Pulse-enhanced stochastic resonance

By adding constant-amplitude pulses to a noisy bistable system, we enhance its response to monochromatic signals, significantly magnifying its unpulse d stochastic resonance. We observe the enhancement in both numerical simula tions and in analog electronic experiments, This simple noninvasive control technique should be especially useful in noisy bistable systems that are d ifficult or impossible to modify internally. (C) 2000 Elsevier Science B.V. All rights reserved.