A self-adaptive stochastic resonator with logarithmic transfer

We introduce a new self-adaptive stochastic resonator system as a simple mo del for sensing mechanisms. The model is based on a level-crossing detector (LCD) with stepwise, dynamically increasing and relaxing threshold level a fter each firing event. The transfer function is found to be logarithmic-li ke over a wide range (six decades) of the input signal amplitude. Results o n its dynamical response and adaptation characteristics are in accordance w ith adaptation and overshooting phenomena at real sensing. (C) 2000 Elsevie r Science Ltd. All lights reserved.