Multiplicative Stochastic Resonance for a Linear System Driven by O-U Noise

In the paper, we study a linear system driven by O-U noise and give a method which is different from the one stated in Europhys. Lett. 40 (1997) 117. We find the same phenomenon of multiplicative stochastic resonance for the response of the system to the signal as the one found in Europhys. Lett. 40 (1997) 117. The merit of our method is that it prevents the complex formulas when making sumfrom n=0 to n→∞ as in Europhys. Lett. 40 (1997) 117, which leads to the approximate results of the figures.