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Stochastic resonance behaviors of bistable systems connected in series

Guo Yan Wang Tai-Yong Wang Wen-Jin Hu Shi-Guang Leng Yong-Gang

Stochastic resonance behaviors of bistable systems connected in series

Guo Yan, Wang Tai-Yong, Wang Wen-Jin, Hu Shi-Guang, Leng Yong-Gang
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Publishing process
  • Received Date:  17 December 2003
  • Accepted Date:  12 May 2004
  • Published Online:  17 March 2005

Stochastic resonance behaviors of bistable systems connected in series

  • 1. (1)山东工商学院信息与电子工程学院,烟台264005; (2)天津大学机械工程学院,天津300072; (3)天津大学机械工程学院,天津300072;山东工商学院信息与电子工程学院,烟台264005

Abstract: The stochastic resonance(SR) characteristics of two bistable systems connected in series have been investigated. It is deduced that the first bistable system of the cascaded system is most important because of its converting a white noise into a color one, and the subsequent bistable systems continuously concentrate noise energy into lowfrequency area in terms of Lorentzian distribution, which weakens the highfrequency dithering of the last output waveform and outlines the basic shape of the wave. The law of the signal spectral amplitude varying with noise intensity indicates that within a limited lowfrequency band, the cascaded system is able to promote the height of the signal spectral spike by a certain amount of noise. If the former of the cascaded system does not stay in SR, the latter could not optimize the former output to become a SR state. With the increase of the number of the bistable systems in the cascaded system, the lowfrequency area where most of the noise energy is collected will be narrowed gradually, and hence the signal peak is easily reduced and submerged in noise. For this case, in spite of using the twice-sampling technique to improve the signal spectral spike, the improvement is limited. Therefore, a single bistable system is effective for signal detection.

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