Stochastic resonance in parabolic-bistable potential system with an additive colour noise
Liang Gui-Yun (梁贵云)ab
a National Astronomical Observatories, Chinese Academy of Science, Beijing 100012, China; b Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Science, Beijing 100080, China
Abstract We propose a new model (parabolic bistable system) with a colour noise source. In the presence of periodic input signal, we investigate the output signal to-noise ratio and the power spectral density of output signal, in which the self-correlation time may be an arbitrary value with no restriction. We find that the curves of signal-to-noise ratio versus the noise intensity D exhibits a bell-shape behaviour. The peak height increases with the increasing value of amplitude A0 of the input signal. However, the position of peak does not shift. Moreover, the signal-to-noise ratio is insensitive to the modulation frequency $\varOmega$, which completely differs from result of Ref.[6]. The power spectral density also has similar behaviour.
Received: 18 October 2002
Revised: 25 November 2002
Accepted manuscript online:
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