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偏置信号调制下色关联噪声驱动的线性系统的随机共振
Stochastic resonance for bias-signal-modulated noise in a linear system
【摘要】 研究了偏置信号调制下关联分段噪声驱动的过阻尼线性系统的随机共振现象,推导出了一阶矩、二阶矩和信噪比的解析表达式.通过对信噪比曲线的分析,发现该系统中存在三种不同形式的随机共振:传统的随机共振、真正的随机共振和广义的随机共振.此外,数值结果还表明,加性噪声能够减弱输出的信噪比,而噪声之间的互相关强度能够使输出的信噪比增强.
【Abstract】 The stochastic resonance (SR) is studied in an overdamped linear system when the bias-signal-modulated noise is introduced. The exact expressions of the first two moments and signal-to-noise ratio(SNR) are obtained when we introduce the asymmetric dichotomous noise into the system. We find that the system has three different forms of SR: the conventional SR, the bona fide SR and SR in the broad sense. Moreover, the additive noise weakens the SNR of the linear system while the cross-correlation enhances the SNR and improves the output signal.
【关键词】 随机共振;
信噪比;
偏置信号调制的噪声;
分段噪声;
【Key words】 stochastic resonance; signal-to-noise ratio; bias-signal-modulated noise; dichotomous noise;
【Key words】 stochastic resonance; signal-to-noise ratio; bias-signal-modulated noise; dichotomous noise;
【基金】 国家自然科学基金(批准号:10472091和10332030);陕西自然科学基金资助的课题(批准号:2003A03)资助的课题.~~
- 【文献出处】 物理学报 ,Acta Physica Sinica , 编辑部邮箱 ,2005年11期
- 【分类号】TN911;
- 【被引频次】22
- 【下载频次】231