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J4  2012, Vol. 46 Issue (5): 918-922    DOI: 10.3785/j.issn.1008-973X.2012.05.023
光学工程、生物医学工程     
参数调节随机共振增强稳态视觉诱发电位
朱丹华,陈大竞,陈裕泉,潘敏
浙江大学 生物医学工程系,浙江 杭州 310027
Enhancement of steady-state visual evoked potentials using
parameter-tuned stochastic resonance
ZHU Dan-hua, CHEN Da-jing, CHEN Yu-quan, PAN Min
Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, China
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摘要:

针对提高稳态视觉诱发电位(SSVEP)信噪比的问题,提出一种基于参数调节随机共振来增强SSVEP的信号处理方法.该方法利用基于自回归模型的白化滤波器去除脑电频谱中存在的1/f趋势,通过改变采样频率的频率压缩方法把SSVEP频率线性转换为小于1的频率,使白化滤波后的信号符合随机共振产生的条件,调节双稳态系统参数实现随机共振效应,从而增强SSVEP信噪比.结果表明,通过该方法处理后,原本淹没在背景噪声中的SSVEP频率在频谱中凸现出来,信噪比得到显著增强,从3.07提高到5.76,增大了1.88倍,说明参数调节随机共振有助于检测SSVEP.

Abstract:

Aiming at increasing the signal-to-noise ratio of the steady state visual evoked potential (SSVEP), a method based on parametertuned stochastic resonance (SR) for enhancing SSVEP is proposed in this paper. This method applied a whitening filter based on an autoregressive (AR) model to remove the 1/f trend in EEG spectrum, and then linearly converted the SSVEP frequency to one smaller than 1 Hz to meet the condition where SR could occur by changing the sample frequency smaller. Finally, SR effect was achieved by tuning the parameters of a bistable system so that the SSVEP can be enhanced. The result shows that a peak at the SSVEP frequency appears in EEG spectrum after processing with the proposed method and the signal-to-noise ratio of the SSVEP increases from 3.07 to 5.76, 1.88 times as against before. It is demonstrated that this method is helpful in detecting SSVEP.

出版日期: 2012-05-01
:  R 318.0  
基金资助:

中央高校基本科研业务费专项资金资助项目(2010XZZX002-5).

通讯作者: 陈裕泉,男,教授,博导.     E-mail: yqchen@mail.bme.zju.edu.cn
作者简介: 朱丹华(1980-),男,博士生,从事生物医学信号处理. E-mail: danhua.zhu@gmail.com
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引用本文:

朱丹华,陈大竞,陈裕泉,潘敏. 参数调节随机共振增强稳态视觉诱发电位[J]. J4, 2012, 46(5): 918-922.

ZHU Dan-hua, CHEN Da-jing, CHEN Yu-quan, PAN Min. Enhancement of steady-state visual evoked potentials using
parameter-tuned stochastic resonance. J4, 2012, 46(5): 918-922.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2012.05.023        http://www.zjujournals.com/eng/CN/Y2012/V46/I5/918

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