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Chinese Physics, 2006, Vol. 15(1): 100-103    DOI: 10.1088/1009-1963/15/1/016
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A digital filtering scheme for SQUID based magnetocardiography

Zhu Xue-Min (朱学敏), Ren Yu-Feng (任育峰), Yu Hong-Wei (于洪伟), Zhao Shi-Ping (赵士平), Chen Geng-Hua (陈赓华), Zhang Li-Hua (张利华), Yang Qian-Sheng (杨乾声)
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract  Considering the properties of slow change and quasi-periodicity of magnetocardiography (MCG) signal, we use an integrated technique of adaptive and low-pass filtering in dealing with two-channel MCG data measured by high $T_{\rm c}$ SQUIDs. The adaptive filter in the time domain is based on a noise feedback normalized least-mean-square (NLMS) algorithm, and the low-pass filter with a cutoff at 100Hz in the frequency domain characterized by Gaussian functions is combined with a notch at the power line frequency. In this way, both relevant and irrelevant noises in original MCG data are largely eliminated. The method may also be useful for other slowly varying quasi-periodical signals.
Keywords:  SQUIDs      adaptive filter      magnetocardiography  
Received:  26 May 2005      Revised:  01 September 2005      Accepted manuscript online: 
PACS:  87.80.-y (Biophysical techniques (research methods))  
  87.19.Hh (Cardiac dynamics)  
  85.25.Dq (Superconducting quantum interference devices (SQUIDs))  
  07.55.-w (Magnetic instruments and components)  
  02.70.Rr (General statistical methods)  
Fund: Project supported by the Major Program for the Fundamental Research of Chinese Academy of Sciences, China (Grant No KJCX2-W4) and the National High Technology Research and Development Program of China (Grant No 2002AA306412).

Cite this article: 

Zhu Xue-Min (朱学敏), Ren Yu-Feng (任育峰), Yu Hong-Wei (于洪伟), Zhao Shi-Ping (赵士平), Chen Geng-Hua (陈赓华), Zhang Li-Hua (张利华), Yang Qian-Sheng (杨乾声) A digital filtering scheme for SQUID based magnetocardiography 2006 Chinese Physics 15 100

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