An improved bistable circuitry system for weak signal detection

The stochastic resonance (SR), taking advantage of the noise instead of suppressing it, has been proved to be a novel way to enhance detection, amplification, and transmission of weak signals. The classical SR requires small parameters (e.g., the driving frequency is much lower than 1 Hz) according to the adiabatic approximation. Nevertheless, large parameter problems may usually be involved in real world. This paper focuses on experimental study of weak signal detection from heavy background noise by constructing an improved bistable circuitry system. The nonlinear bistable system is built with electronic circuit to deal with large parameter problems. By the circuitry, this paper explores the effect of band-limited noise on the SR. Experimental results verify the SR phenomenon can be driven by changing the bandwidth of the noise, and by multiscale noise tuning, which makes the weak signal detection much easier to be realized for the non-Gaussian noise case.