输入方波信号的过阻尼谐振子的随机共振

Stochastic resonance of square wave signal in an overdamped harmonic oscillator

计算了在输入方波信号情况下过阻尼谐振子的输出功率谱和信噪比,详细讨论了相应的随机共振现象,并与输入余弦信号情况进行对比.研究发现:它们均出现随机共振现象,且均存在共振和抑制并存的现象.但这一并存现象,在两模型中分别出现于不同的共振曲线.

The output power and the signal-to-noise ratio of an overdamped harmonic oscillator are calculated in the case of square wave signal input.The corresponding stochastic resonance phenomenon and the comparison with the case of cosine signal input are discussed.Results reveal that there appear the stochastic resonances in these two cases,and the phenomenon in which the resonance and suppression are coexistent,but the coexistence phenomenon appears in the different stochastic resonance curves for these two models.