Stochastic resonance (SR) is a counterintuitive phenomenon wherein the noise plays a constructive role in nonlinear dynamic systems, and it becomes a promising way of signal processing recently. Since most of the previous works concentrated on distorted simple-harmonic input and digital signals, we are tending to observe more signal processing features of SR by use of multi-frequency analog signals in this paper. It is difficult to recover the information in the output obtained by a SR system. But for simpl...