Effect of suppressor signals on the response to probe signals is analyzed by numerical simulations. It is found that the effect of suppression is qualitatively different depending on relative frequency between probe and suppressor signals. By analyzing a simplified two-oscillator model, we explain the mechanism of the suppression, where configuration of the oscillators plays an essential role.

A design method for a passive reflectionless transmission-line model based on the cochlea through parameter optimization techniques

“…As an example, it is used as a preprocessing filter for speech recognition with a recursive neural network, wherein it shows better performance than other preprocessing filters [1]. It is used not only for engineering applications but also for reproducing the results of physiological experiments [2].…”